source: multimedia/videoutils/ffmpeg.xml@ 730a1810

10.0 10.1 11.0 11.1 11.2 11.3 12.0 12.1 7.10 7.9 8.0 8.1 8.2 8.3 8.4 9.0 9.1 basic bdubbs/svn elogind kea ken/TL2024 ken/inkscape-core-mods ken/tuningfonts lazarus lxqt nosym perl-modules plabs/newcss plabs/python-mods python3.11 qt5new rahul/power-profiles-daemon renodr/vulkan-addition trunk upgradedb xry111/intltool xry111/llvm18 xry111/soup3 xry111/test-20220226 xry111/xf86-video-removal
Last change on this file since 730a1810 was 730a1810, checked in by Bruce Dubbs <bdubbs@…>, 8 years ago

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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../../general.ent">
5 %general-entities;
6
7 <!ENTITY ffmpeg-download-http "http://ffmpeg.org/releases/ffmpeg-&ffmpeg-version;.tar.xz">
8 <!ENTITY ffmpeg-download-ftp " ">
9 <!ENTITY ffmpeg-md5sum "0cff5dae51375f0a31a651f986ed1534">
10 <!ENTITY ffmpeg-size "6.9 MB">
11 <!ENTITY ffmpeg-buildsize "156 MB (additional 2450 MB for the FATE suite
12 and 2251 MB for the documentation, making a total of 4.8 GB for the complete
13 build of this page)">
14 <!ENTITY ffmpeg-time "1.3 SBU, with -j4 (additional 3.1 SBU, with
15 THREADS=4, to run the FATE suite, after sample files are downloaded)">
16]>
17
18<sect1 id="ffmpeg" xreflabel="FFmpeg-&ffmpeg-version;">
19 <?dbhtml filename="ffmpeg.html"?>
20
21 <sect1info>
22 <othername>$LastChangedBy$</othername>
23 <date>$Date$</date>
24 </sect1info>
25
26 <title>FFmpeg-&ffmpeg-version;</title>
27
28 <indexterm zone="ffmpeg">
29 <primary sortas="a-FFmpeg">FFmpeg</primary>
30 </indexterm>
31
32 <sect2 role="package">
33 <title>Introduction to FFmpeg</title>
34
35 <para>
36 <application>FFmpeg</application> is a solution to record, convert and
37 stream audio and video. It is a very fast video and audio converter and it
38 can also acquire from a live audio/video source. Designed to be intuitive,
39 the command-line interface (<command>ffmpeg</command>) tries to figure out
40 all the parameters, when possible. <application>FFmpeg</application> can
41 also convert from any sample rate to any other, and resize video on the
42 fly with a high quality polyphase filter.
43 <application>FFmpeg</application> can use a Video4Linux compatible video
44 source and any Open Sound System audio source.
45 </para>
46
47 &lfs79_checked;
48
49 <bridgehead renderas="sect3">Package Information</bridgehead>
50 <itemizedlist spacing="compact">
51 <listitem>
52 <para>
53 Download (HTTP): <ulink url="&ffmpeg-download-http;"/>
54 </para>
55 </listitem>
56 <listitem>
57 <para>
58 Download (FTP): <ulink url="&ffmpeg-download-ftp;"/>
59 </para>
60 </listitem>
61 <listitem>
62 <para>
63 Download MD5 sum: &ffmpeg-md5sum;
64 </para>
65 </listitem>
66 <listitem>
67 <para>
68 Download size: &ffmpeg-size;
69 </para>
70 </listitem>
71 <listitem>
72 <para>
73 Estimated disk space required: &ffmpeg-buildsize;
74 </para>
75 </listitem>
76 <listitem>
77 <para>
78 Estimated build time: &ffmpeg-time;
79 </para>
80 </listitem>
81 </itemizedlist>
82
83 <bridgehead renderas="sect3">FFmpeg Dependencies</bridgehead>
84
85 <bridgehead renderas="sect4">Recommended</bridgehead>
86 <para role="recommended">
87 <xref linkend="libass"/>,
88 <xref linkend="fdk-aac"/>,
89 <xref linkend="freetype2"/>,
90 <xref linkend="lame"/>,
91 <xref linkend="libtheora"/>,
92 <xref linkend="libvorbis"/>,
93 <xref linkend="libvpx"/>,
94 <xref linkend="opus"/>,
95 <xref linkend="x264"/>,
96 <xref linkend="x265"/>, and
97 <xref linkend="yasm"/>
98 </para>
99
100 <bridgehead renderas="sect4">Recommended for desktop use</bridgehead>
101 <para>
102 <xref linkend="alsa-lib"/>,
103 <xref linkend="libva"/>,
104 <xref linkend="libvdpau"/> (with the corresponding driver package), and
105 <xref linkend="sdl"/>
106 </para>
107
108 <bridgehead renderas="sect4">Optional</bridgehead>
109 <para role="optional">
110 <xref linkend="faac"/>,
111 <xref linkend="fontconfig"/>,
112 <xref linkend="frei0r"/>,
