source: multimedia/videoutils/ffmpeg.xml@ 94b42903

10.0 10.1 11.0 11.1 11.2 11.3 12.0 12.1 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 94b42903 was 94b42903, checked in by Bruce Dubbs <bdubbs@…>, 6 years ago

Archive openssl-1.1.x. Moved to LFS.
Update to v4l-utils-1.14.2.
Update to vlc-3.0.0.

git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@19748 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 "726212db1b8a7eff6c25a2bc2e6fa75c">
10 <!ENTITY ffmpeg-size "8.1 MB">
11 <!ENTITY ffmpeg-buildsize "137 MB (add 2.7 GB for the FATE suite/tests, add 17 MB for docs)">
12 <!ENTITY ffmpeg-time "1.4 SBU (using parallelism=4; 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 &lfs81_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="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="http://www.celt-codec.org/">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-libass \
172 --enable-libfdk-aac \
173 --enable-libfreetype \
174 --enable-libmp3lame \
175 --enable-libopus \
176 --enable-libtheora \
177 --enable-libvorbis \
178 --enable-libvpx \
179 --enable-libx264 \
180 --enable-libx265 \
181 --docdir=/usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
182
183make &amp;&amp;
184
185gcc tools/qt-faststart.c -o tools/qt-faststart</userinput></screen>
186
187 <para>
188 HTML documentation was built in the previous step. If you have
189 <xref linkend="texlive"/> installed and wish to build PDF and
190 Postscript versions of the documentation, issue the following commands:
191 </para>
192
193<!-- sed -i '$s/$/\n\n@bye/' doc/{git-howto,nut,fate}.texi &amp;&amp;
194sed -i '/machine:i386/ s/\\/@backslashchar{}/g' doc/platform.texi &amp;&amp; -->
195<screen><userinput>pushd doc &amp;&amp;
196for DOCNAME in `basename -s .html *.html`
197do
198 texi2pdf -b $DOCNAME.texi &amp;&amp;
199 texi2dvi -b $DOCNAME.texi &amp;&amp;
200
201 dvips -o $DOCNAME.ps \
202 $DOCNAME.dvi
203done &amp;&amp;
204popd &amp;&amp;
205unset DOCNAME</userinput></screen>
206
207 <para>
208 If you have <xref linkend="doxygen"/> installed
209 and you wish to build (if --disable-doc was
210 used) or rebuild the html documentation, issue the command
211 <command>doxygen doc/Doxyfile</command>.
212 </para>
213
214 <para>
215 The fate-suite tests include comparisons with installed files, and should
216 not be run before the package is installed. Therefore, if you desire to
217 run them, instructions are given further below.
218 </para>
219
220 <para>
221 Now, as the <systemitem class="username">root</systemitem> user:
222 </para>
223
224<screen role="root"><userinput>make install &amp;&amp;
225
226install -v -m755 tools/qt-faststart /usr/bin &amp;&amp;
227install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
228install -v -m644 doc/*.txt /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
229
230 <para>
231 If the PDF and Postscript documentation was built, issue the following
232 commands, as the <systemitem class="username">root</systemitem> user, to
233 install them:
234 </para>
235
236<screen role="root"><userinput>install -v -m644 doc/*.pdf /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
237install -v -m644 doc/*.ps /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
238
239 <para>
240 If you used <command>doxygen</command> to manually create the API
241 documentation, install it by issuing the following commands
242 as the <systemitem class="username">root</systemitem> user:
243 </para>
244
245<screen role="root"><userinput>install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
246cp -vr doc/doxy/html/* /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
247find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type f -exec chmod -c 0644 \{} \; &amp;&amp;
248find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type d -exec chmod -c 0755 \{} \;</userinput></screen>
249
250 <para>
251 To properly test the installation you must have <xref linkend="rsync"/>
252 installed and follow the instructions for the <ulink
253 url="http://www.ffmpeg.org/fate.html"> FFmpeg Automated Testing
254 Environment</ulink> (FATE). First, about 1 GB of sample files used to
255 run FATE are downloaded with the command:
256 </para>
257
258<screen><userinput>make fate-rsync SAMPLES=fate-suite/</userinput></screen>
259
260 <para>
261 The <filename class="directory">fate-suite</filename> directory is
262 created and the files are downloaded there. That command actually runs an
263 rsync command, to obtain the sample files. You may want to compress and
264 keep this directory for testing again, in another system, or when a new
265 version of ffmpeg is launched. Then, you unpack the sample files in the
266 source directory, and run, again, the <command>make fate-rsync
267 ...</command> command above, to sync with the repository. Now, the
268 download size and time are drastically reduced. Estimated values in
269 "Package Information" do not include the download SBU. Some samples may
270 have been removed, in the new version, so, in order to be sure local and
271 server fate samples are identical, when you use previously saved samples,
272 run the following command:
273 </para>
274
275<screen><userinput><command>rsync -vrltLW --delete --timeout=60 --contimeout=60 \
276 rsync://fate-suite.ffmpeg.org/fate-suite/ fate-suite/</command></userinput></screen>
277
278 <para>
279 Next, FATE is executed, with the commands (you obtain a number of tests
280 larger than 3000):
281 </para>
282
283<screen><userinput>make fate THREADS=<replaceable>N</replaceable> SAMPLES=fate-suite/ | tee ../fate.log &amp;&amp;
284grep ^TEST ../fate.log | wc -l</userinput></screen>
285
286 <para>
287 where <replaceable>N</replaceable> is an integer,
288 <replaceable>N</replaceable> &le; number of cores in the system.
