source: multimedia/videoutils/ffmpeg.xml@ a5dfb970

10.0 10.1 11.0 ken/refactor-virt lazarus qt5new trunk xry111/git-date xry111/git-date-for-trunk xry111/git-date-test
Last change on this file since a5dfb970 was a5dfb970, checked in by Xi Ruoyao <xry111@…>, 16 months ago

ffmpeg: add optional dependency libdrm and the configure option to use it

git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@23311 af4574ff-66df-0310-9fd7-8a98e5e911e0

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File size: 23.9 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="libdrm"/> (for <quote>kmsgrab</quote> input),
111 <xref linkend="libwebp"/>,
112 <xref linkend="opencv"/>,
113 <xref linkend="openjpeg2"/>,
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="https://gitlab.xiph.org/xiph/celt">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-avresample \
173 --enable-libass \
174 --enable-libfdk-aac \
175 --enable-libfreetype \
176 --enable-libmp3lame \
177 --enable-libopus \
178 --enable-libtheora \
179 --enable-libvorbis \
180 --enable-libvpx \
181 --enable-libx264 \
182 --enable-libx265 \
183 --docdir=/usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
184
185make &amp;&amp;
186
187gcc tools/qt-faststart.c -o tools/qt-faststart</userinput></screen>
188
189 <para>
190 HTML documentation was built in the previous step. If you have
191 <xref linkend="texlive"/> installed and wish to build PDF and
192 Postscript versions of the documentation, issue the following commands:
193 </para>
194
195<!-- sed -i '$s/$/\n\n@bye/' doc/{git-howto,nut,fate}.texi &amp;&amp;
196sed -i '/machine:i386/ s/\\/@backslashchar{}/g' doc/platform.texi &amp;&amp; -->
197<screen remap="doc"><userinput>pushd doc &amp;&amp;
198for DOCNAME in `basename -s .html *.html`
199do
200 texi2pdf -b $DOCNAME.texi &amp;&amp;
201 texi2dvi -b $DOCNAME.texi &amp;&amp;
202
203 dvips -o $DOCNAME.ps \
204 $DOCNAME.dvi
205done &amp;&amp;
206popd &amp;&amp;
207unset DOCNAME</userinput></screen>
208
209 <para>
210 If you have <xref linkend="doxygen"/> installed
211 and you wish to build (if --disable-doc was
212 used) or rebuild the html documentation, issue:
213 </para>
214
215<screen remap="doc"><userinput>doxygen doc/Doxyfile</userinput></screen>
216
217 <para>
218 The fate-suite tests include comparisons with installed files, and should
219 not be run before the package is installed. Therefore, if you desire to
220 run them, instructions are given further below.
221 </para>
222
223 <para>
224 Now, as the <systemitem class="username">root</systemitem> user:
225 </para>
226
227<screen role="root"><userinput>make install &amp;&amp;
228
229install -v -m755 tools/qt-faststart /usr/bin &amp;&amp;
230install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
231install -v -m644 doc/*.txt /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
232
233 <para>
234 If the PDF and Postscript documentation was built, issue the following
235 commands, as the <systemitem class="username">root</systemitem> user, to
236 install them:
237 </para>
238
239<screen role="root"
240 remap="doc"><userinput>install -v -m644 doc/*.pdf /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
241install -v -m644 doc/*.ps /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
242
243 <para>
244 If you used <command>doxygen</command> to manually create the API
245 documentation, install it by issuing the following commands
246 as the <systemitem class="username">root</systemitem> user:
247 </para>
248
249<screen role="root"
250 remap="doc"><userinput>install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
251cp -vr doc/doxy/html/* /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
252find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type f -exec chmod -c 0644 \{} \; &amp;&amp;
253find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type d -exec chmod -c 0755 \{} \;</userinput></screen>
254
255 <para>
256 To properly test the installation you must have <xref linkend="rsync"/>
257 installed and follow the instructions for the <ulink
258 url="http://www.ffmpeg.org/fate.html"> FFmpeg Automated Testing
259 Environment</ulink> (FATE). First, about 1 GB of sample files used to
260 run FATE are downloaded with the command:
261 </para>
262
263<screen remap="test"><userinput>make fate-rsync SAMPLES=fate-suite/</userinput></screen>
264
265 <para>
266 The <filename class="directory">fate-suite</filename> directory is
267 created and the files are downloaded there. That command actually runs an
268 rsync command, to obtain the sample files. You may want to compress and
269 keep this directory for testing again, in another system, or when a new
270 version of ffmpeg is launched. Then, you unpack the sample files in the
271 source directory, and run, again, the <command>make fate-rsync
272 ...</command> command above, to sync with the repository. Now, the
273 download size and time are drastically reduced. Estimated values in
274 "Package Information" do not include the download SBU. Some samples may
275 have been removed, in the new version, so, in order to be sure local and
276 server fate samples are identical, when you use previously saved samples,
277 run the following command:
278 </para>
279
280<screen role="nodump"><userinput>rsync -vrltLW --delete --timeout=60 --contimeout=60 \
281 rsync://fate-suite.ffmpeg.org/fate-suite/ fate-suite/</userinput></screen>
282
283 <para>
284 Next, FATE is executed, with the commands (you obtain a number of tests
285 larger than 3700):
286 </para>
287
288<screen remap="test"><userinput>make fate THREADS=<replaceable>N</replaceable> SAMPLES=fate-suite/ | tee ../fate.log &amp;&amp;
289grep ^TEST ../fate.log | wc -l</userinput></screen>
290
291 <para>
292 where <replaceable>N</replaceable> is an integer,
293 <replaceable>N</replaceable> &le; number of cores in the system.
