source: multimedia/videoutils/ffmpeg.xml@ d6c6562

10.0 10.1 11.0 11.1 11.2 11.3 12.0 12.1 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 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 d6c6562 was d6c6562, checked in by Bruce Dubbs <bdubbs@…>, 7 years ago

Remove gcc7 entity

git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@19032 af4574ff-66df-0310-9fd7-8a98e5e911e0

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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 "743dc66ebe67180283b92d029f690d0f">
10 <!ENTITY ffmpeg-size "7.9 MB">
11 <!ENTITY ffmpeg-buildsize "134 MB (add 2.7 GB for the FATE suite/tests, add 17 MB for docs)">
12 <!ENTITY ffmpeg-time "4.1 SBU (add 5.1 SBU to run the FATE suite after sample files are downloaded, add 0.4 SBU for docs)">
13]>
14
15<sect1 id="ffmpeg" xreflabel="FFmpeg-&ffmpeg-version;">
16 <?dbhtml filename="ffmpeg.html"?>
17
18 <sect1info>
19 <othername>$LastChangedBy$</othername>
20 <date>$Date$</date>
21 </sect1info>
22
23 <title>FFmpeg-&ffmpeg-version;</title>
24
25 <indexterm zone="ffmpeg">
26 <primary sortas="a-FFmpeg">FFmpeg</primary>
27 </indexterm>
28
29 <sect2 role="package">
30 <title>Introduction to FFmpeg</title>
31
32 <para>
33 <application>FFmpeg</application> is a solution to record, convert and
34 stream audio and video. It is a very fast video and audio converter and it
35 can also acquire from a live audio/video source. Designed to be intuitive,
36 the command-line interface (<command>ffmpeg</command>) tries to figure out
37 all the parameters, when possible. <application>FFmpeg</application> can
38 also convert from any sample rate to any other, and resize video on the
39 fly with a high quality polyphase filter.
40 <application>FFmpeg</application> can use a Video4Linux compatible video
41 source and any Open Sound System audio source.
42 </para>
43
44 &lfs80_checked;
45
46 <bridgehead renderas="sect3">Package Information</bridgehead>
47 <itemizedlist spacing="compact">
48 <listitem>
49 <para>
50 Download (HTTP): <ulink url="&ffmpeg-download-http;"/>
51 </para>
52 </listitem>
53 <listitem>
54 <para>
55 Download (FTP): <ulink url="&ffmpeg-download-ftp;"/>
56 </para>
57 </listitem>
58 <listitem>
59 <para>
60 Download MD5 sum: &ffmpeg-md5sum;
61 </para>
62 </listitem>
63 <listitem>
64 <para>
65 Download size: &ffmpeg-size;
66 </para>
67 </listitem>
68 <listitem>
69 <para>
70 Estimated disk space required: &ffmpeg-buildsize;
71 </para>
72 </listitem>
73 <listitem>
74 <para>
75 Estimated build time: &ffmpeg-time;
76 </para>
77 </listitem>
78 </itemizedlist>
79
80 <bridgehead renderas="sect3">FFmpeg Dependencies</bridgehead>
81
82 <bridgehead renderas="sect4">Recommended</bridgehead>
83 <para role="recommended">
84 <xref linkend="libass"/>,
85 <xref linkend="fdk-aac"/>,
86 <xref linkend="freetype2"/>,
87 <xref linkend="lame"/>,
88 <xref linkend="libtheora"/>,
89 <xref linkend="libvorbis"/>,
90 <xref linkend="libvpx"/>,
91 <xref linkend="opus"/>,
92 <xref linkend="x264"/>,
93 <xref linkend="x265"/>, and
94 <xref linkend="yasm"/>
95 </para>
96
97 <bridgehead renderas="sect4">Recommended for desktop use</bridgehead>
98 <para role="recommended">
99 <xref linkend="alsa-lib"/>,
100 <xref linkend="libva"/>,
101 <xref linkend="libvdpau"/> (with the corresponding driver package), and
102 <xref linkend="sdl2"/>,
103 </para>
104
105 <bridgehead renderas="sect4">Optional</bridgehead>
106 <para role="optional">
107 <xref linkend="fontconfig"/>,
108 <xref linkend="frei0r"/>,
109 <xref linkend="libcdio"/> (to identify and play CDs),
110 <xref linkend="libwebp"/>,
111 <xref linkend="opencv"/>,
112 <xref linkend="openjpeg"/>,
113 <xref linkend="openssl"/> or
114 <xref linkend="gnutls"/>,
115 <xref linkend="pulseaudio"/>,
116 <xref linkend="speex"/>,
117 <xref linkend="texlive"/>
