source: multimedia/videoutils/ffmpeg.xml@ 4f4f272

10.0 10.1 11.0 ken/refactor-virt lazarus qt5new trunk upgradedb xry111/git-date xry111/git-date-for-trunk xry111/git-date-test
Last change on this file since 4f4f272 was 4f4f272, checked in by Bruce Dubbs <bdubbs@…>, 20 months ago

Update to ffmpeg-4.3.
Update to iptables-1.8.5.

git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@23293 af4574ff-66df-0310-9fd7-8a98e5e911e0

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File size: 23.6 KB
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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 "3adcf4f122fcc54624f5d509107d5625">
10 <!ENTITY ffmpeg-size "8.9 MB">
11 <!ENTITY ffmpeg-buildsize "166 MB (add 3.7 GB for the FATE suite/tests, add 1.3 GB for doxygen docs)">
12 <!ENTITY ffmpeg-time "1.5 SBU (using parallelism=4; add 3.8 SBU (with THREADS=4) to run the FATE suite after sample files are downloaded; add 1.1 SBU for doxygen 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 &lfs91_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="openjpeg2"/>,
113 <xref linkend="gnutls"/>,
114 <xref linkend="pulseaudio"/>,
115 <xref linkend="speex"/>,
116 <xref linkend="texlive"/>
117 (or <xref linkend="tl-installer"/>) for PDF and PS documentation,
118 <xref linkend="v4l-utils"/>,
119 <xref linkend="xvid"/>,
120 <xref linkend="x-window-system"/>,
121 <ulink url="http://www.speech.cs.cmu.edu/flite/">Flite</ulink>,
122 <ulink url="http://www.quut.com/gsm/">GSM</ulink>,
123 <!--<ulink url="http://xhevc.com/en/hevc/decoder/download.jsp">HEVC/H.265</ulink>,-->
124 <!--<ulink url="http://www.ladspa.org/">LADSPA</ulink>,-->
125 <ulink url="http://tipok.org.ua/node/17">libaacplus</ulink>,
126 <ulink url="http://www.videolan.org/developers/libbluray.html">libbluray</ulink>,
127 <ulink url="http://caca.zoy.org/">libcaca</ulink>,
128 <ulink url="https://gitlab.xiph.org/xiph/celt">libcelt</ulink>,
129 <ulink url="http://sourceforge.net/projects/libdc1394">libdc1394</ulink>,
130 <ulink url="https://www.videolan.org/developers/libdca.html">libdca</ulink>,
131 <ulink url="https://ieee1394.wiki.kernel.org/index.php/Libraries">libiec61883</ulink>,
132 <ulink url="https://github.com/dekkers/libilbc">libilbc</ulink>,
133 <ulink url="http://sourceforge.net/projects/modplug-xmms/">libmodplug</ulink>,
134 <ulink url="https://github.com/Distrotech/libnut">libnut</ulink> (Git checkout),
135 <ulink url="http://rtmpdump.mplayerhq.hu/">librtmp</ulink>,
136 <ulink url="http://www.libssh.org/">libssh</ulink>,
137 <!--<ulink url="http://xavs.sourceforge.net/">libxavs</ulink> (SVN checkout),-->
138 <ulink url="http://kcat.strangesoft.net/openal-releases/">OpenAL</ulink>,
139 <ulink url="http://sourceforge.net/projects/opencore-amr">OpenCore AMR</ulink>,
140 <!--<ulink url="http://diracvideo.org/">Schroedinger</ulink>,-->
141 <ulink url="http://sourceforge.net/projects/schrodinger/">Schroedinger</ulink>,
142 <ulink url="http://www.twolame.org/">TwoLAME</ulink>,
143 <ulink url="http://sourceforge.net/projects/opencore-amr/files/vo-aacenc/">vo-aaenc</ulink>,
144 <ulink url="http://sourceforge.net/projects/opencore-amr/files/vo-amrwbenc/">vo-amrwbenc</ulink>, and
145 <!--<ulink url="http://www.videolan.org/developers/x265.html">x265 (H.265/MPEG-H HEVC)</ulink>, and-->
146 <ulink url="http://zapping.sourceforge.net/ZVBI/">ZVBI</ulink>
147 </para>
148
149 <para condition="html" role="usernotes">
150 User Notes: <ulink url="&blfs-wiki;/ffmpeg"/>
151 </para>
152 </sect2>
153
154 <sect2 role="installation">
155 <title>Installation of FFmpeg</title>
156
157 <para>
158 Install <application>FFmpeg</application> by running the following
159 commands:
160 </para>
161
162<screen><userinput>sed -i 's/-lflite"/-lflite -lasound"/' configure &amp;&amp;
163
164./configure --prefix=/usr \
165 --enable-gpl \
166 --enable-version3 \
167 --enable-nonfree \
168 --disable-static \
169 --enable-shared \
170 --disable-debug \
171 --enable-avresample \
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 remap="doc"><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:
212 </para>
213
214<screen remap="doc"><userinput>doxygen doc/Doxyfile</userinput></screen>
215
216 <para>
217 The fate-suite tests include comparisons with installed files, and should
218 not be run before the package is installed. Therefore, if you desire to
219 run them, instructions are given further below.