113 <xref linkend="libcdio"/> (to identify and play CDs),
114 <xref linkend="libwebp"/>,
115 <xref linkend="opencv"/>,
116 <xref linkend="openjpeg"/>,
117 <xref linkend="openssl"/> or
118 <xref linkend="gnutls"/>,
119 <xref linkend="pulseaudio"/>,
120 <xref linkend="speex"/>,
121 <xref linkend="texlive"/>
122 (or <xref linkend="tl-installer"/>) for PDF and PS documentation,
123 <xref linkend="v4l-utils"/>,
124 <xref linkend="xvid"/>,
125 <xref linkend="x-window-system"/>,
126 <ulink url="http://www.speech.cs.cmu.edu/flite/">Flite</ulink>,
127 <ulink url="http://www.quut.com/gsm/">GSM</ulink>,
128 <ulink url="http://xhevc.com/en/hevc/decoder/download.jsp">HEVC/H.265</ulink>,
129 <!--<ulink url="http://www.ladspa.org/">LADSPA</ulink>,-->
130 <ulink url="http://tipok.org.ua/node/17">libaacplus</ulink>,
131 <ulink url="http://www.videolan.org/developers/libbluray.html">libbluray</ulink>,
132 <ulink url="http://caca.zoy.org/">libcaca</ulink>,
133 <ulink url="http://www.celt-codec.org/">libcelt</ulink>,
134 <ulink url="http://sourceforge.net/projects/libdc1394">libdc1394</ulink>,
135 <ulink url="https://www.videolan.org/developers/libdca.html">libdca</ulink>,
136 <ulink url="https://ieee1394.wiki.kernel.org/index.php/Libraries">libiec61883</ulink>,
137 <ulink url="https://github.com/dekkers/libilbc">libilbc</ulink>,
138 <ulink url="http://sourceforge.net/projects/modplug-xmms/">libmodplug</ulink>,
139 <ulink url="https://github.com/Distrotech/libnut">libnut</ulink> (Git checkout),
140 <ulink url="http://rtmpdump.mplayerhq.hu/">librtmp</ulink>,
141 <ulink url="http://www.libssh.org/">libssh</ulink>,
142 <!--<ulink url="http://xavs.sourceforge.net/">libxavs</ulink> (SVN checkout),-->
143 <ulink url="http://kcat.strangesoft.net/openal-releases/">OpenAL</ulink>,
144 <ulink url="http://sourceforge.net/projects/opencore-amr">OpenCore AMR</ulink>,
145 <!--<ulink url="http://diracvideo.org/">Schroedinger</ulink>,-->
146 <ulink url="http://sourceforge.net/projects/schrodinger/">Schroedinger</ulink>,
147 <ulink url="http://www.twolame.org/">TwoLAME</ulink>,
148 <ulink url="http://sourceforge.net/projects/opencore-amr/files/vo-aacenc/">vo-aaenc</ulink>,
149 <ulink url="http://sourceforge.net/projects/opencore-amr/files/vo-amrwbenc/">vo-amrwbenc</ulink>, and
150 <!--<ulink url="http://www.videolan.org/developers/x265.html">x265 (H.265/MPEG-H HEVC)</ulink>, and-->
151 <ulink url="http://zapping.sourceforge.net/ZVBI/">ZVBI</ulink>
152 </para>
153
154 <para condition="html" role="usernotes">
155 User Notes: <ulink url="&blfs-wiki;/ffmpeg"/>
156 </para>
157 </sect2>
158
159 <sect2 role="installation">
160 <title>Installation of FFmpeg</title>
161
162 <para>
163 Install <application>FFmpeg</application> by running the following
164 commands:
165 </para>
166
167<screen><userinput>sed -i 's/-lflite"/-lflite -lasound"/' configure &amp;&amp;
168
169./configure --prefix=/usr \
170 --enable-gpl \
171 --enable-version3 \
172 --enable-nonfree \
173 --disable-static \
174 --enable-shared \
175 --disable-debug \
176 --enable-libass \
177 --enable-libfdk-aac \
178 --enable-libfreetype \
179 --enable-libmp3lame \
180 --enable-libopus \
181 --enable-libtheora \
182 --enable-libvorbis \
183 --enable-libvpx \
184 --enable-libx264 \
185 --enable-libx265 \
186 --enable-x11grab \
187 --docdir=/usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
188
189make &amp;&amp;
190
191gcc tools/qt-faststart.c -o tools/qt-faststart</userinput></screen>
192
193 <para>
194 HTML documentation was built in the previous step. If you have
195 <xref linkend="texlive"/> installed and wish to build PDF and
196 Postscript versions of the documentation, issue the following commands:
197 </para>
198
199<screen><userinput>sed -i '$s/$/\n\n@bye/' doc/{git-howto,nut,fate}.texi &amp;&amp;
200sed -i '/machine:i386/ s/\\/@backslashchar{}/g' doc/platform.texi &amp;&amp;
201
202pushd doc &amp;&amp;
203for DOCNAME in `basename -s .html *.html`