118 (or <xref linkend="tl-installer"/>) for PDF and PS documentation,
119 <xref linkend="v4l-utils"/>,
120 <xref linkend="xvid"/>,
121 <xref linkend="x-window-system"/>,
122 <ulink url="http://www.speech.cs.cmu.edu/flite/">Flite</ulink>,
123 <ulink url="http://www.quut.com/gsm/">GSM</ulink>,
124 <ulink url="http://xhevc.com/en/hevc/decoder/download.jsp">HEVC/H.265</ulink>,
125 <!--<ulink url="http://www.ladspa.org/">LADSPA</ulink>,-->
126 <ulink url="http://tipok.org.ua/node/17">libaacplus</ulink>,
127 <ulink url="http://www.videolan.org/developers/libbluray.html">libbluray</ulink>,
128 <ulink url="http://caca.zoy.org/">libcaca</ulink>,
129 <ulink url="http://www.celt-codec.org/">libcelt</ulink>,
130 <ulink url="http://sourceforge.net/projects/libdc1394">libdc1394</ulink>,
131 <ulink url="https://www.videolan.org/developers/libdca.html">libdca</ulink>,
132 <ulink url="https://ieee1394.wiki.kernel.org/index.php/Libraries">libiec61883</ulink>,
133 <ulink url="https://github.com/dekkers/libilbc">libilbc</ulink>,
134 <ulink url="http://sourceforge.net/projects/modplug-xmms/">libmodplug</ulink>,
135 <ulink url="https://github.com/Distrotech/libnut">libnut</ulink> (Git checkout),
136 <ulink url="http://rtmpdump.mplayerhq.hu/">librtmp</ulink>,
137 <ulink url="http://www.libssh.org/">libssh</ulink>,
138 <!--<ulink url="http://xavs.sourceforge.net/">libxavs</ulink> (SVN checkout),-->
139 <ulink url="http://kcat.strangesoft.net/openal-releases/">OpenAL</ulink>,
140 <ulink url="http://sourceforge.net/projects/opencore-amr">OpenCore AMR</ulink>,
141 <!--<ulink url="http://diracvideo.org/">Schroedinger</ulink>,-->
142 <ulink url="http://sourceforge.net/projects/schrodinger/">Schroedinger</ulink>,
143 <ulink url="http://www.twolame.org/">TwoLAME</ulink>,
144 <ulink url="http://sourceforge.net/projects/opencore-amr/files/vo-aacenc/">vo-aaenc</ulink>,
145 <ulink url="http://sourceforge.net/projects/opencore-amr/files/vo-amrwbenc/">vo-amrwbenc</ulink>, and
146 <!--<ulink url="http://www.videolan.org/developers/x265.html">x265 (H.265/MPEG-H HEVC)</ulink>, and-->
147 <ulink url="http://zapping.sourceforge.net/ZVBI/">ZVBI</ulink>
148 </para>
149
150 <para condition="html" role="usernotes">
151 User Notes: <ulink url="&blfs-wiki;/ffmpeg"/>
152 </para>
153 </sect2>
154
155 <sect2 role="installation">
156 <title>Installation of FFmpeg</title>
157
158 <para>
159 Install <application>FFmpeg</application> by running the following
160 commands:
161 </para>
162
163<screen><userinput>sed -i 's/-lflite"/-lflite -lasound"/' configure &amp;&amp;
164
165./configure --prefix=/usr \
166 --enable-gpl \
167 --enable-version3 \
168 --enable-nonfree \
169 --disable-static \
170 --enable-shared \
171 --disable-debug \
172 --enable-libass \
173 --enable-libfdk-aac \
174 --enable-libfreetype \
175 --enable-libmp3lame \
176 --enable-libopus \
177 --enable-libtheora \
178 --enable-libvorbis \
179 --enable-libvpx \
180 --enable-libx264 \
181 --enable-libx265 \
182 --docdir=/usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
183
184make &amp;&amp;
185
186gcc tools/qt-faststart.c -o tools/qt-faststart</userinput></screen>
187
188 <para>
189 HTML documentation was built in the previous step. If you have
190 <xref linkend="texlive"/> installed and wish to build PDF and
191 Postscript versions of the documentation, issue the following commands:
192 </para>
193
194<!-- sed -i '$s/$/\n\n@bye/' doc/{git-howto,nut,fate}.texi &amp;&amp;
195sed -i '/machine:i386/ s/\\/@backslashchar{}/g' doc/platform.texi &amp;&amp; -->
196<screen><userinput>pushd doc &amp;&amp;
197for DOCNAME in `basename -s .html *.html`
198do
199 texi2pdf -b $DOCNAME.texi &amp;&amp;
200 texi2dvi -b $DOCNAME.texi &amp;&amp;
201
202 dvips -o $DOCNAME.ps \
203 $DOCNAME.dvi
204done &amp;&amp;
205popd &amp;&amp;
