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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

  2. <html>

  3. <!-- Created by GNU Texinfo 6.8, https://www.gnu.org/software/texinfo/ -->

  4.   <head>

  5.     <meta charset="utf-8">

  6.     <title>

  7.       ffplay Documentation

  8.     </title>

  9.     <meta name="viewport" content="width=device-width,initial-scale=1.0">

  10.     <link rel="stylesheet" type="text/css" href="bootstrap.min.css">

  11.     <link rel="stylesheet" type="text/css" href="style.min.css">

  12.   </head>

  13.   <body>

  14.     <div class="container">

  15.       <h1>

  16.       ffplay Documentation

  17.       </h1>

  18. <div align="center">

  19. </div>

  20. 

  21. 

  22. <a name="SEC_Top"></a>

  23. 

  24. <div class="Contents_element" id="SEC_Contents">

  25. <h2 class="contents-heading">Table of Contents</h2>

  26. 

  27. <div class="contents">

  28. 

  29. <ul class="no-bullet">

  30.   <li><a id="toc-Synopsis" href="#Synopsis">1 Synopsis</a></li>

  31.   <li><a id="toc-Description" href="#Description">2 Description</a></li>

  32.   <li><a id="toc-Options" href="#Options">3 Options</a>

  33.   <ul class="no-bullet">

  34.     <li><a id="toc-Stream-specifiers-1" href="#Stream-specifiers-1">3.1 Stream specifiers</a></li>

  35.     <li><a id="toc-Generic-options" href="#Generic-options">3.2 Generic options</a></li>

  36.     <li><a id="toc-AVOptions" href="#AVOptions">3.3 AVOptions</a></li>

  37.     <li><a id="toc-Main-options" href="#Main-options">3.4 Main options</a></li>

  38.     <li><a id="toc-Advanced-options" href="#Advanced-options">3.5 Advanced options</a></li>

  39.     <li><a id="toc-While-playing" href="#While-playing">3.6 While playing</a></li>

  40.   </ul></li>

  41.   <li><a id="toc-See-Also" href="#See-Also">4 See Also</a></li>

  42.   <li><a id="toc-Authors" href="#Authors">5 Authors</a></li>

  43. </ul>

  44. </div>

  45. </div>

  46. 

  47. <a name="Synopsis"></a>

  48. <h2 class="chapter">1 Synopsis<span class="pull-right"><a class="anchor hidden-xs" href="#Synopsis" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Synopsis" aria-hidden="true">TOC</a></span></h2>

  49. 

  50. <p>ffplay [<var>options</var>] [<samp>input_url</samp>]

  51. </p>

  52. <a name="Description"></a>

  53. <h2 class="chapter">2 Description<span class="pull-right"><a class="anchor hidden-xs" href="#Description" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Description" aria-hidden="true">TOC</a></span></h2>

  54. 

  55. <p>FFplay is a very simple and portable media player using the FFmpeg

  56. libraries and the SDL library. It is mostly used as a testbed for the

  57. various FFmpeg APIs.

  58. </p>

  59. <a name="Options"></a>

  60. <h2 class="chapter">3 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options" aria-hidden="true">TOC</a></span></h2>

  61. 

  62. <p>All the numerical options, if not specified otherwise, accept a string

  63. representing a number as input, which may be followed by one of the SI

  64. unit prefixes, for example: &rsquo;K&rsquo;, &rsquo;M&rsquo;, or &rsquo;G&rsquo;.

  65. </p>

  66. <p>If &rsquo;i&rsquo; is appended to the SI unit prefix, the complete prefix will be

  67. interpreted as a unit prefix for binary multiples, which are based on

  68. powers of 1024 instead of powers of 1000. Appending &rsquo;B&rsquo; to the SI unit

  69. prefix multiplies the value by 8. This allows using, for example:

  70. &rsquo;KB&rsquo;, &rsquo;MiB&rsquo;, &rsquo;G&rsquo; and &rsquo;B&rsquo; as number suffixes.

  71. </p>

  72. <p>Options which do not take arguments are boolean options, and set the

  73. corresponding value to true. They can be set to false by prefixing

  74. the option name with &quot;no&quot;. For example using &quot;-nofoo&quot;

  75. will set the boolean option with name &quot;foo&quot; to false.

  76. </p>

  77. <span id="Stream-specifiers"></span><a name="Stream-specifiers-1"></a>

  78. <h3 class="section">3.1 Stream specifiers<span class="pull-right"><a class="anchor hidden-xs" href="#Stream-specifiers-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Stream-specifiers-1" aria-hidden="true">TOC</a></span></h3>

  79. <p>Some options are applied per-stream, e.g. bitrate or codec. Stream specifiers

  80. are used to precisely specify which stream(s) a given option belongs to.

  81. </p>

  82. <p>A stream specifier is a string generally appended to the option name and

  83. separated from it by a colon. E.g. <code>-codec:a:1 ac3</code> contains the

  84. <code>a:1</code> stream specifier, which matches the second audio stream. Therefore, it

  85. would select the ac3 codec for the second audio stream.

  86. </p>

  87. <p>A stream specifier can match several streams, so that the option is applied to all

  88. of them. E.g. the stream specifier in <code>-b:a 128k</code> matches all audio

  89. streams.

  90. </p>

  91. <p>An empty stream specifier matches all streams. For example, <code>-codec copy</code>

  92. or <code>-codec: copy</code> would copy all the streams without reencoding.

  93. </p>

  94. <p>Possible forms of stream specifiers are:

  95. </p><dl compact="compact">

  96. <dt><span><samp><var>stream_index</var></samp></span></dt>

  97. <dd><p>Matches the stream with this index. E.g. <code>-threads:1 4</code> would set the

  98. thread count for the second stream to 4. If <var>stream_index</var> is used as an

  99. additional stream specifier (see below), then it selects stream number

  100. <var>stream_index</var> from the matching streams. Stream numbering is based on the

  101. order of the streams as detected by libavformat except when a program ID is

  102. also specified. In this case it is based on the ordering of the streams in the

  103. program.