294 </para>
295
296 </sect2>
297
298 <sect2 role="commands">
299 <title>Command Explanations</title>
300
301 <para>
302 <command>sed -i ... configure</command>: This command adds the
303 <application>ALSA</application> library to the
304 <application>Flite</application> <envar>LDFLAGS</envar> variable and
305 enables the discovery of <application>Flite</application>.
306 </para>
307
308 <para>
309 <command>find ... ;</command>: Fix permissions of documentation files
310 and directories.
311 </para>
312
313 <para>
314 <parameter>--enable-libfreetype</parameter>: Enables
315 <application>Freetype</application> support.
316 </para>
317
318 <para>
319 <parameter>--enable-gpl</parameter>: Enables the use of GPL code and
320 permits support for postprocessing, swscale and many other features.
321 </para>
322
323 <para>
324 <parameter>--enable-version3</parameter>: Enables the use of (L)GPL
325 version 3 code.
326 </para>
327
328 <para>
329 <parameter>--enable-nonfree</parameter>: Enables the use of nonfree code.
330 Note that the resulting libraries and binaries will be unredistributable.
331 </para>
332
333 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
334 href="../../xincludes/static-libraries.xml"/>
335
336 <para>
337 <parameter>--enable-shared</parameter>: Enables building shared
338 libraries, otherwise only static libraries are built and installed.
339 </para>
340
341 <para>
342 <parameter>--disable-debug</parameter>: Disables building debugging
343 symbols into the programs and libraries.
344 </para>
345
346 <para>
347 <parameter>--enable-avresample</parameter>: Enables
348 <xref linkend="transcode"/> to be compiled.
349 </para>
350
351 <para>
352 <parameter>--enable-libass</parameter>: Enables ASS/SSA subtitle format
353 rendering via <filename class="libraryfile">libass</filename>.
354 </para>
355
356 <para>
357 <option>--enable-libdrm</option>: Use it if <xref linkend="libdrm"/>
358 is installed, to build <quote>kmsgrab</quote> input module which is
359 useful for screen capturing or streaming.
360 </para>
361
362 <para>
363 <parameter>--enable-libfdk-aac</parameter>: Enables currently the
364 highest-quality AAC audio encoding via <filename
365 class="libraryfile">libfdk-aac</filename>.
366 </para>
367
368 <para>
369 <parameter>--enable-libmp3lame</parameter>: Enables MP3 audio encoding
370 via <filename class="libraryfile">libmp3lame</filename>.
371 </para>
372
373 <para>
374 <parameter>--enable-libvorbis --enable-libtheora</parameter>: Enables
375 Theora video encoding via <filename
376 class="libraryfile">libvorbis</filename> and <filename
377 class="libraryfile">libtheora</filename>.
378 </para>
379
380 <para>
381 <parameter>--enable-libvorbis --enable-libvpx</parameter>: Enables WebM
382 encoding via <filename class="libraryfile">libvorbis</filename> and
383 <filename class="libraryfile">libvpx</filename>.
384 </para>
385
386 <para>
387 <parameter>--enable-libx264</parameter>: Enables high-quality
388 H.264/MPEG-4 AVC encoding via <filename
389 class="libraryfile">libx264</filename>.
390 </para>
391
392 <para>
393 <parameter>--enable-libx265</parameter>: Enables high-quality
394 H.265/HEVC encoding via <filename
395 class="libraryfile">libx265</filename>.