220 </para>
221
222 <para>
223 Now, as the <systemitem class="username">root</systemitem> user:
224 </para>
225
226<screen role="root"><userinput>make install &amp;&amp;
227
228install -v -m755 tools/qt-faststart /usr/bin &amp;&amp;
229install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
230install -v -m644 doc/*.txt /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
231
232 <para>
233 If the PDF and Postscript documentation was built, issue the following
234 commands, as the <systemitem class="username">root</systemitem> user, to
235 install them:
236 </para>
237
238<screen role="root"
239 remap="doc"><userinput>install -v -m644 doc/*.pdf /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
240install -v -m644 doc/*.ps /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
241
242 <para>
243 If you used <command>doxygen</command> to manually create the API
244 documentation, install it by issuing the following commands
245 as the <systemitem class="username">root</systemitem> user:
246 </para>
247
248<screen role="root"
249 remap="doc"><userinput>install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
250cp -vr doc/doxy/html/* /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
251find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type f -exec chmod -c 0644 \{} \; &amp;&amp;
252find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type d -exec chmod -c 0755 \{} \;</userinput></screen>
253
254 <para>
255 To properly test the installation you must have <xref linkend="rsync"/>
256 installed and follow the instructions for the <ulink
257 url="http://www.ffmpeg.org/fate.html"> FFmpeg Automated Testing
258 Environment</ulink> (FATE). First, about 1 GB of sample files used to
259 run FATE are downloaded with the command:
260 </para>
261
262<screen remap="test"><userinput>make fate-rsync SAMPLES=fate-suite/</userinput></screen>
263
264 <para>
265 The <filename class="directory">fate-suite</filename> directory is
266 created and the files are downloaded there. That command actually runs an
267 rsync command, to obtain the sample files. You may want to compress and
268 keep this directory for testing again, in another system, or when a new
269 version of ffmpeg is launched. Then, you unpack the sample files in the
270 source directory, and run, again, the <command>make fate-rsync
271 ...</command> command above, to sync with the repository. Now, the
272 download size and time are drastically reduced. Estimated values in
273 "Package Information" do not include the download SBU. Some samples may
274 have been removed, in the new version, so, in order to be sure local and
275 server fate samples are identical, when you use previously saved samples,
276 run the following command:
277 </para>
278
279<screen role="nodump"><userinput>rsync -vrltLW --delete --timeout=60 --contimeout=60 \
280 rsync://fate-suite.ffmpeg.org/fate-suite/ fate-suite/</userinput></screen>
281
282 <para>
283 Next, FATE is executed, with the commands (you obtain a number of tests
284 larger than 3700):
285 </para>
286
287<screen remap="test"><userinput>make fate THREADS=<replaceable>N</replaceable> SAMPLES=fate-suite/ | tee ../fate.log &amp;&amp;
288grep ^TEST ../fate.log | wc -l</userinput></screen>
289
290 <para>
291 where <replaceable>N</replaceable> is an integer,
292 <replaceable>N</replaceable> &le; number of cores in the system.