206unset DOCNAME</userinput></screen>
207
208 <para>
209 If you have <xref linkend="doxygen"/> installed
210 and you wish to build (if --disable-doc was
211 used) or rebuild the html documentation, issue the command
212 <command>doxygen doc/Doxyfile</command>.
213 </para>
214
215 <para>
216 The fate-suite tests include comparisons with installed files, and should
217 not be run before the package is installed. Therefore, if you desire to
218 run them, instructions are given further below.
219 </para>
220
221 <para>
222 Now, as the <systemitem class="username">root</systemitem> user:
223 </para>
224
225<screen role="root"><userinput>make install &amp;&amp;
226
227install -v -m755 tools/qt-faststart /usr/bin &amp;&amp;
228install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
229install -v -m644 doc/*.txt /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
230
231 <para>
232 If the PDF and Postscript documentation was built, issue the following
233 commands, as the <systemitem class="username">root</systemitem> user, to
234 install them:
235 </para>
236
237<screen role="root"><userinput>install -v -m644 doc/*.pdf /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
238install -v -m644 doc/*.ps /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
239
240 <para>
241 If you used <command>doxygen</command> to manually create the API
242 documentation, install it by issuing the following commands
243 as the <systemitem class="username">root</systemitem> user:
244 </para>
245
246<screen role="root"><userinput>install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
247cp -vr doc/doxy/html/* /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
248find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type f -exec chmod -c 0644 \{} \; &amp;&amp;
249find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type d -exec chmod -c 0755 \{} \;</userinput></screen>
250
251 <para>
252 To properly test the installation you must have <xref linkend="rsync"/>
253 installed and follow the instructions for the <ulink
254 url="http://www.ffmpeg.org/fate.html"> FFmpeg Automated Testing
255 Environment</ulink> (FATE). First, about 1 GB of sample files used to
256 run FATE are downloaded with the command:
257 </para>
258
259<screen><userinput>make fate-rsync SAMPLES=fate-suite/</userinput></screen>
260
261 <para>
262 The <filename class="directory">fate-suite</filename> directory is
263 created and the files are downloaded there. That command actually runs an
264 rsync command, to obtain the sample files. You may want to compress and
265 keep this directory for testing again, in another system, or when a new
266 version of ffmpeg is launched. Then, you unpack the sample files in the
267 source directory, and run, again, the <command>make fate-rsync
268 ...</command> command above, to sync with the repository. Now, the
269 download size and time are drastically reduced. Estimated values in
270 "Package Information" do not include the download SBU. Some samples may
271 have been removed, in the new version, so, in order to be sure local and
272 server fate samples are identical, when you use previously saved samples,
273 run the following command:
274 </para>
275
276<screen><userinput><command>rsync -vrltLW --delete --timeout=60 --contimeout=60 \
277 rsync://fate-suite.ffmpeg.org/fate-suite/ fate-suite/</command></userinput></screen>
278
279 <para>
280 Next, FATE is executed, with the commands (you obtain a number of tests
281 larger than 3000):
282 </para>
283
284<screen><userinput>make fate THREADS=<replaceable>N</replaceable> SAMPLES=fate-suite/ | tee ../fate.log &amp;&amp;
285grep ^TEST ../fate.log | wc -l</userinput></screen>
286
287 <para>
288 where <replaceable>N</replaceable> is an integer,
289 <replaceable>N</replaceable> &le; number of cores in the system.