289 </para>
290
291 </sect2>
292
293 <sect2 role="commands">
294 <title>Command Explanations</title>
295
296 <para>
297 <command>sed -i ... configure</command>: This command adds the
298 <application>ALSA</application> library to the
299 <application>Flite</application> <envar>LDFLAGS</envar> variable and
300 enables the discovery of <application>Flite</application>.
301 </para>
302
303 <para>
304 <command>find ... ;</command>: Fix permissions of documentation files
305 and directories.
306 </para>
307
308 <para>
309 <parameter>--enable-libfreetype</parameter>: Enables
310 <application>Freetype</application> support.
311 </para>
312
313 <para>
314 <parameter>--enable-gpl</parameter>: Enables the use of GPL code and
315 permits support for postprocessing, swscale and many other features.
316 </para>
317
318 <para>
319 <parameter>--enable-version3</parameter>: Enables the use of (L)GPL
320 version 3 code.
321 </para>
322
323 <para>
324 <parameter>--enable-nonfree</parameter>: Enables the use of nonfree code.
325 Note that the resulting libraries and binaries will be unredistributable.
326 </para>
327
328 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
329 href="../../xincludes/static-libraries.xml"/>
330
331 <para>
332 <parameter>--enable-shared</parameter>: Enables building shared
333 libraries, otherwise only static libraries are built and installed.
334 </para>
335
336 <para>
337 <parameter>--disable-debug</parameter>: Disables building debugging
338 symbols into the programs and libraries.
339 </para>
340
341 <para>
342 <parameter>--enable-libass</parameter>: Enables ASS/SSA subtitle format
343 rendering via <filename class="libraryfile">libass</filename>.
344 </para>
345
346 <para>
347 <parameter>--enable-libfdk-aac</parameter>: Enables currently the
348 highest-quality AAC audio encoding via <filename
349 class="libraryfile">libfdk-aac</filename>.
350 </para>
351
352 <para>
353 <parameter>--enable-libmp3lame</parameter>: Enables MP3 audio encoding
354 via <filename class="libraryfile">libmp3lame</filename>.
355 </para>
356
357 <para>
358 <parameter>--enable-libvorbis --enable-libtheora</parameter>: Enables
359 Theora video encoding via <filename
360 class="libraryfile">libvorbis</filename> and <filename
361 class="libraryfile">libtheora</filename>.
362 </para>
363
364 <para>
365 <parameter>--enable-libvorbis --enable-libvpx</parameter>: Enables WebM
366 encoding via <filename class="libraryfile">libvorbis</filename> and
367 <filename class="libraryfile">libvpx</filename>.
368 </para>
369
370 <para>
371 <parameter>--enable-libx264</parameter>: Enables high-quality
372 H.264/MPEG-4 AVC encoding via <filename
373 class="libraryfile">libx264</filename>.
374 </para>
375
376 <para>
377 <parameter>--enable-libx265</parameter>: Enables high-quality
378 H.265/HEVC encoding via <filename
379 class="libraryfile">libx265</filename>.
380 </para>
381
382 <para>
383 <option>--enable-openssl</option> or <option>--enable-gnutls</option>:
384 Enables HTTPS protocol for network streams.
385 </para>
386
387 <para>
388 <option>--disable-doc</option>: Disables building html documentation.