293 </para>
294
295 </sect2>
296
297 <sect2 role="commands">
298 <title>Command Explanations</title>
299
300 <para>
301 <command>sed -i ... configure</command>: This command adds the
302 <application>ALSA</application> library to the
303 <application>Flite</application> <envar>LDFLAGS</envar> variable and
304 enables the discovery of <application>Flite</application>.
305 </para>
306
307 <para>
308 <command>find ... ;</command>: Fix permissions of documentation files
309 and directories.
310 </para>
311
312 <para>
313 <parameter>--enable-libfreetype</parameter>: Enables
314 <application>Freetype</application> support.
315 </para>
316
317 <para>
318 <parameter>--enable-gpl</parameter>: Enables the use of GPL code and
319 permits support for postprocessing, swscale and many other features.
320 </para>
321
322 <para>
323 <parameter>--enable-version3</parameter>: Enables the use of (L)GPL
324 version 3 code.
325 </para>
326
327 <para>
328 <parameter>--enable-nonfree</parameter>: Enables the use of nonfree code.
329 Note that the resulting libraries and binaries will be unredistributable.
330 </para>
331
332 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
333 href="../../xincludes/static-libraries.xml"/>
334
335 <para>
336 <parameter>--enable-shared</parameter>: Enables building shared
337 libraries, otherwise only static libraries are built and installed.
338 </para>
339
340 <para>
341 <parameter>--disable-debug</parameter>: Disables building debugging
342 symbols into the programs and libraries.
343 </para>
344
345 <para>
346 <parameter>--enable-avresample</parameter>: Enables
347 <xref linkend="transcode"/> to be compiled.
348 </para>
349
350 <para>
351 <parameter>--enable-libass</parameter>: Enables ASS/SSA subtitle format
352 rendering via <filename class="libraryfile">libass</filename>.
353 </para>
354
355 <para>
356 <parameter>--enable-libfdk-aac</parameter>: Enables currently the
357 highest-quality AAC audio encoding via <filename
358 class="libraryfile">libfdk-aac</filename>.
359 </para>
360
361 <para>
362 <parameter>--enable-libmp3lame</parameter>: Enables MP3 audio encoding
363 via <filename class="libraryfile">libmp3lame</filename>.
364 </para>
365
366 <para>
367 <parameter>--enable-libvorbis --enable-libtheora</parameter>: Enables
368 Theora video encoding via <filename
369 class="libraryfile">libvorbis</filename> and <filename
370 class="libraryfile">libtheora</filename>.
371 </para>
372
373 <para>
374 <parameter>--enable-libvorbis --enable-libvpx</parameter>: Enables WebM
375 encoding via <filename class="libraryfile">libvorbis</filename> and
376 <filename class="libraryfile">libvpx</filename>.
377 </para>
378
379 <para>
380 <parameter>--enable-libx264</parameter>: Enables high-quality
381 H.264/MPEG-4 AVC encoding via <filename
382 class="libraryfile">libx264</filename>.
383 </para>
384
385 <para>
386 <parameter>--enable-libx265</parameter>: Enables high-quality
387 H.265/HEVC encoding via <filename
388 class="libraryfile">libx265</filename>.
389 </para>
390
391 <para>
392 <option>--enable-openssl</option> or <option>--enable-gnutls</option>:
393 Enables HTTPS protocol for network streams.
394 </para>
395
396 <para>
397 <option>--disable-doc</option>: Disables building html documentation.
398 This is only needed if <xref linkend="doxygen"/> is installed and you
399 do not want to build the html documentation.
400 </para>
401
402 <para>
403 <option>--enable-libpulse</option>: Enables support for
404 <application>Pulseaudio</application> for audio output.
405 </para>
406
407 <para>
408 <command>gcc tools/qt-faststart.c -o tools/qt-faststart</command>: This
409 builds the <command>qt-faststart</command> program which can modify
410 QuickTime formatted movies (<filename class="extension">.mov</filename>
411 or <filename class="extension">.mp4</filename>) so that the header
412 information is located at the beginning of the file instead of the end.