  104. </p></dd>

  105. <dt><span><samp><var>stream_type</var>[:<var>additional_stream_specifier</var>]</samp></span></dt>

  106. <dd><p><var>stream_type</var> is one of following: &rsquo;v&rsquo; or &rsquo;V&rsquo; for video, &rsquo;a&rsquo; for audio, &rsquo;s&rsquo;

  107. for subtitle, &rsquo;d&rsquo; for data, and &rsquo;t&rsquo; for attachments. &rsquo;v&rsquo; matches all video

  108. streams, &rsquo;V&rsquo; only matches video streams which are not attached pictures, video

  109. thumbnails or cover arts. If <var>additional_stream_specifier</var> is used, then

  110. it matches streams which both have this type and match the

  111. <var>additional_stream_specifier</var>. Otherwise, it matches all streams of the

  112. specified type.

  113. </p></dd>

  114. <dt><span><samp>p:<var>program_id</var>[:<var>additional_stream_specifier</var>]</samp></span></dt>

  115. <dd><p>Matches streams which are in the program with the id <var>program_id</var>. If

  116. <var>additional_stream_specifier</var> is used, then it matches streams which both

  117. are part of the program and match the <var>additional_stream_specifier</var>.

  118. </p>

  119. </dd>

  120. <dt><span><samp>#<var>stream_id</var> or i:<var>stream_id</var></samp></span></dt>

  121. <dd><p>Match the stream by stream id (e.g. PID in MPEG-TS container).

  122. </p></dd>

  123. <dt><span><samp>m:<var>key</var>[:<var>value</var>]</samp></span></dt>

  124. <dd><p>Matches streams with the metadata tag <var>key</var> having the specified value. If

  125. <var>value</var> is not given, matches streams that contain the given tag with any

  126. value.

  127. </p></dd>

  128. <dt><span><samp>u</samp></span></dt>

  129. <dd><p>Matches streams with usable configuration, the codec must be defined and the

  130. essential information such as video dimension or audio sample rate must be present.

  131. </p>

  132. <p>Note that in <code>ffmpeg</code>, matching by metadata will only work properly for

  133. input files.

  134. </p></dd>

  135. </dl>

  136. 

  137. <a name="Generic-options"></a>

  138. <h3 class="section">3.2 Generic options<span class="pull-right"><a class="anchor hidden-xs" href="#Generic-options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Generic-options" aria-hidden="true">TOC</a></span></h3>

  139. 

  140. <p>These options are shared amongst the ff* tools.

  141. </p>

  142. <dl compact="compact">

  143. <dt><span><samp>-L</samp></span></dt>

  144. <dd><p>Show license.

  145. </p>

  146. </dd>

  147. <dt><span><samp>-h, -?, -help, --help [<var>arg</var>]</samp></span></dt>

  148. <dd><p>Show help. An optional parameter may be specified to print help about a specific

  149. item. If no argument is specified, only basic (non advanced) tool

  150. options are shown.

  151. </p>

  152. <p>Possible values of <var>arg</var> are:

  153. </p><dl compact="compact">

  154. <dt><span><samp>long</samp></span></dt>

  155. <dd><p>Print advanced tool options in addition to the basic tool options.

  156. </p>

  157. </dd>

  158. <dt><span><samp>full</samp></span></dt>

  159. <dd><p>Print complete list of options, including shared and private options

  160. for encoders, decoders, demuxers, muxers, filters, etc.

  161. </p>

  162. </dd>

  163. <dt><span><samp>decoder=<var>decoder_name</var></samp></span></dt>

  164. <dd><p>Print detailed information about the decoder named <var>decoder_name</var>. Use the

  165. <samp>-decoders</samp> option to get a list of all decoders.

  166. </p>

  167. </dd>

  168. <dt><span><samp>encoder=<var>encoder_name</var></samp></span></dt>

  169. <dd><p>Print detailed information about the encoder named <var>encoder_name</var>. Use the

  170. <samp>-encoders</samp> option to get a list of all encoders.

  171. </p>

  172. </dd>

  173. <dt><span><samp>demuxer=<var>demuxer_name</var></samp></span></dt>

  174. <dd><p>Print detailed information about the demuxer named <var>demuxer_name</var>. Use the

  175. <samp>-formats</samp> option to get a list of all demuxers and muxers.

  176. </p>

  177. </dd>

  178. <dt><span><samp>muxer=<var>muxer_name</var></samp></span></dt>

  179. <dd><p>Print detailed information about the muxer named <var>muxer_name</var>. Use the

  180. <samp>-formats</samp> option to get a list of all muxers and demuxers.

  181. </p>

  182. </dd>

  183. <dt><span><samp>filter=<var>filter_name</var></samp></span></dt>

  184. <dd><p>Print detailed information about the filter named <var>filter_name</var>. Use the

  185. <samp>-filters</samp> option to get a list of all filters.

  186. </p>

  187. </dd>

  188. <dt><span><samp>bsf=<var>bitstream_filter_name</var></samp></span></dt>

  189. <dd><p>Print detailed information about the bitstream filter named <var>bitstream_filter_name</var>.

  190. Use the <samp>-bsfs</samp> option to get a list of all bitstream filters.

  191. </p>

  192. </dd>

  193. <dt><span><samp>protocol=<var>protocol_name</var></samp></span></dt>

  194. <dd><p>Print detailed information about the protocol named <var>protocol_name</var>.

  195. Use the <samp>-protocols</samp> option to get a list of all protocols.

  196. </p></dd>

  197. </dl>

  198. 

  199. </dd>

  200. <dt><span><samp>-version</samp></span></dt>

  201. <dd><p>Show version.

  202. </p>

  203. </dd>

  204. <dt><span><samp>-buildconf</samp></span></dt>

  205. <dd><p>Show the build configuration, one option per line.

  206. </p>

  207. </dd>

  208. <dt><span><samp>-formats</samp></span></dt>

  209. <dd><p>Show available formats (including devices).

