source: multimedia/videoutils/ffmpeg.xml@ 2adbd3da

10.0 10.1 11.0 11.1 11.2 11.3 12.0 12.1 7.10 7.7 7.8 7.9 8.0 8.1 8.2 8.3 8.4 9.0 9.1 basic bdubbs/svn elogind kea ken/TL2024 ken/inkscape-core-mods ken/tuningfonts lazarus lxqt nosym perl-modules plabs/newcss plabs/python-mods python3.11 qt5new rahul/power-profiles-daemon renodr/vulkan-addition trunk upgradedb xry111/intltool xry111/llvm18 xry111/soup3 xry111/test-20220226 xry111/xf86-video-removal
Last change on this file since 2adbd3da was 2adbd3da, checked in by Fernando de Oliveira <fernando@…>, 9 years ago

Update to ffmpeg-2.4.3.

git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@14833 af4574ff-66df-0310-9fd7-8a98e5e911e0

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File size: 22.9 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.bz2">
8 <!ENTITY ffmpeg-download-ftp " ">
9 <!ENTITY ffmpeg-md5sum "8da635baff57d7ab704b1daca5a99b47">
10 <!ENTITY ffmpeg-size "7.1 MB">
11 <!ENTITY ffmpeg-buildsize "130 MB (additional 1737 MB for docs and 1908 MB to run the FATE tests)">
12 <!ENTITY ffmpeg-time "3.8 SBU (additional 2.8 SBU for docs and 6.0 SBU to run the FATE tests, after sample files are downloaded)">
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 &lfs76_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="yasm"/>,
85 <xref linkend="libass"/>,
86 <xref linkend="fdk-aac"/>,
87 <xref linkend="lame"/>,
88 <xref linkend="libtheora"/>,
89 <xref linkend="libvorbis"/>,
90 <xref linkend="libvpx"/>, and
91 <xref linkend="x264"/>
92 </para>
93
94 <bridgehead renderas="sect4">Recommended for desktop use</bridgehead>
95 <para>
96 <xref linkend="x-window-system"/>,
97 <xref linkend="alsa-lib"/>,
98 <xref linkend="sdl"/>,
99 <xref linkend="libva"/> and
100 <xref linkend="libvdpau"/> (with the corresponding driver package)
101 </para>
102
103 <bridgehead renderas="sect4">Optional</bridgehead>
104 <para role="optional">
105 <xref linkend="faac"/>,
106 <xref linkend="freetype2"/>,
107 <xref linkend="libwebp"/>,
108 <xref linkend="openjpeg"/>,
109 <xref linkend="pulseaudio"/>,
110 <xref linkend="speex"/>,
111 <xref linkend="xvid"/>,
112 <xref linkend="openssl"/>,
113 <xref linkend="fontconfig"/>,
114 <xref linkend="gnutls"/>,
115 <xref linkend="opus"/>,
116<!-- <ulink url="http://www.piksel.org/frei0r">frei0r</ulink>,-->
117 <ulink url="https://files.dyne.org/frei0r/snapshots/">frei0r</ulink>,
118 <ulink url="http://xhevc.com/en/hevc/decoder/download.jsp">HEVC/H.265</ulink>,
119 <ulink url="http://www.ladspa.org/">LADSPA</ulink>,
120 <ulink url="http://www.libssh.org/">libssh</ulink>,
121 <ulink url="http://zapping.sourceforge.net/ZVBI/">ZVBI</ulink>,
122 <ulink url="http://tipok.org.ua/node/17">libaacplus</ulink>,
123 <ulink url="http://www.videolan.org/developers/libbluray.html">libbluray</ulink>,
124 <ulink url="http://caca.zoy.org/">libcaca</ulink>,
125 <ulink url="http://www.celt-codec.org/">libcelt</ulink>,
126 <ulink url="http://ftp.gnu.org/pub/gnu/libcdio/">libcdio</ulink>,
127 <ulink url="http://sourceforge.net/projects/libdc1394">libdc1394</ulink>,
128 <ulink url="http://www.speech.cs.cmu.edu/flite/">Flite</ulink>,
129 <ulink url="http://www.quut.com/gsm/">GSM</ulink>,
130 <ulink url="https://ieee1394.wiki.kernel.org/index.php/Libraries">libiec61883</ulink>,