413 This allows the movie file to begin playing before the entire file has
414 been downloaded.
415 </para>
416
417 <note>
418 <para>
419 Support for most of the dependency packages requires using options
420 passed to the <command>configure</command> script. View the output
421 from <command>./configure --help</command> for complete information
422 about enabling dependency packages.
423 </para>
424 </note>
425
426 </sect2>
427
428 <sect2 role="configuration">
429 <title>Configuring FFmpeg</title>
430
431 <sect3 id="ffmpeg-config">
432 <title>Config Files</title>
433
434 <para>
435 <filename>/etc/ffserver.conf</filename> and
436 <filename>~/.ffmpeg/ffserver-config</filename>
437 </para>
438
439 <indexterm zone="ffmpeg ffmpeg-config">
440 <primary
441 sortas="e-AA.ffmpeg-ffserver-config">~/.ffmpeg/ffserver-config</primary>
442 </indexterm>
443
444 <indexterm zone="ffmpeg ffmpeg-config">
445 <primary sortas="e-etc-ffserver.conf">/etc/ffserver.conf</primary>
446 </indexterm>
447
448 <para>
449 You'll find a sample <command>ffserver</command> configuration file at
450 <filename>doc/ffserver.conf</filename> in the source tree.
451 </para>
452
453 </sect3>
454
455 </sect2>
456
457 <sect2 role="content">
458 <title>Contents</title>
459
460 <segmentedlist>
461 <segtitle>Installed Programs</segtitle>
462 <segtitle>Installed Libraries</segtitle>
463 <segtitle>Installed Directories</segtitle>
464
465 <seglistitem>
466 <seg>
467 ffmpeg, ffplay, ffprobe, ffserver, and qt-faststart
468 </seg>
469 <seg>
470 libavcodec.so, libavdevice.so, libavfilter.so,
471 libavformat.so, libavutil.so, libpostproc.so,
472 libswresample.so, and libswscale.so
473 </seg>
474 <seg>
475 /usr/include/libav{codec,device,filter,format,util},
476 /usr/include/libpostproc,
477 /usr/include/libsw{resample,scale},
478 /usr/share/doc/ffmpeg-&ffmpeg-version;, and
479 /usr/share/ffmpeg
480 </seg>
481 </seglistitem>
482 </segmentedlist>
483
484 <variablelist>
485 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
486 <?dbfo list-presentation="list"?>
487 <?dbhtml list-presentation="table"?>
488
489 <varlistentry id="ffmpeg-prog">
490 <term><command>ffmpeg</command></term>
491 <listitem>
492 <para>
493 is a command-line tool to convert video files, network streams and
494 input from a TV card to several video formats.
495 </para>
496 <indexterm zone="ffmpeg ffmpeg-prog">
497 <primary sortas="b-ffmpeg">ffmpeg</primary>
498 </indexterm>
499 </listitem>
500 </varlistentry>
501
502 <varlistentry id="ffplay">
503 <term><command>ffplay</command></term>
504 <listitem>
505 <para>
506 is a very simple and portable media player using the
507 <filename>ffmpeg</filename> libraries and the SDL library.
508 </para>
509 <indexterm zone="ffmpeg ffplay">
510 <primary sortas="b-ffplay">ffplay</primary>
511 </indexterm>
512 </listitem>
513 </varlistentry>
514
515 <varlistentry id="ffprobe">
516 <term><command>ffprobe</command></term>
517 <listitem>
518 <para>
519 gathers information from multimedia streams and prints it in a human
520 and machine-readable fashion.
521 </para>
522 <indexterm zone="ffmpeg ffprobe">
523 <primary sortas="b-ffprobe">ffprobe</primary>
524 </indexterm>
525 </listitem>
526 </varlistentry>
527
528 <varlistentry id="ffserver">
529 <term><command>ffserver</command></term>
530 <listitem>
531 <para>
532 is a streaming server for everything that <command>ffmpeg</command>
533 could use as input (files, streams, TV card input, webcam, etc).