  210. </p>

  211. </dd>

  212. <dt><span><samp>-demuxers</samp></span></dt>

  213. <dd><p>Show available demuxers.

  214. </p>

  215. </dd>

  216. <dt><span><samp>-muxers</samp></span></dt>

  217. <dd><p>Show available muxers.

  218. </p>

  219. </dd>

  220. <dt><span><samp>-devices</samp></span></dt>

  221. <dd><p>Show available devices.

  222. </p>

  223. </dd>

  224. <dt><span><samp>-codecs</samp></span></dt>

  225. <dd><p>Show all codecs known to libavcodec.

  226. </p>

  227. <p>Note that the term &rsquo;codec&rsquo; is used throughout this documentation as a shortcut

  228. for what is more correctly called a media bitstream format.

  229. </p>

  230. </dd>

  231. <dt><span><samp>-decoders</samp></span></dt>

  232. <dd><p>Show available decoders.

  233. </p>

  234. </dd>

  235. <dt><span><samp>-encoders</samp></span></dt>

  236. <dd><p>Show all available encoders.

  237. </p>

  238. </dd>

  239. <dt><span><samp>-bsfs</samp></span></dt>

  240. <dd><p>Show available bitstream filters.

  241. </p>

  242. </dd>

  243. <dt><span><samp>-protocols</samp></span></dt>

  244. <dd><p>Show available protocols.

  245. </p>

  246. </dd>

  247. <dt><span><samp>-filters</samp></span></dt>

  248. <dd><p>Show available libavfilter filters.

  249. </p>

  250. </dd>

  251. <dt><span><samp>-pix_fmts</samp></span></dt>

  252. <dd><p>Show available pixel formats.

  253. </p>

  254. </dd>

  255. <dt><span><samp>-sample_fmts</samp></span></dt>

  256. <dd><p>Show available sample formats.

  257. </p>

  258. </dd>

  259. <dt><span><samp>-layouts</samp></span></dt>

  260. <dd><p>Show channel names and standard channel layouts.

  261. </p>

  262. </dd>

  263. <dt><span><samp>-dispositions</samp></span></dt>

  264. <dd><p>Show stream dispositions.

  265. </p>

  266. </dd>

  267. <dt><span><samp>-colors</samp></span></dt>

  268. <dd><p>Show recognized color names.

  269. </p>

  270. </dd>

  271. <dt><span><samp>-sources <var>device</var>[,<var>opt1</var>=<var>val1</var>[,<var>opt2</var>=<var>val2</var>]...]</samp></span></dt>

  272. <dd><p>Show autodetected sources of the input device.

  273. Some devices may provide system-dependent source names that cannot be autodetected.

  274. The returned list cannot be assumed to be always complete.

  275. </p><div class="example">

  276. <pre class="example">ffmpeg -sources pulse,server=192.168.0.4

  277. </pre></div>

  278. 

  279. </dd>

  280. <dt><span><samp>-sinks <var>device</var>[,<var>opt1</var>=<var>val1</var>[,<var>opt2</var>=<var>val2</var>]...]</samp></span></dt>

  281. <dd><p>Show autodetected sinks of the output device.

  282. Some devices may provide system-dependent sink names that cannot be autodetected.

  283. The returned list cannot be assumed to be always complete.

  284. </p><div class="example">

  285. <pre class="example">ffmpeg -sinks pulse,server=192.168.0.4

  286. </pre></div>

  287. 

  288. </dd>

  289. <dt><span><samp>-loglevel [<var>flags</var>+]<var>loglevel</var> | -v [<var>flags</var>+]<var>loglevel</var></samp></span></dt>

  290. <dd><p>Set logging level and flags used by the library.

  291. </p>

  292. <p>The optional <var>flags</var> prefix can consist of the following values:

  293. </p><dl compact="compact">

  294. <dt><span>&lsquo;<samp>repeat</samp>&rsquo;</span></dt>

  295. <dd><p>Indicates that repeated log output should not be compressed to the first line

  296. and the &quot;Last message repeated n times&quot; line will be omitted.

  297. </p></dd>

  298. <dt><span>&lsquo;<samp>level</samp>&rsquo;</span></dt>

  299. <dd><p>Indicates that log output should add a <code>[level]</code> prefix to each message

  300. line. This can be used as an alternative to log coloring, e.g. when dumping the

  301. log to file.

  302. </p></dd>

  303. </dl>

  304. <p>Flags can also be used alone by adding a &rsquo;+&rsquo;/&rsquo;-&rsquo; prefix to set/reset a single

  305. flag without affecting other <var>flags</var> or changing <var>loglevel</var>. When

  306. setting both <var>flags</var> and <var>loglevel</var>, a &rsquo;+&rsquo; separator is expected

  307. between the last <var>flags</var> value and before <var>loglevel</var>.

  308. </p>

  309. <p><var>loglevel</var> is a string or a number containing one of the following values:

  310. </p><dl compact="compact">

  311. <dt><span>&lsquo;<samp>quiet, -8</samp>&rsquo;</span></dt>

  312. <dd><p>Show nothing at all; be silent.

  313. </p></dd>

  314. <dt><span>&lsquo;<samp>panic, 0</samp>&rsquo;</span></dt>

  315. <dd><p>Only show fatal errors which could lead the process to crash, such as

  316. an assertion failure. This is not currently used for anything.

  317. </p></dd>

  318. <dt><span>&lsquo;<samp>fatal, 8</samp>&rsquo;</span></dt>

  319. <dd><p>Only show fatal errors. These are errors after which the process absolutely

  320. cannot continue.

  321. </p></dd>

  322. <dt><span>&lsquo;<samp>error, 16</samp>&rsquo;</span></dt>

  323. <dd><p>Show all errors, including ones which can be recovered from.

  324. </p></dd>

  325. <dt><span>&lsquo;<samp>warning, 24</samp>&rsquo;</span></dt>

  326. <dd><p>Show all warnings and errors. Any message related to possibly

  327. incorrect or unexpected events will be shown.