396 </para>
397
398 <para>
399 <option>--enable-openssl</option> or <option>--enable-gnutls</option>:
400 Enables HTTPS protocol for network streams.
401 </para>
402
403 <para>
404 <option>--disable-doc</option>: Disables building html documentation.
405 This is only needed if <xref linkend="doxygen"/> is installed and you
406 do not want to build the html documentation.
407 </para>
408
409 <para>
410 <option>--enable-libpulse</option>: Enables support for
411 <application>Pulseaudio</application> for audio output.
412 </para>
413
414 <para>
415 <command>gcc tools/qt-faststart.c -o tools/qt-faststart</command>: This
416 builds the <command>qt-faststart</command> program which can modify
417 QuickTime formatted movies (<filename class="extension">.mov</filename>
418 or <filename class="extension">.mp4</filename>) so that the header
419 information is located at the beginning of the file instead of the end.
420 This allows the movie file to begin playing before the entire file has
421 been downloaded.
422 </para>
423
424 <note>
425 <para>
426 Support for most of the dependency packages requires using options
427 passed to the <command>configure</command> script. View the output
428 from <command>./configure --help</command> for complete information
429 about enabling dependency packages.
430 </para>
431 </note>
432
433 </sect2>
434
435 <sect2 role="configuration">
436 <title>Configuring FFmpeg</title>
437
438 <sect3 id="ffmpeg-config">
439 <title>Config Files</title>
440
441 <para>
442 <filename>/etc/ffserver.conf</filename> and
443 <filename>~/.ffmpeg/ffserver-config</filename>
444 </para>
445
446 <indexterm zone="ffmpeg ffmpeg-config">
447 <primary
448 sortas="e-AA.ffmpeg-ffserver-config">~/.ffmpeg/ffserver-config</primary>
449 </indexterm>
450
451 <indexterm zone="ffmpeg ffmpeg-config">
452 <primary sortas="e-etc-ffserver.conf">/etc/ffserver.conf</primary>
453 </indexterm>
454
455 <para>
456 You'll find a sample <command>ffserver</command> configuration file at
457 <filename>doc/ffserver.conf</filename> in the source tree.
458 </para>
459
460 </sect3>
461
462 </sect2>
463
464 <sect2 role="content">
465 <title>Contents</title>
466
467 <segmentedlist>
468 <segtitle>Installed Programs</segtitle>
469 <segtitle>Installed Libraries</segtitle>
470 <segtitle>Installed Directories</segtitle>
471
472 <seglistitem>
473 <seg>
474 ffmpeg, ffplay, ffprobe, ffserver, and qt-faststart
475 </seg>
476 <seg>
477 libavcodec.so, libavdevice.so, libavfilter.so,
478 libavformat.so, libavutil.so, libpostproc.so,
479 libswresample.so, and libswscale.so
480 </seg>
481 <seg>
482 /usr/include/libav{codec,device,filter,format,util},
483 /usr/include/libpostproc,
484 /usr/include/libsw{resample,scale},
485 /usr/share/doc/ffmpeg-&ffmpeg-version;, and
486 /usr/share/ffmpeg
487 </seg>
488 </seglistitem>
489 </segmentedlist>
490
491 <variablelist>
492 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
493 <?dbfo list-presentation="list"?>
494 <?dbhtml list-presentation="table"?>
495
496 <varlistentry id="ffmpeg-prog">
497 <term><command>ffmpeg</command></term>
498 <listitem>
499 <para>
500 is a command-line tool to convert video files, network streams and
501 input from a TV card to several video formats.
502 </para>
503 <indexterm zone="ffmpeg ffmpeg-prog">
504 <primary sortas="b-ffmpeg">ffmpeg</primary>
505 </indexterm>
506 </listitem>
507 </varlistentry>
508
509 <varlistentry id="ffplay">
510 <term><command>ffplay</command></term>
511 <listitem>
512 <para>
513 is a very simple and portable media player using the
514 <filename>ffmpeg</filename> libraries and the SDL library.
515 </para>
516 <indexterm zone="ffmpeg ffplay">
517 <primary sortas="b-ffplay">ffplay</primary>
518 </indexterm>
519 </listitem>
520 </varlistentry>
521
522 <varlistentry id="ffprobe">
523 <term><command>ffprobe</command></term>
524 <listitem>
525 <para>
526 gathers information from multimedia streams and prints it in a human
527 and machine-readable fashion.