131 <ulink url="https://github.com/dekkers/libilbc">libilbc</ulink>,
132 <ulink url="http://sourceforge.net/projects/modplug-xmms/">libmodplug</ulink>,
133 <ulink url="https://github.com/Distrotech/libnut">libnut</ulink> (Git checkout),
134 <ulink url="http://sourceforge.net/projects/opencore-amr">OpenCore AMR</ulink>,
135 <ulink url="http://opencv.org/">OpenCV</ulink>,
136 <ulink url="http://rtmpdump.mplayerhq.hu/">librtmp</ulink>,
137 <ulink url="http://diracvideo.org/">Schroedinger</ulink>,
138 <ulink url="http://www.twolame.org/">TwoLAME</ulink>,
139 <ulink url="http://linuxtv.org/downloads/v4l-utils/">Video4Linux</ulink>,
140 <ulink url="http://sourceforge.net/projects/opencore-amr/files/vo-aacenc/">vo-aaenc</ulink>,
141 <ulink url="http://sourceforge.net/projects/opencore-amr/files/vo-amrwbenc/">vo-amrwbenc</ulink>,
142 <ulink url="http://xavs.sourceforge.net/">libxavs</ulink> (SVN checkout),
143 <ulink url="http://kcat.strangesoft.net/openal-releases/">OpenAL</ulink>, and
144 <ulink url="http://www.videolan.org/developers/x265.html">x265 (H.265/MPEG-H HEVC)</ulink>
145 </para>
146
147 <para condition="html" role="usernotes">
148 User Notes: <ulink url="&blfs-wiki;/ffmpeg"/>
149 </para>
150 </sect2>
151
152 <sect2 role="installation">
153 <title>Installation of FFmpeg</title>
154
155<!--<para>
156 If <application>Xorg</application> is installed in a prefix other
157 than <filename class='directory'>/usr</filename>, the build will fail. Fix
158 this by issuing the following command:
159 </para>
160
161<screen><userinput>export LIBRARY_PATH=$XORG_PREFIX/lib</userinput></screen>
162-->
163 <para>
164 Install <application>FFmpeg</application> by running the following
165 commands:
166 </para>
167
168<screen><userinput>sed -i 's/-lflite"/-lflite -lasound"/' configure &amp;&amp;
169./configure --prefix=/usr \
170 --enable-gpl \
171 --enable-version3 \
172 --enable-nonfree \
173 --disable-static \
174 --enable-shared \
175 --disable-debug \
176 --enable-libass \
177 --enable-libfdk-aac \
178 --enable-libmp3lame \
179 --enable-libtheora \
180 --enable-libvorbis \
181 --enable-libvpx \
182 --enable-libx264 \
183 --enable-x11grab \
184 --docdir=/usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
185make &amp;&amp;
186gcc tools/qt-faststart.c -o tools/qt-faststart</userinput></screen>
187<!--
188unset LIBRARY_PATH</userinput></screen>-->
189
190 <para>
191 HTML documentation was built in the previous step. If you have
192 <xref linkend="texlive"/> installed and wish to build PDF and
193 Postscript versions of the documentation, issue the following commands:
194 </para>
195
196<screen><userinput>sed -i '$s/$/\n\n@bye/' doc/{git-howto,nut,fate}.texi &amp;&amp;
197sed -i '/machine:i386/ s/\\/@backslashchar{}/g' doc/platform.texi &amp;&amp;
198
199pushd doc &amp;&amp;
200for DOCNAME in `basename -s .html *.html`
201do
202 texi2pdf -b $DOCNAME.texi &amp;&amp;
203 texi2dvi -b $DOCNAME.texi &amp;&amp;
204 dvips -o $DOCNAME.ps \
205 $DOCNAME.dvi
206done &amp;&amp;
207popd &amp;&amp;
208unset DOCNAME</userinput></screen>
209
210 <para>
211 If you have <xref linkend="doxygen"/> installed and wish to create the API
212 documentation (takes about 350 MB of space), issue the command
213 <command>doxygen doc/Doxyfile</command>.