  328. </p></dd>

  329. <dt><span>&lsquo;<samp>info, 32</samp>&rsquo;</span></dt>

  330. <dd><p>Show informative messages during processing. This is in addition to

  331. warnings and errors. This is the default value.

  332. </p></dd>

  333. <dt><span>&lsquo;<samp>verbose, 40</samp>&rsquo;</span></dt>

  334. <dd><p>Same as <code>info</code>, except more verbose.

  335. </p></dd>

  336. <dt><span>&lsquo;<samp>debug, 48</samp>&rsquo;</span></dt>

  337. <dd><p>Show everything, including debugging information.

  338. </p></dd>

  339. <dt><span>&lsquo;<samp>trace, 56</samp>&rsquo;</span></dt>

  340. </dl>

  341. 

  342. <p>For example to enable repeated log output, add the <code>level</code> prefix, and set

  343. <var>loglevel</var> to <code>verbose</code>:

  344. </p><div class="example">

  345. <pre class="example">ffmpeg -loglevel repeat+level+verbose -i input output

  346. </pre></div>

  347. <p>Another example that enables repeated log output without affecting current

  348. state of <code>level</code> prefix flag or <var>loglevel</var>:

  349. </p><div class="example">

  350. <pre class="example">ffmpeg [...] -loglevel +repeat

  351. </pre></div>

  352. 

  353. <p>By default the program logs to stderr. If coloring is supported by the

  354. terminal, colors are used to mark errors and warnings. Log coloring

  355. can be disabled setting the environment variable

  356. <code>AV_LOG_FORCE_NOCOLOR</code>, or can be forced setting

  357. the environment variable <code>AV_LOG_FORCE_COLOR</code>.

  358. </p>

  359. </dd>

  360. <dt><span><samp>-report</samp></span></dt>

  361. <dd><p>Dump full command line and log output to a file named

  362. <code><var>program</var>-<var>YYYYMMDD</var>-<var>HHMMSS</var>.log</code> in the current

  363. directory.

  364. This file can be useful for bug reports.

  365. It also implies <code>-loglevel debug</code>.

  366. </p>

  367. <p>Setting the environment variable <code>FFREPORT</code> to any value has the

  368. same effect. If the value is a &rsquo;:&rsquo;-separated key=value sequence, these

  369. options will affect the report; option values must be escaped if they

  370. contain special characters or the options delimiter &rsquo;:&rsquo; (see the

  371. &ldquo;Quoting and escaping&rdquo; section in the ffmpeg-utils manual).

  372. </p>

  373. <p>The following options are recognized:

  374. </p><dl compact="compact">

  375. <dt><span><samp>file</samp></span></dt>

  376. <dd><p>set the file name to use for the report; <code>%p</code> is expanded to the name

  377. of the program, <code>%t</code> is expanded to a timestamp, <code>%%</code> is expanded

  378. to a plain <code>%</code>

  379. </p></dd>

  380. <dt><span><samp>level</samp></span></dt>

  381. <dd><p>set the log verbosity level using a numerical value (see <code>-loglevel</code>).

  382. </p></dd>

  383. </dl>

  384. 

  385. <p>For example, to output a report to a file named <samp>ffreport.log</samp>

  386. using a log level of <code>32</code> (alias for log level <code>info</code>):

  387. </p>

  388. <div class="example">

  389. <pre class="example">FFREPORT=file=ffreport.log:level=32 ffmpeg -i input output

  390. </pre></div>

  391. 

  392. <p>Errors in parsing the environment variable are not fatal, and will not

  393. appear in the report.

  394. </p>

  395. </dd>

  396. <dt><span><samp>-hide_banner</samp></span></dt>

  397. <dd><p>Suppress printing banner.

  398. </p>

  399. <p>All FFmpeg tools will normally show a copyright notice, build options

  400. and library versions. This option can be used to suppress printing

  401. this information.

  402. </p>

  403. </dd>

  404. <dt><span><samp>-cpuflags flags (<em>global</em>)</samp></span></dt>

  405. <dd><p>Allows setting and clearing cpu flags. This option is intended

  406. for testing. Do not use it unless you know what you&rsquo;re doing.

  407. </p><div class="example">

  408. <pre class="example">ffmpeg -cpuflags -sse+mmx ...

  409. ffmpeg -cpuflags mmx ...

  410. ffmpeg -cpuflags 0 ...

  411. </pre></div>

  412. <p>Possible flags for this option are:

  413. </p><dl compact="compact">

  414. <dt><span>&lsquo;<samp>x86</samp>&rsquo;</span></dt>

  415. <dd><dl compact="compact">

  416. <dt><span>&lsquo;<samp>mmx</samp>&rsquo;</span></dt>

  417. <dt><span>&lsquo;<samp>mmxext</samp>&rsquo;</span></dt>

  418. <dt><span>&lsquo;<samp>sse</samp>&rsquo;</span></dt>

  419. <dt><span>&lsquo;<samp>sse2</samp>&rsquo;</span></dt>

  420. <dt><span>&lsquo;<samp>sse2slow</samp>&rsquo;</span></dt>

  421. <dt><span>&lsquo;<samp>sse3</samp>&rsquo;</span></dt>

  422. <dt><span>&lsquo;<samp>sse3slow</samp>&rsquo;</span></dt>

  423. <dt><span>&lsquo;<samp>ssse3</samp>&rsquo;</span></dt>

  424. <dt><span>&lsquo;<samp>atom</samp>&rsquo;</span></dt>

  425. <dt><span>&lsquo;<samp>sse4.1</samp>&rsquo;</span></dt>

  426. <dt><span>&lsquo;<samp>sse4.2</samp>&rsquo;</span></dt>

  427. <dt><span>&lsquo;<samp>avx</samp>&rsquo;</span></dt>

  428. <dt><span>&lsquo;<samp>avx2</samp>&rsquo;</span></dt>

  429. <dt><span>&lsquo;<samp>xop</samp>&rsquo;</span></dt>

  430. <dt><span>&lsquo;<samp>fma3</samp>&rsquo;</span></dt>

  431. <dt><span>&lsquo;<samp>fma4</samp>&rsquo;</span></dt>

  432. <dt><span>&lsquo;<samp>3dnow</samp>&rsquo;</span></dt>

  433. <dt><span>&lsquo;<samp>3dnowext</samp>&rsquo;</span></dt>

  434. <dt><span>&lsquo;<samp>bmi1</samp>&rsquo;</span></dt>

  435. <dt><span>&lsquo;<samp>bmi2</samp>&rsquo;</span></dt>

  436. <dt><span>&lsquo;<samp>cmov</samp>&rsquo;</span></dt>

  437. </dl>

  438. </dd>

  439. <dt><span>&lsquo;<samp>ARM</samp>&rsquo;</span></dt>

  440. <dd><dl compact="compact">

  441. <dt><span>&lsquo;<samp>armv5te</samp>&rsquo;</span></dt>

  442. <dt><span>&lsquo;<samp>armv6</samp>&rsquo;</span></dt>

  443. <dt><span>&lsquo;<samp>armv6t2</samp>&rsquo;</span></dt>

  444. <dt><span>&lsquo;<samp>vfp</samp>&rsquo;</span></dt>

  445. <dt><span>&lsquo;<samp>vfpv3</samp>&rsquo;</span></dt>

  446. <dt><span>&lsquo;<samp>neon</samp>&rsquo;</span></dt>

  447. <dt><span>&lsquo;<samp>setend</samp>&rsquo;</span></dt>

  448. </dl>

  449. </dd>

  450. <dt><span>&lsquo;<samp>AArch64</samp>&rsquo;</span></dt>

  451. <dd><dl compact="compact">

  452. <dt><span>&lsquo;<samp>armv8</samp>&rsquo;</span></dt>

  453. <dt><span>&lsquo;<samp>vfp</samp>&rsquo;</span></dt>

  454. <dt><span>&lsquo;<samp>neon</samp>&rsquo;</span></dt>

  455. </dl>

  456. </dd>

  457. <dt><span>&lsquo;<samp>PowerPC</samp>&rsquo;</span></dt>

  458. <dd><dl compact="compact">

  459. <dt><span>&lsquo;<samp>altivec</samp>&rsquo;</span></dt>

  460. </dl>

  461. </dd>

  462. <dt><span>&lsquo;<samp>Specific Processors</samp>&rsquo;</span></dt>

  463. <dd><dl compact="compact">

  464. <dt><span>&lsquo;<samp>pentium2</samp>&rsquo;</span></dt>

  465. <dt><span>&lsquo;<samp>pentium3</samp>&rsquo;</span></dt>

  466. <dt><span>&lsquo;<samp>pentium4</samp>&rsquo;</span></dt>

  467. <dt><span>&lsquo;<samp>k6</samp>&rsquo;</span></dt>

  468. <dt><span>&lsquo;<samp>k62</samp>&rsquo;</span></dt>

  469. <dt><span>&lsquo;<samp>athlon</samp>&rsquo;</span></dt>

  470. <dt><span>&lsquo;<samp>athlonxp</samp>&rsquo;</span></dt>

  471. <dt><span>&lsquo;<samp>k8</samp>&rsquo;</span></dt>

  472. </dl>

  473. </dd>

  474. </dl>

  475. 

  476. </dd>

  477. <dt><span><samp>-cpucount <var>count</var> (<em>global</em>)</samp></span></dt>

  478. <dd><p>Override detection of CPU count. This option is intended

  479. for testing. Do not use it unless you know what you&rsquo;re doing.

  480. </p><div class="example">

  481. <pre class="example">ffmpeg -cpucount 2

  482. </pre></div>

  483. 

  484. </dd>

  485. <dt><span><samp>-max_alloc <var>bytes</var></samp></span></dt>

  486. <dd><p>Set the maximum size limit for allocating a block on the heap by ffmpeg&rsquo;s

  487. family of malloc functions. Exercise <strong>extreme caution</strong> when using

  488. this option. Don&rsquo;t use if you do not understand the full consequence of doing so.

  489. Default is INT_MAX.

  490. </p></dd>

  491. </dl>

  492. 

  493. <a name="AVOptions"></a>

  494. <h3 class="section">3.3 AVOptions<span class="pull-right"><a class="anchor hidden-xs" href="#AVOptions" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-AVOptions" aria-hidden="true">TOC</a></span></h3>

  495. 

  496. <p>These options are provided directly by the libavformat, libavdevice and

  497. libavcodec libraries. To see the list of available AVOptions, use the

  498. <samp>-help</samp> option. They are separated into two categories:

  499. </p><dl compact="compact">

  500. <dt><span><samp>generic</samp></span></dt>

  501. <dd><p>These options can be set for any container, codec or device. Generic options

  502. are listed under AVFormatContext options for containers/devices and under

  503. AVCodecContext options for codecs.

  504. </p></dd>

  505. <dt><span><samp>private</samp></span></dt>

  506. <dd><p>These options are specific to the given container, device or codec. Private

  507. options are listed under their corresponding containers/devices/codecs.

  508. </p></dd>

  509. </dl>

  510. 

  511. <p>For example to write an ID3v2.3 header instead of a default ID3v2.4 to

  512. an MP3 file, use the <samp>id3v2_version</samp> private option of the MP3

  513. muxer:

  514. </p><div class="example">

  515. <pre class="example">ffmpeg -i input.flac -id3v2_version 3 out.mp3

  516. </pre></div>

  517. 

  518. <p>All codec AVOptions are per-stream, and thus a stream specifier

  519. should be attached to them:

  520. </p><div class="example">

  521. <pre class="example">ffmpeg -i multichannel.mxf -map 0:v:0 -map 0:a:0 -map 0:a:0 -c:a:0 ac3 -b:a:0 640k -ac:a:1 2 -c:a:1 aac -b:2 128k out.mp4

  522. </pre></div>

  523. 