528 </para>
529 <indexterm zone="ffmpeg ffprobe">
530 <primary sortas="b-ffprobe">ffprobe</primary>
531 </indexterm>
532 </listitem>
533 </varlistentry>
534
535 <varlistentry id="ffserver">
536 <term><command>ffserver</command></term>
537 <listitem>
538 <para>
539 is a streaming server for everything that <command>ffmpeg</command>
540 could use as input (files, streams, TV card input, webcam, etc).
541 </para>
542 <indexterm zone="ffmpeg ffserver">
543 <primary sortas="b-ffserver">ffserver</primary>
544 </indexterm>
545 </listitem>
546 </varlistentry>
547
548 <varlistentry id="qt-faststart">
549 <term><command>qt-faststart</command></term>
550 <listitem>
551 <para>
552 moves the index file to the front of quicktime (mov/mp4) videos.
553 </para>
554 <indexterm zone="ffmpeg qt-faststart">
555 <primary sortas="b-qt-faststart">qt-faststart</primary>
556 </indexterm>
557 </listitem>
558 </varlistentry>
559
560 <varlistentry id="libavcodec">
561 <term><filename class="libraryfile">libavcodec.so</filename></term>
562 <listitem>
563 <para>
564 is a library containing the <application>FFmpeg</application> codecs
565 (both encoding and decoding).
566 </para>
567 <indexterm zone="ffmpeg libavcodec">
568 <primary sortas="c-libavcodec">libavcodec.so</primary>
569 </indexterm>
570 </listitem>
571 </varlistentry>
572
573 <varlistentry id="libavdevice">
574 <term><filename class="libraryfile">libavdevice.so</filename></term>
575 <listitem>
576 <para>
577 is the <application>FFmpeg</application> device handling library.
578 </para>
579 <indexterm zone="ffmpeg libavdevice">
580 <primary sortas="c-libavdevice">libavdevice.so</primary>
581 </indexterm>
582 </listitem>
583 </varlistentry>
584
585 <varlistentry id="libavfilter">
586 <term><filename class="libraryfile">libavfilter.so</filename></term>
587 <listitem>
588 <para>
589 is a library of filters that can alter video or audio between the
590 decoder and the encoder (or output).
591 </para>
592 <indexterm zone="ffmpeg libavfilter">
593 <primary sortas="c-libavfilter">libavfilter.so</primary>
594 </indexterm>
595 </listitem>
596 </varlistentry>
597
598 <varlistentry id="libavformat">
599 <term><filename class="libraryfile">libavformat.so</filename></term>
600 <listitem>
601 <para>
602 is a library containing the file formats handling (mux and demux
603 code for several formats) used by <command>ffplay</command> as well
604 as allowing the generation of audio or video streams.
605 </para>
606 <indexterm zone="ffmpeg libavformat">
607 <primary sortas="c-libavformat">libavformat.so</primary>
608 </indexterm>
609 </listitem>
610 </varlistentry>
611
612 <varlistentry id="libavutil">
613 <term><filename class="libraryfile">libavutil.so</filename></term>
614 <listitem>
615 <para>
616 is the <application>FFmpeg</application> utility library.
617 </para>
618 <indexterm zone="ffmpeg libavutil">
619 <primary sortas="c-libavutil">libavutil.so</primary>
620 </indexterm>
621 </listitem>
622 </varlistentry>
623
624 <varlistentry id="libpostproc">
625 <term><filename class="libraryfile">libpostproc.so</filename></term>
626 <listitem>
627 <para>
628 is the <application>FFmpeg</application> post processing library.
629 </para>
630 <indexterm zone="ffmpeg libpostproc">
631 <primary sortas="c-libpostproc">libpostproc.so</primary>
632 </indexterm>
633 </listitem>
634 </varlistentry>
635
636 <varlistentry id="libswresample">
637 <term><filename class="libraryfile">libswresample.so</filename></term>
638 <listitem>
639 <para>
640 is the <application>FFmpeg</application> audio rescaling library,
641 it contains functions for converting audio sample formats.
642 </para>
643 <indexterm zone="ffmpeg libswresample">
644 <primary sortas="c-libswresample">libswresample.so</primary>
645 </indexterm>
646 </listitem>
647 </varlistentry>
648
649 <varlistentry id="libswscale">
650 <term><filename class="libraryfile">libswscale.so</filename></term>
651 <listitem>
652 <para>
653 is the <application>FFmpeg</application> image rescaling library.
654 </para>
655 <indexterm zone="ffmpeg libswscale">
656 <primary sortas="c-libswscale">libswscale.so</primary>
657 </indexterm>
658 </listitem>
659 </varlistentry>
660
661 </variablelist>
662
663 </sect2>
664
665</sect1>
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