204do
205 texi2pdf -b $DOCNAME.texi &amp;&amp;
206 texi2dvi -b $DOCNAME.texi &amp;&amp;
207
208 dvips -o $DOCNAME.ps \
209 $DOCNAME.dvi
210done &amp;&amp;
211popd &amp;&amp;
212unset DOCNAME</userinput></screen>
213
214 <para>
215 If you have <xref linkend="doxygen"/> installed and wish to create the API
216 documentation (takes about 350 MB of space), issue the command
217 <command>doxygen doc/Doxyfile</command>.
218 </para>
219
220 <para>
221 The fate-suite tests include comparisons with installed files, and should
222 not be run before the package is installed. Therefore, if you desire to
223 run them, instructions are given further below.
224 </para>
225
226 <para>
227 Now, as the <systemitem class="username">root</systemitem> user:
228 </para>
229
230<screen role="root"><userinput>make install &amp;&amp;
231
232install -v -m755 tools/qt-faststart /usr/bin &amp;&amp;
233install -v -m644 doc/*.txt \
234 /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
235
236 <para>
237 If PDF and Postscript documentations were built, issue the following
238 commands, as the <systemitem class="username">root</systemitem> user, to
239 install them:
240 </para>
241
242<screen role="root"><userinput>install -v -m644 doc/*.pdf \
243 /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
244install -v -m644 doc/*.ps \
245 /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
246
247 <para>
248 If you used <command>doxygen</command> to create the API documentation,
249 install it (another 300 MB of space) by issuing the following commands
250 as the <systemitem class="username">root</systemitem> user:
251 </para>
252
253<screen role="root"><userinput>install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
254cp -vr doc/doxy/html/* /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
255find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type f -exec chmod -c 0644 \{} \; &amp;&amp;
256find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type d -exec chmod -c 0755 \{} \;</userinput></screen>
257
258 <para>
259 To properly test the installation you must have <xref linkend="rsync"/>
260 installed and follow the instructions for the <ulink
261 url="http://www.ffmpeg.org/fate.html"> FFmpeg Automated Testing
262 Environment</ulink> (FATE). First, about 958 MB of sample files used to
263 run FATE are downloaded with the command:
264 </para>
265
266<screen><userinput>make fate-rsync SAMPLES=fate-suite/</userinput></screen>
267
268 <para>
269 The <filename class="directory">fate-suite</filename> directory is
270 created and the files are downloaded there. That command actually runs an
271 rsync command, to obtain the sample files. You may want to compress and
272 keep this directory for testing again, in another system, or when a new
273 version of ffmpeg is launched. Then, you unpack the sample files in the
274 source directory, and run, again, the <command>make fate-rsync
275 ...</command> command above, to sync with the repository. Now, the
276 download size and time are drastically reduced. Estimated values in
277 "Package Information" do not include the download SBU. Some samples may
278 have been removed, in the new version, so, in order to be sure local and
279 server fate samples are identical, when you use previously saved samples,
280 run the following command:
281 </para>
282
283<screen><userinput><command>rsync -vrltLW --delete --timeout=60 --contimeout=60 \
284 rsync://fate-suite.ffmpeg.org/fate-suite/ fate-suite/</command></userinput></screen>
285
286 <para>
287 Next, FATE is executed, with the commands (you obtain a number of tests
288 larger than 2500):
289 </para>
290
291<screen><userinput>make fate THREADS=<replaceable>N</replaceable> SAMPLES=fate-suite/ | tee ../fate.log &amp;&amp;
292grep ^TEST ../fate.log | wc -l</userinput></screen>
293
294 <para>
295 where <replaceable>N</replaceable> is an integer,
296 <replaceable>N</replaceable> &le; number of threads in the system.