  524. <p>In the above example, a multichannel audio stream is mapped twice for output.

  525. The first instance is encoded with codec ac3 and bitrate 640k.

  526. The second instance is downmixed to 2 channels and encoded with codec aac. A bitrate of 128k is specified for it using

  527. absolute index of the output stream.

  528. </p>

  529. <p>Note: the <samp>-nooption</samp> syntax cannot be used for boolean

  530. AVOptions, use <samp>-option 0</samp>/<samp>-option 1</samp>.

  531. </p>

  532. <p>Note: the old undocumented way of specifying per-stream AVOptions by

  533. prepending v/a/s to the options name is now obsolete and will be

  534. removed soon.

  535. </p>

  536. <a name="Main-options"></a>

  537. <h3 class="section">3.4 Main options<span class="pull-right"><a class="anchor hidden-xs" href="#Main-options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Main-options" aria-hidden="true">TOC</a></span></h3>

  538. 

  539. <dl compact="compact">

  540. <dt><span><samp>-x <var>width</var></samp></span></dt>

  541. <dd><p>Force displayed width.

  542. </p></dd>

  543. <dt><span><samp>-y <var>height</var></samp></span></dt>

  544. <dd><p>Force displayed height.

  545. </p></dd>

  546. <dt><span><samp>-fs</samp></span></dt>

  547. <dd><p>Start in fullscreen mode.

  548. </p></dd>

  549. <dt><span><samp>-an</samp></span></dt>

  550. <dd><p>Disable audio.

  551. </p></dd>

  552. <dt><span><samp>-vn</samp></span></dt>

  553. <dd><p>Disable video.

  554. </p></dd>

  555. <dt><span><samp>-sn</samp></span></dt>

  556. <dd><p>Disable subtitles.

  557. </p></dd>

  558. <dt><span><samp>-ss <var>pos</var></samp></span></dt>

  559. <dd><p>Seek to <var>pos</var>. Note that in most formats it is not possible to seek

  560. exactly, so <code>ffplay</code> will seek to the nearest seek point to

  561. <var>pos</var>.

  562. </p>

  563. <p><var>pos</var> must be a time duration specification,

  564. see <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">(ffmpeg-utils)the Time duration section in the ffmpeg-utils(1) manual</a>.

  565. </p></dd>

  566. <dt><span><samp>-t <var>duration</var></samp></span></dt>

  567. <dd><p>Play <var>duration</var> seconds of audio/video.

  568. </p>

  569. <p><var>duration</var> must be a time duration specification,

  570. see <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">(ffmpeg-utils)the Time duration section in the ffmpeg-utils(1) manual</a>.

  571. </p></dd>

  572. <dt><span><samp>-bytes</samp></span></dt>

  573. <dd><p>Seek by bytes.

  574. </p></dd>

  575. <dt><span><samp>-seek_interval</samp></span></dt>

  576. <dd><p>Set custom interval, in seconds, for seeking using left/right keys. Default is 10 seconds.

  577. </p></dd>

  578. <dt><span><samp>-nodisp</samp></span></dt>

  579. <dd><p>Disable graphical display.

  580. </p></dd>

  581. <dt><span><samp>-noborder</samp></span></dt>

  582. <dd><p>Borderless window.

  583. </p></dd>

  584. <dt><span><samp>-alwaysontop</samp></span></dt>

  585. <dd><p>Window always on top. Available on: X11 with SDL &gt;= 2.0.5, Windows SDL &gt;= 2.0.6.

  586. </p></dd>

  587. <dt><span><samp>-volume</samp></span></dt>

  588. <dd><p>Set the startup volume. 0 means silence, 100 means no volume reduction or

  589. amplification. Negative values are treated as 0, values above 100 are treated

  590. as 100.

  591. </p></dd>

  592. <dt><span><samp>-f <var>fmt</var></samp></span></dt>

  593. <dd><p>Force format.

  594. </p></dd>

  595. <dt><span><samp>-window_title <var>title</var></samp></span></dt>

  596. <dd><p>Set window title (default is the input filename).

  597. </p></dd>

  598. <dt><span><samp>-left <var>title</var></samp></span></dt>

  599. <dd><p>Set the x position for the left of the window (default is a centered window).

  600. </p></dd>

  601. <dt><span><samp>-top <var>title</var></samp></span></dt>

  602. <dd><p>Set the y position for the top of the window (default is a centered window).

  603. </p></dd>

  604. <dt><span><samp>-loop <var>number</var></samp></span></dt>

  605. <dd><p>Loops movie playback &lt;number&gt; times. 0 means forever.

  606. </p></dd>

  607. <dt><span><samp>-showmode <var>mode</var></samp></span></dt>

  608. <dd><p>Set the show mode to use.

  609. Available values for <var>mode</var> are:

  610. </p><dl compact="compact">

  611. <dt><span>&lsquo;<samp>0, video</samp>&rsquo;</span></dt>

  612. <dd><p>show video

  613. </p></dd>

  614. <dt><span>&lsquo;<samp>1, waves</samp>&rsquo;</span></dt>

  615. <dd><p>show audio waves

  616. </p></dd>

  617. <dt><span>&lsquo;<samp>2, rdft</samp>&rsquo;</span></dt>

  618. <dd><p>show audio frequency band using RDFT ((Inverse) Real Discrete Fourier Transform)

  619. </p></dd>

  620. </dl>

  621. 

  622. <p>Default value is &quot;video&quot;, if video is not present or cannot be played

  623. &quot;rdft&quot; is automatically selected.

  624. </p>

  625. <p>You can interactively cycle through the available show modes by

  626. pressing the key <tt class="key">w</tt>.

  627. </p>

  628. </dd>

  629. <dt><span><samp>-vf <var>filtergraph</var></samp></span></dt>

  630. <dd><p>Create the filtergraph specified by <var>filtergraph</var> and use it to

  631. filter the video stream.