214 </para>
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;
227install -v -m755 tools/qt-faststart /usr/bin &amp;&amp;
228install -v -m644 doc/*.txt \
229 /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
230
231 <para>
232 If PDF and Postscript documentations were 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 \
238 /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
239install -v -m644 doc/*.ps \
240 /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
241
242 <para>
243 If you used <command>doxygen</command> to create the API documentation,
244 install it (another 300 MB of space) by issuing the following commands
245 as the <systemitem class="username">root</systemitem> user:
246 </para>
247
248<screen role="root"><userinput>install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
249cp -vr doc/doxy/html/* /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
250find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type f -exec chmod -c 0644 "{}" ";" &amp;&amp;
251find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type d -exec chmod -c 0755 "{}" ";"</userinput></screen>
252
253 <para>
254 To properly test the installation you must have <xref linkend="rsync"/>
255 installed and follow the instructions for the <ulink
256 url="http://www.ffmpeg.org/fate.html"> FFmpeg Automated Testing
257 Environment</ulink> (FATE). First, about 882 MB of sample files used to
258 run FATE are downloaded with the command:
259 </para>
260
261<screen><userinput>make fate-rsync SAMPLES=fate-suite/</userinput></screen>
262
263 <para>
264 The <filename class="directory">fate-suite</filename> directory is
265 created and the files are downloaded there. That command actually runs an
266 rsync command, to obtain the sample files. You may want to compress and
267 keep this directory for testing again, in another system, or when a new
268 version of ffmpeg is launched. Then, you unpack the sample files in the
269 source directory, and run, again, the <command>make fate-rsync
270 ...</command> command above, to sync with the repository. Now, the
271 download size and time are drastically reduced. Estimated values in
272 "Package Information" do not include the download SBU. Some samples may
273 have been removed, in the new version, so, in order to be sure local and
274 server fate samples are identical, when you use previous samples, run the
275 following command:
276 </para>
277
278<screen><userinput><command>rsync -vrltLW --delete --timeout=60 --contimeout=60 \
279 rsync://fate-suite.ffmpeg.org/fate-suite/ fate-suite/</command></userinput></screen>
280
281 <para>
282 Next, FATE is executed, with the commands (you obtain a number of tests
283 larger than 2000):
284 </para>
285
286<screen><userinput>make fate SAMPLES=fate-suite/ | tee ../fate.log &amp;&amp;
287grep ^TEST ../fate.log | wc -l</userinput></screen>
288
289 </sect2>
290
291 <sect2 role="commands">
292 <title>Command Explanations</title>
293
294 <para>
295 <command>sed -i ... configure</command>: This command adds the
296 <application>ALSA</application> library to the
297 <application>Flite</application> <envar>LDFLAGS</envar> variable and
298 enables the discovery of <application>Flite</application>.
299 </para>
300
301 <para>
302 <command>sed -i ... texi</command>: Fix some .texi files for
303 documentation builds.
304 </para>
305
306 <para>
307 <command>find ... ";"</command>: Fix permissions of documentation files
308 and directories.
309 </para>
310
311 <para>
312 <option>--enable-libfreetype</option>: Enables
313 <application>Freetype</application> support.
314 </para>
315
316 <para>
317 <parameter>--enable-gpl</parameter>: Enables the use of GPL code and
318 permits support for postprocessing, swscale and many other features.
319 </para>
320
321 <para>
322 <parameter>--enable-version3</parameter>: Enables the use of (L)GPL
323 version 3 code.
324 </para>
325
326 <para>
327 <parameter>--enable-nonfree</parameter>: Enables the use of nonfree code.
328 Note that the resulting libraries and binaries will be unredistributable.
329 </para>
330
331 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
332 href="../../xincludes/static-libraries.xml"/>
333
334 <para>
335 <parameter>--enable-shared</parameter>: Enables building shared
336 libraries, otherwise only static libraries are built and installed.
337 </para>
338
339 <para>
340 <parameter>--disable-debug</parameter>: Disables building debugging
341 symbols into the programs and libraries.
342 </para>
343
344 <para>
345 <parameter>--enable-libass</parameter>: Enables ASS/SSA subtitle format
346 rendering via <filename class="libraryfile">libass</filename>.
347 </para>
348
349 <para>
350 <parameter>--enable-libfdk-aac</parameter>: Enables currently the
351 highest-quality AAC audio encoding via <filename
352 class="libraryfile">libfdk-aac</filename>.
353 </para>
354
355 <para>
356 <parameter>--enable-libmp3lame</parameter>: Enables MP3 audio encoding
357 via <filename class="libraryfile">libmp3lame</filename>.
358 </para>
359
360 <para>
361 <parameter>--enable-libvorbis --enable-libtheora</parameter>: Enables
362 Theora video encoding via <filename
363 class="libraryfile">libvorbis</filename> and <filename
364 class="libraryfile">libtheora</filename>.
365 </para>
366
367 <para>
368 <parameter>--enable-libvorbis --enable-libvpx</parameter>: Enables WebM
369 encoding via <filename class="libraryfile">libvorbis</filename> and
370 <filename class="libraryfile">libvpx</filename>.