290 </para>
291
292 </sect2>
293
294 <sect2 role="commands">
295 <title>Command Explanations</title>
296
297 <para>
298 <command>sed -i ... configure</command>: This command adds the
299 <application>ALSA</application> library to the
300 <application>Flite</application> <envar>LDFLAGS</envar> variable and
301 enables the discovery of <application>Flite</application>.
302 </para>
303
304 <para>
305 <command>find ... ;</command>: Fix permissions of documentation files
306 and directories.
307 </para>
308
309 <para>
310 <parameter>--enable-libfreetype</parameter>: Enables
311 <application>Freetype</application> support.
312 </para>
313
314 <para>
315 <parameter>--enable-gpl</parameter>: Enables the use of GPL code and
316 permits support for postprocessing, swscale and many other features.
317 </para>
318
319 <para>
320 <parameter>--enable-version3</parameter>: Enables the use of (L)GPL
321 version 3 code.
322 </para>
323
324 <para>
325 <parameter>--enable-nonfree</parameter>: Enables the use of nonfree code.
326 Note that the resulting libraries and binaries will be unredistributable.
327 </para>
328
329 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
330 href="../../xincludes/static-libraries.xml"/>
331
332 <para>
333 <parameter>--enable-shared</parameter>: Enables building shared
334 libraries, otherwise only static libraries are built and installed.
335 </para>
336
337 <para>
338 <parameter>--disable-debug</parameter>: Disables building debugging
339 symbols into the programs and libraries.
340 </para>
341
342 <para>
343 <parameter>--enable-libass</parameter>: Enables ASS/SSA subtitle format
344 rendering via <filename class="libraryfile">libass</filename>.
345 </para>
346
347 <para>
348 <parameter>--enable-libfdk-aac</parameter>: Enables currently the
349 highest-quality AAC audio encoding via <filename
350 class="libraryfile">libfdk-aac</filename>.
351 </para>
352
353 <para>
354 <parameter>--enable-libmp3lame</parameter>: Enables MP3 audio encoding
355 via <filename class="libraryfile">libmp3lame</filename>.
356 </para>
357
358 <para>
359 <parameter>--enable-libvorbis --enable-libtheora</parameter>: Enables
360 Theora video encoding via <filename
361 class="libraryfile">libvorbis</filename> and <filename
362 class="libraryfile">libtheora</filename>.
363 </para>
364
365 <para>
366 <parameter>--enable-libvorbis --enable-libvpx</parameter>: Enables WebM
367 encoding via <filename class="libraryfile">libvorbis</filename> and
368 <filename class="libraryfile">libvpx</filename>.
369 </para>
370
371 <para>
372 <parameter>--enable-libx264</parameter>: Enables high-quality
373 H.264/MPEG-4 AVC encoding via <filename
374 class="libraryfile">libx264</filename>.
375 </para>
376
377 <para>
378 <parameter>--enable-libx265</parameter>: Enables high-quality
379 H.265/HEVC encoding via <filename
380 class="libraryfile">libx265</filename>.
381 </para>
382
383 <para>
384 <option>--enable-openssl</option> or <option>--enable-gnutls</option>:
385 Enables HTTPS protocol for network streams.
386 </para>
387
388 <para>
389 <option>--disable-doc</option>: Disables building html documentation.
390 This is only needed if <xref linkend="doxygen"/> is installed and you
391 do not want to build the html documentation.
392 </para>
393
394 <para>
395 <command>gcc tools/qt-faststart.c -o tools/qt-faststart</command>: This
396 builds the <command>qt-faststart</command> program which can modify
397 QuickTime formatted movies (<filename class="extension">.mov</filename>
398 or <filename class="extension">.mp4</filename>) so that the header
399 information is located at the beginning of the file instead of the end.