  632. </p>

  633. <p><var>filtergraph</var> is a description of the filtergraph to apply to

  634. the stream, and must have a single video input and a single video

  635. output. In the filtergraph, the input is associated to the label

  636. <code>in</code>, and the output to the label <code>out</code>. See the

  637. ffmpeg-filters manual for more information about the filtergraph

  638. syntax.

  639. </p>

  640. <p>You can specify this parameter multiple times and cycle through the specified

  641. filtergraphs along with the show modes by pressing the key <tt class="key">w</tt>.

  642. </p>

  643. </dd>

  644. <dt><span><samp>-af <var>filtergraph</var></samp></span></dt>

  645. <dd><p><var>filtergraph</var> is a description of the filtergraph to apply to

  646. the input audio.

  647. Use the option &quot;-filters&quot; to show all the available filters (including

  648. sources and sinks).

  649. </p>

  650. </dd>

  651. <dt><span><samp>-i <var>input_url</var></samp></span></dt>

  652. <dd><p>Read <var>input_url</var>.

  653. </p></dd>

  654. </dl>

  655. 

  656. <a name="Advanced-options"></a>

  657. <h3 class="section">3.5 Advanced options<span class="pull-right"><a class="anchor hidden-xs" href="#Advanced-options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Advanced-options" aria-hidden="true">TOC</a></span></h3>

  658. <dl compact="compact">

  659. <dt><span><samp>-stats</samp></span></dt>

  660. <dd><p>Print several playback statistics, in particular show the stream

  661. duration, the codec parameters, the current position in the stream and

  662. the audio/video synchronisation drift. It is shown by default, unless the

  663. log level is lower than <code>info</code>. Its display can be forced by manually

  664. specifying this option. To disable it, you need to specify <code>-nostats</code>.

  665. </p>

  666. </dd>

  667. <dt><span><samp>-fast</samp></span></dt>

  668. <dd><p>Non-spec-compliant optimizations.

  669. </p></dd>

  670. <dt><span><samp>-genpts</samp></span></dt>

  671. <dd><p>Generate pts.

  672. </p></dd>

  673. <dt><span><samp>-sync <var>type</var></samp></span></dt>

  674. <dd><p>Set the master clock to audio (<code>type=audio</code>), video

  675. (<code>type=video</code>) or external (<code>type=ext</code>). Default is audio. The

  676. master clock is used to control audio-video synchronization. Most media

  677. players use audio as master clock, but in some cases (streaming or high

  678. quality broadcast) it is necessary to change that. This option is mainly

  679. used for debugging purposes.

  680. </p></dd>

  681. <dt><span><samp>-ast <var>audio_stream_specifier</var></samp></span></dt>

  682. <dd><p>Select the desired audio stream using the given stream specifier. The stream

  683. specifiers are described in the <a href="#Stream-specifiers">Stream specifiers</a> chapter. If this option

  684. is not specified, the &quot;best&quot; audio stream is selected in the program of the

  685. already selected video stream.

  686. </p></dd>

  687. <dt><span><samp>-vst <var>video_stream_specifier</var></samp></span></dt>

  688. <dd><p>Select the desired video stream using the given stream specifier. The stream

  689. specifiers are described in the <a href="#Stream-specifiers">Stream specifiers</a> chapter. If this option

  690. is not specified, the &quot;best&quot; video stream is selected.

  691. </p></dd>

  692. <dt><span><samp>-sst <var>subtitle_stream_specifier</var></samp></span></dt>

  693. <dd><p>Select the desired subtitle stream using the given stream specifier. The stream

  694. specifiers are described in the <a href="#Stream-specifiers">Stream specifiers</a> chapter. If this option

  695. is not specified, the &quot;best&quot; subtitle stream is selected in the program of the

  696. already selected video or audio stream.

  697. </p></dd>

  698. <dt><span><samp>-autoexit</samp></span></dt>

  699. <dd><p>Exit when video is done playing.

  700. </p></dd>

  701. <dt><span><samp>-exitonkeydown</samp></span></dt>

  702. <dd><p>Exit if any key is pressed.

  703. </p></dd>

  704. <dt><span><samp>-exitonmousedown</samp></span></dt>

  705. <dd><p>Exit if any mouse button is pressed.

  706. </p>

  707. </dd>

  708. <dt><span><samp>-codec:<var>media_specifier</var> <var>codec_name</var></samp></span></dt>

  709. <dd><p>Force a specific decoder implementation for the stream identified by

  710. <var>media_specifier</var>, which can assume the values <code>a</code> (audio),

  711. <code>v</code> (video), and <code>s</code> subtitle.

  712. </p>

  713. </dd>

  714. <dt><span><samp>-acodec <var>codec_name</var></samp></span></dt>

  715. <dd><p>Force a specific audio decoder.

  716. </p>

  717. </dd>

  718. <dt><span><samp>-vcodec <var>codec_name</var></samp></span></dt>

  719. <dd><p>Force a specific video decoder.

  720. </p>

  721. </dd>

  722. <dt><span><samp>-scodec <var>codec_name</var></samp></span></dt>

  723. <dd><p>Force a specific subtitle decoder.

  724. </p>

  725. </dd>

  726. <dt><span><samp>-autorotate</samp></span></dt>

  727. <dd><p>Automatically rotate the video according to file metadata. Enabled by

  728. default, use <samp>-noautorotate</samp> to disable it.

  729. </p>

  730. </dd>

  731. <dt><span><samp>-framedrop</samp></span></dt>

  732. <dd><p>Drop video frames if video is out of sync. Enabled by default if the master

  733. clock is not set to video. Use this option to enable frame dropping for all

  734. master clock sources, use <samp>-noframedrop</samp> to disable it.

  735. </p>

  736. </dd>

  737. <dt><span><samp>-infbuf</samp></span></dt>

  738. <dd><p>Do not limit the input buffer size, read as much data as possible from the

  739. input as soon as possible. Enabled by default for realtime streams, where data

  740. may be dropped if not read in time. Use this option to enable infinite buffers

  741. for all inputs, use <samp>-noinfbuf</samp> to disable it.