371 </para>
372
373 <para>
374 <parameter>--enable-libx264</parameter>: Enables high-quality
375 H.264/MPEG-4 AVC encoding via <filename
376 class="libraryfile">libx264</filename>.
377 </para>
378
379 <para>
380 <parameter>--enable-x11grab</parameter>: Enables X11 grabbing.
381 </para>
382
383 <para>
384 <command>gcc tools/qt-faststart.c -o tools/qt-faststart</command>: This
385 builds the <command>qt-faststart</command> program which can modify
386 QuickTime formatted movies (<filename class="extension">.mov</filename>
387 or <filename class="extension">.mp4</filename>) so that the header
388 information is located at the beginning of the file instead of the end.
389 This allows the movie file to begin playing before the entire file has
390 been downloaded.
391 </para>
392
393 <note>
394 <para>
395 Support for most of the dependency packages requires using options
396 passed to the <command>configure</command> script. View the output
397 from <command>./configure --help</command> for complete information
398 about enabling dependency packages.
399 </para>
400 </note>
401
402 </sect2>
403
404 <sect2 role="configuration">
405 <title>Configuring FFmpeg</title>
406
407 <sect3 id="ffmpeg-config">
408 <title>Config Files</title>
409
410 <para>
411 <filename>/etc/ffserver.conf</filename> and
412 <filename>~/.ffmpeg/ffserver-config</filename>
413 </para>
414
415 <indexterm zone="ffmpeg ffmpeg-config">
416 <primary
417 sortas="e-AA.ffmpeg-ffserver-config">~/.ffmpeg/ffserver-config</primary>
418 </indexterm>
419
420 <indexterm zone="ffmpeg ffmpeg-config">
421 <primary sortas="e-etc-ffserver.conf">/etc/ffserver.conf</primary>
422 </indexterm>
423
424 <para>
425 You'll find a sample <command>ffserver</command> configuration file at
426 <filename>doc/ffserver.conf</filename> in the source tree.
427 </para>
428
429 </sect3>
430
431 </sect2>
432
433 <sect2 role="content">
434 <title>Contents</title>
435
436 <segmentedlist>
437 <segtitle>Installed Programs</segtitle>
438 <segtitle>Installed Libraries</segtitle>
439 <segtitle>Installed Directories</segtitle>
440
441 <seglistitem>
442 <seg>
443 ffmpeg, ffplay, ffprobe, ffserver, and
444 qt-faststart
445 </seg>
446 <seg>
447 libavcodec.so, libavdevice.so, libavfilter.so,
448 libavformat.so, libavutil.so, libpostproc.so,
449 libswresample, and libswscale.so
450 </seg>
451 <seg>
452 /usr/include/libavcodec,
453 /usr/include/libavdevice,
454 /usr/include/libavfilter,
455 /usr/include/libavformat,
456 /usr/include/libavutil,
457 /usr/include/libpostproc,
458 /usr/include/libswresample
459 /usr/include/libswscale,
460 /usr/share/ffmpeg, and
461 /usr/share/doc/ffmpeg-&ffmpeg-version;
462 </seg>
463 </seglistitem>
464 </segmentedlist>
465
466 <variablelist>
467 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
468 <?dbfo list-presentation="list"?>
469 <?dbhtml list-presentation="table"?>
470
471 <varlistentry id="ffmpeg-prog">
472 <term><command>ffmpeg</command></term>
473 <listitem>
474 <para>
475 is a command-line tool to convert video files, network streams and
476 input from a TV card to several video formats.
477 </para>
478 <indexterm zone="ffmpeg ffmpeg-prog">
479 <primary sortas="b-ffmpeg">ffmpeg</primary>
480 </indexterm>
481 </listitem>
482 </varlistentry>
483
484 <varlistentry id="ffplay">
485 <term><command>ffplay</command></term>
486 <listitem>
487 <para>
488 is a very simple and portable media player using the
489 <filename>ffmpeg</filename> libraries and the SDL library.
490 </para>
491 <indexterm zone="ffmpeg ffplay">
492 <primary sortas="b-ffplay">ffplay</primary>
493 </indexterm>
494 </listitem>
495 </varlistentry>
496
497 <varlistentry id="ffprobe">
498 <term><command>ffprobe</command></term>
499 <listitem>
500 <para>
501 gathers information from multimedia streams and prints it in a human
502 and machine-readable fashion.