297 </para>
298
299 </sect2>
300
301 <sect2 role="commands">
302 <title>Command Explanations</title>
303
304 <para>
305 <command>sed -i ... configure</command>: This command adds the
306 <application>ALSA</application> library to the
307 <application>Flite</application> <envar>LDFLAGS</envar> variable and
308 enables the discovery of <application>Flite</application>.
309 </para>
310
311 <para>
312 <command>sed -i ... texi</command>: Fix some .texi files for
313 documentation builds.
314 </para>
315
316 <para>
317 <command>find ... ;</command>: Fix permissions of documentation files
318 and directories.
319 </para>
320
321 <para>
322 <option>--enable-libfreetype</option>: Enables
323 <application>Freetype</application> support.
324 </para>
325
326 <para>
327 <parameter>--enable-gpl</parameter>: Enables the use of GPL code and
328 permits support for postprocessing, swscale and many other features.
329 </para>
330
331 <para>
332 <parameter>--enable-version3</parameter>: Enables the use of (L)GPL
333 version 3 code.
334 </para>
335
336 <para>
337 <parameter>--enable-nonfree</parameter>: Enables the use of nonfree code.
338 Note that the resulting libraries and binaries will be unredistributable.
339 </para>
340
341 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
342 href="../../xincludes/static-libraries.xml"/>
343
344 <para>
345 <parameter>--enable-shared</parameter>: Enables building shared
346 libraries, otherwise only static libraries are built and installed.
347 </para>
348
349 <para>
350 <parameter>--disable-debug</parameter>: Disables building debugging
351 symbols into the programs and libraries.
352 </para>
353
354 <para>
355 <parameter>--enable-libass</parameter>: Enables ASS/SSA subtitle format
356 rendering via <filename class="libraryfile">libass</filename>.
357 </para>
358
359 <para>
360 <parameter>--enable-libfdk-aac</parameter>: Enables currently the
361 highest-quality AAC audio encoding via <filename
362 class="libraryfile">libfdk-aac</filename>.
363 </para>
364
365 <para>
366 <parameter>--enable-libmp3lame</parameter>: Enables MP3 audio encoding
367 via <filename class="libraryfile">libmp3lame</filename>.
368 </para>
369
370 <para>
371 <parameter>--enable-libvorbis --enable-libtheora</parameter>: Enables
372 Theora video encoding via <filename
373 class="libraryfile">libvorbis</filename> and <filename
374 class="libraryfile">libtheora</filename>.
375 </para>
376
377 <para>
378 <parameter>--enable-libvorbis --enable-libvpx</parameter>: Enables WebM
379 encoding via <filename class="libraryfile">libvorbis</filename> and
380 <filename class="libraryfile">libvpx</filename>.
381 </para>
382
383 <para>
384 <parameter>--enable-libx264</parameter>: Enables high-quality
385 H.264/MPEG-4 AVC encoding via <filename
386 class="libraryfile">libx264</filename>.
387 </para>
388
389 <para>
390 <parameter>--enable-libx265</parameter>: Enables high-quality
391 H.265/HEVC encoding via <filename
392 class="libraryfile">libx265</filename>.
393 </para>
394
395 <para>
396 <parameter>--enable-x11grab</parameter>: Enables X11 grabbing.