400 This allows the movie file to begin playing before the entire file has
401 been downloaded.
402 </para>
403
404 <note>
405 <para>
406 Support for most of the dependency packages requires using options
407 passed to the <command>configure</command> script. View the output
408 from <command>./configure --help</command> for complete information
409 about enabling dependency packages.
410 </para>
411 </note>
412
413 </sect2>
414
415 <sect2 role="configuration">
416 <title>Configuring FFmpeg</title>
417
418 <sect3 id="ffmpeg-config">
419 <title>Config Files</title>
420
421 <para>
422 <filename>/etc/ffserver.conf</filename> and
423 <filename>~/.ffmpeg/ffserver-config</filename>
424 </para>
425
426 <indexterm zone="ffmpeg ffmpeg-config">
427 <primary
428 sortas="e-AA.ffmpeg-ffserver-config">~/.ffmpeg/ffserver-config</primary>
429 </indexterm>
430
431 <indexterm zone="ffmpeg ffmpeg-config">
432 <primary sortas="e-etc-ffserver.conf">/etc/ffserver.conf</primary>
433 </indexterm>
434
435 <para>
436 You'll find a sample <command>ffserver</command> configuration file at
437 <filename>doc/ffserver.conf</filename> in the source tree.
438 </para>
439
440 </sect3>
441
442 </sect2>
443
444 <sect2 role="content">
445 <title>Contents</title>
446
447 <segmentedlist>
448 <segtitle>Installed Programs</segtitle>
449 <segtitle>Installed Libraries</segtitle>
450 <segtitle>Installed Directories</segtitle>
451
452 <seglistitem>
453 <seg>
454 ffmpeg, ffplay, ffprobe, ffserver, and qt-faststart
455 </seg>
456 <seg>
457 libavcodec.so, libavdevice.so, libavfilter.so,
458 libavformat.so, libavutil.so, libpostproc.so,
459 libswresample.so, and libswscale.so
460 </seg>
461 <seg>
462 /usr/include/libav{codec,device,filter,format,util},
463 /usr/include/libpostproc,
464 /usr/include/libsw{resample,scale},
465 /usr/share/doc/ffmpeg-&ffmpeg-version;, and
466 /usr/share/ffmpeg
467 </seg>
468 </seglistitem>
469 </segmentedlist>
470
471 <variablelist>
472 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
473 <?dbfo list-presentation="list"?>
474 <?dbhtml list-presentation="table"?>
475
476 <varlistentry id="ffmpeg-prog">
477 <term><command>ffmpeg</command></term>
478 <listitem>
479 <para>
480 is a command-line tool to convert video files, network streams and
481 input from a TV card to several video formats.
482 </para>
483 <indexterm zone="ffmpeg ffmpeg-prog">
484 <primary sortas="b-ffmpeg">ffmpeg</primary>
485 </indexterm>
486 </listitem>
487 </varlistentry>
488
489 <varlistentry id="ffplay">
490 <term><command>ffplay</command></term>
491 <listitem>
492 <para>
493 is a very simple and portable media player using the
494 <filename>ffmpeg</filename> libraries and the SDL library.
495 </para>
496 <indexterm zone="ffmpeg ffplay">
497 <primary sortas="b-ffplay">ffplay</primary>
498 </indexterm>
499 </listitem>
500 </varlistentry>
501
502 <varlistentry id="ffprobe">
503 <term><command>ffprobe</command></term>
504 <listitem>
505 <para>
506 gathers information from multimedia streams and prints it in a human
507 and machine-readable fashion.
508 </para>
509 <indexterm zone="ffmpeg ffprobe">
510 <primary sortas="b-ffprobe">ffprobe</primary>
511 </indexterm>
512 </listitem>
513 </varlistentry>
514
515 <varlistentry id="ffserver">
516 <term><command>ffserver</command></term>
517 <listitem>
518 <para>
519 is a streaming server for everything that <command>ffmpeg</command>
520 could use as input (files, streams, TV card input, webcam, etc).