534 </para>
535 <indexterm zone="ffmpeg ffserver">
536 <primary sortas="b-ffserver">ffserver</primary>
537 </indexterm>
538 </listitem>
539 </varlistentry>
540
541 <varlistentry id="qt-faststart">
542 <term><command>qt-faststart</command></term>
543 <listitem>
544 <para>
545 moves the index file to the front of quicktime (mov/mp4) videos.
546 </para>
547 <indexterm zone="ffmpeg qt-faststart">
548 <primary sortas="b-qt-faststart">qt-faststart</primary>
549 </indexterm>
550 </listitem>
551 </varlistentry>
552
553 <varlistentry id="libavcodec">
554 <term><filename class="libraryfile">libavcodec.so</filename></term>
555 <listitem>
556 <para>
557 is a library containing the <application>FFmpeg</application> codecs
558 (both encoding and decoding).
559 </para>
560 <indexterm zone="ffmpeg libavcodec">
561 <primary sortas="c-libavcodec">libavcodec.so</primary>
562 </indexterm>
563 </listitem>
564 </varlistentry>
565
566 <varlistentry id="libavdevice">
567 <term><filename class="libraryfile">libavdevice.so</filename></term>
568 <listitem>
569 <para>
570 is the <application>FFmpeg</application> device handling library.
571 </para>
572 <indexterm zone="ffmpeg libavdevice">
573 <primary sortas="c-libavdevice">libavdevice.so</primary>
574 </indexterm>
575 </listitem>
576 </varlistentry>
577
578 <varlistentry id="libavfilter">
579 <term><filename class="libraryfile">libavfilter.so</filename></term>
580 <listitem>
581 <para>
582 is a library of filters that can alter video or audio between the
583 decoder and the encoder (or output).
584 </para>
585 <indexterm zone="ffmpeg libavfilter">
586 <primary sortas="c-libavfilter">libavfilter.so</primary>
587 </indexterm>
588 </listitem>
589 </varlistentry>
590
591 <varlistentry id="libavformat">
592 <term><filename class="libraryfile">libavformat.so</filename></term>
593 <listitem>
594 <para>
595 is a library containing the file formats handling (mux and demux
596 code for several formats) used by <command>ffplay</command> as well
597 as allowing the generation of audio or video streams.
598 </para>
599 <indexterm zone="ffmpeg libavformat">
600 <primary sortas="c-libavformat">libavformat.so</primary>
601 </indexterm>
602 </listitem>
603 </varlistentry>
604
605 <varlistentry id="libavutil">
606 <term><filename class="libraryfile">libavutil.so</filename></term>
607 <listitem>
608 <para>
609 is the <application>FFmpeg</application> utility library.
610 </para>
611 <indexterm zone="ffmpeg libavutil">
612 <primary sortas="c-libavutil">libavutil.so</primary>
613 </indexterm>
614 </listitem>
615 </varlistentry>
616
617 <varlistentry id="libpostproc">
618 <term><filename class="libraryfile">libpostproc.so</filename></term>
619 <listitem>
620 <para>
621 is the <application>FFmpeg</application> post processing library.
622 </para>
623 <indexterm zone="ffmpeg libpostproc">
624 <primary sortas="c-libpostproc">libpostproc.so</primary>
625 </indexterm>
626 </listitem>
627 </varlistentry>
628
629 <varlistentry id="libswresample">
630 <term><filename class="libraryfile">libswresample.so</filename></term>
631 <listitem>
632 <para>
633 is the <application>FFmpeg</application> audio rescaling library,
634 it contains functions for converting audio sample formats.
635 </para>
636 <indexterm zone="ffmpeg libswresample">
637 <primary sortas="c-libswresample">libswresample.so</primary>
638 </indexterm>
639 </listitem>
640 </varlistentry>
641
642 <varlistentry id="libswscale">
643 <term><filename class="libraryfile">libswscale.so</filename></term>
644 <listitem>
645 <para>
646 is the <application>FFmpeg</application> image rescaling library.
647 </para>
648 <indexterm zone="ffmpeg libswscale">
649 <primary sortas="c-libswscale">libswscale.so</primary>
650 </indexterm>
651 </listitem>
652 </varlistentry>
653
654 </variablelist>
655
656 </sect2>
657
658</sect1>
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