503 </para>
504 <indexterm zone="ffmpeg ffprobe">
505 <primary sortas="b-ffprobe">ffprobe</primary>
506 </indexterm>
507 </listitem>
508 </varlistentry>
509
510 <varlistentry id="ffserver">
511 <term><command>ffserver</command></term>
512 <listitem>
513 <para>
514 is a streaming server for everything that <command>ffmpeg</command>
515 could use as input (files, streams, TV card input, webcam, etc).
516 </para>
517 <indexterm zone="ffmpeg ffserver">
518 <primary sortas="b-ffserver">ffserver</primary>
519 </indexterm>
520 </listitem>
521 </varlistentry>
522
523 <varlistentry id="qt-faststart">
524 <term><command>qt-faststart</command></term>
525 <listitem>
526 <para>
527 moves the index file to the front of quicktime (mov/mp4) videos.
528 </para>
529 <indexterm zone="ffmpeg qt-faststart">
530 <primary sortas="b-qt-faststart">qt-faststart</primary>
531 </indexterm>
532 </listitem>
533 </varlistentry>
534
535 <varlistentry id="libavcodec">
536 <term><filename class="libraryfile">libavcodec.so</filename></term>
537 <listitem>
538 <para>
539 is a library containing the <application>FFmpeg</application> codecs
540 (both encoding and decoding).
541 </para>
542 <indexterm zone="ffmpeg libavcodec">
543 <primary sortas="c-libavcodec">libavcodec.so</primary>
544 </indexterm>
545 </listitem>
546 </varlistentry>
547
548 <varlistentry id="libavdevice">
549 <term><filename class="libraryfile">libavdevice.so</filename></term>
550 <listitem>
551 <para>
552 is the <application>FFmpeg</application> device handling library.
553 </para>
554 <indexterm zone="ffmpeg libavdevice">
555 <primary sortas="c-libavdevice">libavdevice.so</primary>
556 </indexterm>
557 </listitem>
558 </varlistentry>
559
560 <varlistentry id="libavfilter">
561 <term><filename class="libraryfile">libavfilter.so</filename></term>
562 <listitem>
563 <para>
564 is a library of filters that can alter video or audio between the
565 decoder and the encoder (or output).
566 </para>
567 <indexterm zone="ffmpeg libavfilter">
568 <primary sortas="c-libavfilter">libavfilter.so</primary>
569 </indexterm>
570 </listitem>
571 </varlistentry>
572
573 <varlistentry id="libavformat">
574 <term><filename class="libraryfile">libavformat.so</filename></term>
575 <listitem>
576 <para>
577 is a library containing the file formats handling (mux and demux
578 code for several formats) used by <command>ffplay</command> as well
579 as allowing the generation of audio or video streams.
580 </para>
581 <indexterm zone="ffmpeg libavformat">
582 <primary sortas="c-libavformat">libavformat.so</primary>
583 </indexterm>
584 </listitem>
585 </varlistentry>
586
587 <varlistentry id="libavutil">
588 <term><filename class="libraryfile">libavutil.so</filename></term>
589 <listitem>
590 <para>
591 is the <application>FFmpeg</application> utility library.
592 </para>
593 <indexterm zone="ffmpeg libavutil">
594 <primary sortas="c-libavutil">libavutil.so</primary>
595 </indexterm>
596 </listitem>
597 </varlistentry>
598
599 <varlistentry id="libpostproc">
600 <term><filename class="libraryfile">libpostproc.so</filename></term>
601 <listitem>
602 <para>
603 is the <application>FFmpeg</application> post processing library.
604 </para>
605 <indexterm zone="ffmpeg libpostproc">
606 <primary sortas="c-libpostproc">libpostproc.so</primary>
607 </indexterm>
608 </listitem>
609 </varlistentry>
610
611 <varlistentry id="libswresample">
612 <term><filename class="libraryfile">libswresample.so</filename></term>
613 <listitem>
614 <para>
615 is the <application>FFmpeg</application> audio rescaling library,
616 it contains functions for converting audio sample formats.
617 </para>
618 <indexterm zone="ffmpeg libswresample">
619 <primary sortas="c-libswresample">libswresample.so</primary>
620 </indexterm>
621 </listitem>
622 </varlistentry>
623
624 <varlistentry id="libswscale">
625 <term><filename class="libraryfile">libswscale.so</filename></term>
626 <listitem>
627 <para>
628 is the <application>FFmpeg</application> image rescaling library.
629 </para>
630 <indexterm zone="ffmpeg libswscale">
631 <primary sortas="c-libswscale">libswscale.so</primary>
632 </indexterm>
633 </listitem>
634 </varlistentry>
635
636 </variablelist>
637
638 </sect2>
639
640</sect1>
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