389 This is only needed if <xref linkend="doxygen"/> is installed and you
390 do not want to build the html documentation.
391 </para>
392
393 <para>
394 <command>gcc tools/qt-faststart.c -o tools/qt-faststart</command>: This
395 builds the <command>qt-faststart</command> program which can modify
396 QuickTime formatted movies (<filename class="extension">.mov</filename>
397 or <filename class="extension">.mp4</filename>) so that the header
398 information is located at the beginning of the file instead of the end.
399 This allows the movie file to begin playing before the entire file has
400 been downloaded.
401 </para>
402
403 <note>
404 <para>
405 Support for most of the dependency packages requires using options
406 passed to the <command>configure</command> script. View the output
407 from <command>./configure --help</command> for complete information
408 about enabling dependency packages.
409 </para>
410 </note>
411
412 </sect2>
413
414 <sect2 role="configuration">
415 <title>Configuring FFmpeg</title>
416
417 <sect3 id="ffmpeg-config">
418 <title>Config Files</title>
419
420 <para>
421 <filename>/etc/ffserver.conf</filename> and
422 <filename>~/.ffmpeg/ffserver-config</filename>
423 </para>
424
425 <indexterm zone="ffmpeg ffmpeg-config">
426 <primary
427 sortas="e-AA.ffmpeg-ffserver-config">~/.ffmpeg/ffserver-config</primary>
428 </indexterm>
429
430 <indexterm zone="ffmpeg ffmpeg-config">
431 <primary sortas="e-etc-ffserver.conf">/etc/ffserver.conf</primary>
432 </indexterm>
433
434 <para>
435 You'll find a sample <command>ffserver</command> configuration file at
436 <filename>doc/ffserver.conf</filename> in the source tree.
437 </para>
438
439 </sect3>
440
441 </sect2>
442
443 <sect2 role="content">
444 <title>Contents</title>
445
446 <segmentedlist>
447 <segtitle>Installed Programs</segtitle>
448 <segtitle>Installed Libraries</segtitle>
449 <segtitle>Installed Directories</segtitle>
450
451 <seglistitem>
452 <seg>
453 ffmpeg, ffplay, ffprobe, ffserver, and qt-faststart
454 </seg>
455 <seg>
456 libavcodec.so, libavdevice.so, libavfilter.so,
457 libavformat.so, libavutil.so, libpostproc.so,
458 libswresample.so, and libswscale.so
459 </seg>
460 <seg>
461 /usr/include/libav{codec,device,filter,format,util},
462 /usr/include/libpostproc,
463 /usr/include/libsw{resample,scale},
464 /usr/share/doc/ffmpeg-&ffmpeg-version;, and
465 /usr/share/ffmpeg
466 </seg>
467 </seglistitem>
468 </segmentedlist>
469
470 <variablelist>
471 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
472 <?dbfo list-presentation="list"?>
473 <?dbhtml list-presentation="table"?>
474
475 <varlistentry id="ffmpeg-prog">
476 <term><command>ffmpeg</command></term>
477 <listitem>
478 <para>
479 is a command-line tool to convert video files, network streams and
480 input from a TV card to several video formats.
481 </para>
482 <indexterm zone="ffmpeg ffmpeg-prog">
483 <primary sortas="b-ffmpeg">ffmpeg</primary>
484 </indexterm>
485 </listitem>
486 </varlistentry>
487
488 <varlistentry id="ffplay">
489 <term><command>ffplay</command></term>
490 <listitem>
491 <para>
492 is a very simple and portable media player using the
493 <filename>ffmpeg</filename> libraries and the SDL library.
494 </para>
495 <indexterm zone="ffmpeg ffplay">
496 <primary sortas="b-ffplay">ffplay</primary>
497 </indexterm>
498 </listitem>
499 </varlistentry>
500
501 <varlistentry id="ffprobe">
502 <term><command>ffprobe</command></term>
503 <listitem>
504 <para>
505 gathers information from multimedia streams and prints it in a human
506 and machine-readable fashion.
507 </para>
508 <indexterm zone="ffmpeg ffprobe">
509 <primary sortas="b-ffprobe">ffprobe</primary>
510 </indexterm>
511 </listitem>
512 </varlistentry>
513
514 <varlistentry id="ffserver">
515 <term><command>ffserver</command></term>
516 <listitem>
517 <para>
518 is a streaming server for everything that <command>ffmpeg</command>
519 could use as input (files, streams, TV card input, webcam, etc).