397 </para>
398
399 <para>
400 <option>--enable-openssl</option> or <option>--enable-gnutls</option>:
401 Enables HTTPS protocol for network streams.
402 </para>
403
404 <para>
405 <command>gcc tools/qt-faststart.c -o tools/qt-faststart</command>: This
406 builds the <command>qt-faststart</command> program which can modify
407 QuickTime formatted movies (<filename class="extension">.mov</filename>
408 or <filename class="extension">.mp4</filename>) so that the header
409 information is located at the beginning of the file instead of the end.
410 This allows the movie file to begin playing before the entire file has
411 been downloaded.
412 </para>
413
414 <note>
415 <para>
416 Support for most of the dependency packages requires using options
417 passed to the <command>configure</command> script. View the output
418 from <command>./configure --help</command> for complete information
419 about enabling dependency packages.
420 </para>
421 </note>
422
423 </sect2>
424
425 <sect2 role="configuration">
426 <title>Configuring FFmpeg</title>
427
428 <sect3 id="ffmpeg-config">
429 <title>Config Files</title>
430
431 <para>
432 <filename>/etc/ffserver.conf</filename> and
433 <filename>~/.ffmpeg/ffserver-config</filename>
434 </para>
435
436 <indexterm zone="ffmpeg ffmpeg-config">
437 <primary
438 sortas="e-AA.ffmpeg-ffserver-config">~/.ffmpeg/ffserver-config</primary>
439 </indexterm>
440
441 <indexterm zone="ffmpeg ffmpeg-config">
442 <primary sortas="e-etc-ffserver.conf">/etc/ffserver.conf</primary>
443 </indexterm>
444
445 <para>
446 You'll find a sample <command>ffserver</command> configuration file at
447 <filename>doc/ffserver.conf</filename> in the source tree.
448 </para>
449
450 </sect3>
451
452 </sect2>
453
454 <sect2 role="content">
455 <title>Contents</title>
456
457 <segmentedlist>
458 <segtitle>Installed Programs</segtitle>
459 <segtitle>Installed Libraries</segtitle>
460 <segtitle>Installed Directories</segtitle>
461
462 <seglistitem>
463 <seg>
464 ffmpeg, ffplay, ffprobe, ffserver, and qt-faststart
465 </seg>
466 <seg>
467 libavcodec.so, libavdevice.so, libavfilter.so,
468 libavformat.so, libavutil.so, libpostproc.so,
469 libswresample, and libswscale.so
470 </seg>
471 <seg>
472 /usr/include/libav{codec,device,filter,format,util},
473 /usr/include/libpostproc,
474 /usr/include/libsw{resample,scale},
475 /usr/share/doc/ffmpeg-&ffmpeg-version;, and
476 /usr/share/ffmpeg
477 </seg>
478 </seglistitem>
479 </segmentedlist>
480
481 <variablelist>
482 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
483 <?dbfo list-presentation="list"?>
484 <?dbhtml list-presentation="table"?>
485
486 <varlistentry id="ffmpeg-prog">
487 <term><command>ffmpeg</command></term>
488 <listitem>
489 <para>
490 is a command-line tool to convert video files, network streams and
491 input from a TV card to several video formats.
492 </para>
493 <indexterm zone="ffmpeg ffmpeg-prog">
494 <primary sortas="b-ffmpeg">ffmpeg</primary>
495 </indexterm>
496 </listitem>
497 </varlistentry>
498
499 <varlistentry id="ffplay">
500 <term><command>ffplay</command></term>
501 <listitem>
502 <para>
503 is a very simple and portable media player using the
504 <filename>ffmpeg</filename> libraries and the SDL library.
505 </para>
506 <indexterm zone="ffmpeg ffplay">
507 <primary sortas="b-ffplay">ffplay</primary>
508 </indexterm>
509 </listitem>
510 </varlistentry>
511
512 <varlistentry id="ffprobe">
513 <term><command>ffprobe</command></term>
514 <listitem>
515 <para>
516 gathers information from multimedia streams and prints it in a human
517 and machine-readable fashion.
518 </para>
519 <indexterm zone="ffmpeg ffprobe">
520 <primary sortas="b-ffprobe">ffprobe</primary>
521 </indexterm>
522 </listitem>
523 </varlistentry>
524
525 <varlistentry id="ffserver">
526 <term><command>ffserver</command></term>
527 <listitem>
528 <para>
529 is a streaming server for everything that <command>ffmpeg</command>
530 could use as input (files, streams, TV card input, webcam, etc).