  742. </p>

  743. </dd>

  744. <dt><span><samp>-filter_threads <var>nb_threads</var></samp></span></dt>

  745. <dd><p>Defines how many threads are used to process a filter pipeline. Each pipeline

  746. will produce a thread pool with this many threads available for parallel

  747. processing. The default is 0 which means that the thread count will be

  748. determined by the number of available CPUs.

  749. </p>

  750. </dd>

  751. </dl>

  752. 

  753. <a name="While-playing"></a>

  754. <h3 class="section">3.6 While playing<span class="pull-right"><a class="anchor hidden-xs" href="#While-playing" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-While-playing" aria-hidden="true">TOC</a></span></h3>

  755. 

  756. <dl compact="compact">

  757. <dt><span><tt class="key">q, ESC</tt></span></dt>

  758. <dd><p>Quit.

  759. </p>

  760. </dd>

  761. <dt><span><tt class="key">f</tt></span></dt>

  762. <dd><p>Toggle full screen.

  763. </p>

  764. </dd>

  765. <dt><span><tt class="key">p, SPC</tt></span></dt>

  766. <dd><p>Pause.

  767. </p>

  768. </dd>

  769. <dt><span><tt class="key">m</tt></span></dt>

  770. <dd><p>Toggle mute.

  771. </p>

  772. </dd>

  773. <dt><span><tt class="key">9, 0</tt></span></dt>

  774. <dt><span><tt class="key">/, *</tt></span></dt>

  775. <dd><p>Decrease and increase volume respectively.

  776. </p>

  777. </dd>

  778. <dt><span><tt class="key">a</tt></span></dt>

  779. <dd><p>Cycle audio channel in the current program.

  780. </p>

  781. </dd>

  782. <dt><span><tt class="key">v</tt></span></dt>

  783. <dd><p>Cycle video channel.

  784. </p>

  785. </dd>

  786. <dt><span><tt class="key">t</tt></span></dt>

  787. <dd><p>Cycle subtitle channel in the current program.

  788. </p>

  789. </dd>

  790. <dt><span><tt class="key">c</tt></span></dt>

  791. <dd><p>Cycle program.

  792. </p>

  793. </dd>

  794. <dt><span><tt class="key">w</tt></span></dt>

  795. <dd><p>Cycle video filters or show modes.

  796. </p>

  797. </dd>

  798. <dt><span><tt class="key">s</tt></span></dt>

  799. <dd><p>Step to the next frame.

  800. </p>

  801. <p>Pause if the stream is not already paused, step to the next video

  802. frame, and pause.

  803. </p>

  804. </dd>

  805. <dt><span><tt class="key">left/right</tt></span></dt>

  806. <dd><p>Seek backward/forward 10 seconds.

  807. </p>

  808. </dd>

  809. <dt><span><tt class="key">down/up</tt></span></dt>

  810. <dd><p>Seek backward/forward 1 minute.

  811. </p>

  812. </dd>

  813. <dt><span><tt class="key">page down/page up</tt></span></dt>

  814. <dd><p>Seek to the previous/next chapter.

  815. or if there are no chapters

  816. Seek backward/forward 10 minutes.

  817. </p>

  818. </dd>

  819. <dt><span><tt class="key">right mouse click</tt></span></dt>

  820. <dd><p>Seek to percentage in file corresponding to fraction of width.

  821. </p>

  822. </dd>

  823. <dt><span><tt class="key">left mouse double-click</tt></span></dt>

  824. <dd><p>Toggle full screen.

  825. </p>

  826. </dd>

  827. </dl>

  828. 

  829. 

  830. 

  831. <a name="See-Also"></a>

  832. <h2 class="chapter">4 See Also<span class="pull-right"><a class="anchor hidden-xs" href="#See-Also" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-See-Also" aria-hidden="true">TOC</a></span></h2>

  833. 

  834. <p><a href="ffplay-all.html">ffmpeg-all</a>,

  835. <a href="ffmpeg.html">ffmpeg</a>, <a href="ffprobe.html">ffprobe</a>,

  836. <a href="ffmpeg-utils.html">ffmpeg-utils</a>,

  837. <a href="ffmpeg-scaler.html">ffmpeg-scaler</a>,

  838. <a href="ffmpeg-resampler.html">ffmpeg-resampler</a>,

  839. <a href="ffmpeg-codecs.html">ffmpeg-codecs</a>,

  840. <a href="ffmpeg-bitstream-filters.html">ffmpeg-bitstream-filters</a>,

  841. <a href="ffmpeg-formats.html">ffmpeg-formats</a>,

  842. <a href="ffmpeg-devices.html">ffmpeg-devices</a>,

  843. <a href="ffmpeg-protocols.html">ffmpeg-protocols</a>,

  844. <a href="ffmpeg-filters.html">ffmpeg-filters</a>

  845. </p>

  846. 

  847. <a name="Authors"></a>

  848. <h2 class="chapter">5 Authors<span class="pull-right"><a class="anchor hidden-xs" href="#Authors" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Authors" aria-hidden="true">TOC</a></span></h2>

  849. 

  850. <p>The FFmpeg developers.

  851. </p>

  852. <p>For details about the authorship, see the Git history of the project

  853. (https://git.ffmpeg.org/ffmpeg), e.g. by typing the command

  854. <code>git log</code> in the FFmpeg source directory, or browsing the

  855. online repository at <a href="https://git.ffmpeg.org/ffmpeg">https://git.ffmpeg.org/ffmpeg</a>.

  856. </p>

  857. <p>Maintainers for the specific components are listed in the file

  858. <samp>MAINTAINERS</samp> in the source code tree.

  859. </p>

  860. 

  861.       <p style="font-size: small;">

  862.         This document was generated using <a href="https://www.gnu.org/software/texinfo/"><em>makeinfo</em></a>.

  863.       </p>

  864.     </div>

  865.   </body>

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