520 </para>
521 <indexterm zone="ffmpeg ffserver">
522 <primary sortas="b-ffserver">ffserver</primary>
523 </indexterm>
524 </listitem>
525 </varlistentry>
526
527 <varlistentry id="qt-faststart">
528 <term><command>qt-faststart</command></term>
529 <listitem>
530 <para>
531 moves the index file to the front of quicktime (mov/mp4) videos.
532 </para>
533 <indexterm zone="ffmpeg qt-faststart">
534 <primary sortas="b-qt-faststart">qt-faststart</primary>
535 </indexterm>
536 </listitem>
537 </varlistentry>
538
539 <varlistentry id="libavcodec">
540 <term><filename class="libraryfile">libavcodec.so</filename></term>
541 <listitem>
542 <para>
543 is a library containing the <application>FFmpeg</application> codecs
544 (both encoding and decoding).
545 </para>
546 <indexterm zone="ffmpeg libavcodec">
547 <primary sortas="c-libavcodec">libavcodec.so</primary>
548 </indexterm>
549 </listitem>
550 </varlistentry>
551
552 <varlistentry id="libavdevice">
553 <term><filename class="libraryfile">libavdevice.so</filename></term>
554 <listitem>
555 <para>
556 is the <application>FFmpeg</application> device handling library.
557 </para>
558 <indexterm zone="ffmpeg libavdevice">
559 <primary sortas="c-libavdevice">libavdevice.so</primary>
560 </indexterm>
561 </listitem>
562 </varlistentry>
563
564 <varlistentry id="libavfilter">
565 <term><filename class="libraryfile">libavfilter.so</filename></term>
566 <listitem>
567 <para>
568 is a library of filters that can alter video or audio between the
569 decoder and the encoder (or output).
570 </para>
571 <indexterm zone="ffmpeg libavfilter">
572 <primary sortas="c-libavfilter">libavfilter.so</primary>
573 </indexterm>
574 </listitem>
575 </varlistentry>
576
577 <varlistentry id="libavformat">
578 <term><filename class="libraryfile">libavformat.so</filename></term>
579 <listitem>
580 <para>
581 is a library containing the file formats handling (mux and demux
582 code for several formats) used by <command>ffplay</command> as well
583 as allowing the generation of audio or video streams.
584 </para>
585 <indexterm zone="ffmpeg libavformat">
586 <primary sortas="c-libavformat">libavformat.so</primary>
587 </indexterm>
588 </listitem>
589 </varlistentry>
590
591 <varlistentry id="libavutil">
592 <term><filename class="libraryfile">libavutil.so</filename></term>
593 <listitem>
594 <para>
595 is the <application>FFmpeg</application> utility library.
596 </para>
597 <indexterm zone="ffmpeg libavutil">
598 <primary sortas="c-libavutil">libavutil.so</primary>
599 </indexterm>
600 </listitem>
601 </varlistentry>
602
603 <varlistentry id="libpostproc">
604 <term><filename class="libraryfile">libpostproc.so</filename></term>
605 <listitem>
606 <para>
607 is the <application>FFmpeg</application> post processing library.
608 </para>
609 <indexterm zone="ffmpeg libpostproc">
610 <primary sortas="c-libpostproc">libpostproc.so</primary>
611 </indexterm>
612 </listitem>
613 </varlistentry>
614
615 <varlistentry id="libswresample">
616 <term><filename class="libraryfile">libswresample.so</filename></term>
617 <listitem>
618 <para>
619 is the <application>FFmpeg</application> audio rescaling library,
620 it contains functions for converting audio sample formats.
621 </para>
622 <indexterm zone="ffmpeg libswresample">
623 <primary sortas="c-libswresample">libswresample.so</primary>
624 </indexterm>
625 </listitem>
626 </varlistentry>
627
628 <varlistentry id="libswscale">
629 <term><filename class="libraryfile">libswscale.so</filename></term>
630 <listitem>
631 <para>
632 is the <application>FFmpeg</application> image rescaling library.
633 </para>
634 <indexterm zone="ffmpeg libswscale">
635 <primary sortas="c-libswscale">libswscale.so</primary>
636 </indexterm>
637 </listitem>
638 </varlistentry>
639
640 </variablelist>
641
642 </sect2>
643
644</sect1>
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