531 </para>
532 <indexterm zone="ffmpeg ffserver">
533 <primary sortas="b-ffserver">ffserver</primary>
534 </indexterm>
535 </listitem>
536 </varlistentry>
537
538 <varlistentry id="qt-faststart">
539 <term><command>qt-faststart</command></term>
540 <listitem>
541 <para>
542 moves the index file to the front of quicktime (mov/mp4) videos.
543 </para>
544 <indexterm zone="ffmpeg qt-faststart">
545 <primary sortas="b-qt-faststart">qt-faststart</primary>
546 </indexterm>
547 </listitem>
548 </varlistentry>
549
550 <varlistentry id="libavcodec">
551 <term><filename class="libraryfile">libavcodec.so</filename></term>
552 <listitem>
553 <para>
554 is a library containing the <application>FFmpeg</application> codecs
555 (both encoding and decoding).
556 </para>
557 <indexterm zone="ffmpeg libavcodec">
558 <primary sortas="c-libavcodec">libavcodec.so</primary>
559 </indexterm>
560 </listitem>
561 </varlistentry>
562
563 <varlistentry id="libavdevice">
564 <term><filename class="libraryfile">libavdevice.so</filename></term>
565 <listitem>
566 <para>
567 is the <application>FFmpeg</application> device handling library.
568 </para>
569 <indexterm zone="ffmpeg libavdevice">
570 <primary sortas="c-libavdevice">libavdevice.so</primary>
571 </indexterm>
572 </listitem>
573 </varlistentry>
574
575 <varlistentry id="libavfilter">
576 <term><filename class="libraryfile">libavfilter.so</filename></term>
577 <listitem>
578 <para>
579 is a library of filters that can alter video or audio between the
580 decoder and the encoder (or output).
581 </para>
582 <indexterm zone="ffmpeg libavfilter">
583 <primary sortas="c-libavfilter">libavfilter.so</primary>
584 </indexterm>
585 </listitem>
586 </varlistentry>
587
588 <varlistentry id="libavformat">
589 <term><filename class="libraryfile">libavformat.so</filename></term>
590 <listitem>
591 <para>
592 is a library containing the file formats handling (mux and demux
593 code for several formats) used by <command>ffplay</command> as well
594 as allowing the generation of audio or video streams.
595 </para>
596 <indexterm zone="ffmpeg libavformat">
597 <primary sortas="c-libavformat">libavformat.so</primary>
598 </indexterm>
599 </listitem>
600 </varlistentry>
601
602 <varlistentry id="libavutil">
603 <term><filename class="libraryfile">libavutil.so</filename></term>
604 <listitem>
605 <para>
606 is the <application>FFmpeg</application> utility library.
607 </para>
608 <indexterm zone="ffmpeg libavutil">
609 <primary sortas="c-libavutil">libavutil.so</primary>
610 </indexterm>
611 </listitem>
612 </varlistentry>
613
614 <varlistentry id="libpostproc">
615 <term><filename class="libraryfile">libpostproc.so</filename></term>
616 <listitem>
617 <para>
618 is the <application>FFmpeg</application> post processing library.
619 </para>
620 <indexterm zone="ffmpeg libpostproc">
621 <primary sortas="c-libpostproc">libpostproc.so</primary>
622 </indexterm>
623 </listitem>
624 </varlistentry>
625
626 <varlistentry id="libswresample">
627 <term><filename class="libraryfile">libswresample.so</filename></term>
628 <listitem>
629 <para>
630 is the <application>FFmpeg</application> audio rescaling library,
631 it contains functions for converting audio sample formats.
632 </para>
633 <indexterm zone="ffmpeg libswresample">
634 <primary sortas="c-libswresample">libswresample.so</primary>
635 </indexterm>
636 </listitem>
637 </varlistentry>
638
639 <varlistentry id="libswscale">
640 <term><filename class="libraryfile">libswscale.so</filename></term>
641 <listitem>
642 <para>
643 is the <application>FFmpeg</application> image rescaling library.
644 </para>
645 <indexterm zone="ffmpeg libswscale">
646 <primary sortas="c-libswscale">libswscale.so</primary>
647 </indexterm>
648 </listitem>
649 </varlistentry>
650
651 </variablelist>
652
653 </sect2>
654
655</sect1>
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