521 </para>
522 <indexterm zone="ffmpeg ffserver">
523 <primary sortas="b-ffserver">ffserver</primary>
524 </indexterm>
525 </listitem>
526 </varlistentry>
527
528 <varlistentry id="qt-faststart">
529 <term><command>qt-faststart</command></term>
530 <listitem>
531 <para>
532 moves the index file to the front of quicktime (mov/mp4) videos.
533 </para>
534 <indexterm zone="ffmpeg qt-faststart">
535 <primary sortas="b-qt-faststart">qt-faststart</primary>
536 </indexterm>
537 </listitem>
538 </varlistentry>
539
540 <varlistentry id="libavcodec">
541 <term><filename class="libraryfile">libavcodec.so</filename></term>
542 <listitem>
543 <para>
544 is a library containing the <application>FFmpeg</application> codecs
545 (both encoding and decoding).
546 </para>
547 <indexterm zone="ffmpeg libavcodec">
548 <primary sortas="c-libavcodec">libavcodec.so</primary>
549 </indexterm>
550 </listitem>
551 </varlistentry>
552
553 <varlistentry id="libavdevice">
554 <term><filename class="libraryfile">libavdevice.so</filename></term>
555 <listitem>
556 <para>
557 is the <application>FFmpeg</application> device handling library.
558 </para>
559 <indexterm zone="ffmpeg libavdevice">
560 <primary sortas="c-libavdevice">libavdevice.so</primary>
561 </indexterm>
562 </listitem>
563 </varlistentry>
564
565 <varlistentry id="libavfilter">
566 <term><filename class="libraryfile">libavfilter.so</filename></term>
567 <listitem>
568 <para>
569 is a library of filters that can alter video or audio between the
570 decoder and the encoder (or output).
571 </para>
572 <indexterm zone="ffmpeg libavfilter">
573 <primary sortas="c-libavfilter">libavfilter.so</primary>
574 </indexterm>
575 </listitem>
576 </varlistentry>
577
578 <varlistentry id="libavformat">
579 <term><filename class="libraryfile">libavformat.so</filename></term>
580 <listitem>
581 <para>
582 is a library containing the file formats handling (mux and demux
583 code for several formats) used by <command>ffplay</command> as well
584 as allowing the generation of audio or video streams.
585 </para>
586 <indexterm zone="ffmpeg libavformat">
587 <primary sortas="c-libavformat">libavformat.so</primary>
588 </indexterm>
589 </listitem>
590 </varlistentry>
591
592 <varlistentry id="libavutil">
593 <term><filename class="libraryfile">libavutil.so</filename></term>
594 <listitem>
595 <para>
596 is the <application>FFmpeg</application> utility library.
597 </para>
598 <indexterm zone="ffmpeg libavutil">
599 <primary sortas="c-libavutil">libavutil.so</primary>
600 </indexterm>
601 </listitem>
602 </varlistentry>
603
604 <varlistentry id="libpostproc">
605 <term><filename class="libraryfile">libpostproc.so</filename></term>
606 <listitem>
607 <para>
608 is the <application>FFmpeg</application> post processing library.
609 </para>
610 <indexterm zone="ffmpeg libpostproc">
611 <primary sortas="c-libpostproc">libpostproc.so</primary>
612 </indexterm>
613 </listitem>
614 </varlistentry>
615
616 <varlistentry id="libswresample">
617 <term><filename class="libraryfile">libswresample.so</filename></term>
618 <listitem>
619 <para>
620 is the <application>FFmpeg</application> audio rescaling library,
621 it contains functions for converting audio sample formats.
622 </para>
623 <indexterm zone="ffmpeg libswresample">
624 <primary sortas="c-libswresample">libswresample.so</primary>
625 </indexterm>
626 </listitem>
627 </varlistentry>
628
629 <varlistentry id="libswscale">
630 <term><filename class="libraryfile">libswscale.so</filename></term>
631 <listitem>
632 <para>
633 is the <application>FFmpeg</application> image rescaling library.
634 </para>
635 <indexterm zone="ffmpeg libswscale">
636 <primary sortas="c-libswscale">libswscale.so</primary>
637 </indexterm>
638 </listitem>
639 </varlistentry>
640
641 </variablelist>
642
643 </sect2>
644
645</sect1>
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