source: multimedia/videoutils/ffmpeg.xml@ 59417918

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Last change on this file since 59417918 was 59417918, checked in by Bruce Dubbs <bdubbs@…>, 3 years ago

Tag most of multimedia and dependencies

git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@21190 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 "720fc84617a2c38aeae79aff3689a567">
10 <!ENTITY ffmpeg-size "8.5 MB">
11 <!ENTITY ffmpeg-buildsize "159 MB (add 3.1 GB for the FATE suite/tests, add 17 MB for docs)">
12 <!ENTITY ffmpeg-time "1.4 SBU (using parallelism=4; add 3.8 SBU (with THREADS=4) 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 &lfs84_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="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-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><userinput>pushd doc &amp;&amp;
197for DOCNAME in `basename -s .html *.html`
198do
199 texi2pdf -b $DOCNAME.texi &amp;&amp;
200 texi2dvi -b $DOCNAME.texi &amp;&amp;
201
202 dvips -o $DOCNAME.ps \
203 $DOCNAME.dvi
204done &amp;&amp;
205popd &amp;&amp;
206unset DOCNAME</userinput></screen>
207
208 <para>
209 If you have <xref linkend="doxygen"/> installed
210 and you wish to build (if --disable-doc was
211 used) or rebuild the html documentation, issue the command
212 <command>doxygen doc/Doxyfile</command>.
213 </para>
214
215 <para>
216 The fate-suite tests include comparisons with installed files, and should
217 not be run before the package is installed. Therefore, if you desire to
218 run them, instructions are given further below.
219 </para>
220
221 <para>
222 Now, as the <systemitem class="username">root</systemitem> user:
223 </para>
224
225<screen role="root"><userinput>make install &amp;&amp;
226
227install -v -m755 tools/qt-faststart /usr/bin &amp;&amp;
228install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
229install -v -m644 doc/*.txt /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
230
231 <para>
232 If the PDF and Postscript documentation was built, issue the following
233 commands, as the <systemitem class="username">root</systemitem> user, to
234 install them:
235 </para>
236
237<screen role="root"><userinput>install -v -m644 doc/*.pdf /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
238install -v -m644 doc/*.ps /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
239
240 <para>
241 If you used <command>doxygen</command> to manually create the API
242 documentation, install it by issuing the following commands
243 as the <systemitem class="username">root</systemitem> user:
244 </para>
245
246<screen role="root"><userinput>install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
247cp -vr doc/doxy/html/* /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
248find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type f -exec chmod -c 0644 \{} \; &amp;&amp;
249find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type d -exec chmod -c 0755 \{} \;</userinput></screen>
250
251 <para>
252 To properly test the installation you must have <xref linkend="rsync"/>
253 installed and follow the instructions for the <ulink
254 url="http://www.ffmpeg.org/fate.html"> FFmpeg Automated Testing
255 Environment</ulink> (FATE). First, about 1 GB of sample files used to
256 run FATE are downloaded with the command:
257 </para>
258
259<screen><userinput>make fate-rsync SAMPLES=fate-suite/</userinput></screen>
260
261 <para>
262 The <filename class="directory">fate-suite</filename> directory is
263 created and the files are downloaded there. That command actually runs an
264 rsync command, to obtain the sample files. You may want to compress and
265 keep this directory for testing again, in another system, or when a new
266 version of ffmpeg is launched. Then, you unpack the sample files in the
267 source directory, and run, again, the <command>make fate-rsync
268 ...</command> command above, to sync with the repository. Now, the
269 download size and time are drastically reduced. Estimated values in
270 "Package Information" do not include the download SBU. Some samples may
271 have been removed, in the new version, so, in order to be sure local and
272 server fate samples are identical, when you use previously saved samples,
273 run the following command:
274 </para>
275
276<screen><userinput><command>rsync -vrltLW --delete --timeout=60 --contimeout=60 \
277 rsync://fate-suite.ffmpeg.org/fate-suite/ fate-suite/</command></userinput></screen>
278
279 <para>
280 Next, FATE is executed, with the commands (you obtain a number of tests
281 larger than 3000):
282 </para>
283
284<screen><userinput>make fate THREADS=<replaceable>N</replaceable> SAMPLES=fate-suite/ | tee ../fate.log &amp;&amp;
285grep ^TEST ../fate.log | wc -l</userinput></screen>
286
287 <para>
288 where <replaceable>N</replaceable> is an integer,
289 <replaceable>N</replaceable> &le; number of cores in the system.
290 </para>
291
292 </sect2>
293
294 <sect2 role="commands">
295 <title>Command Explanations</title>
296
297 <para>
298 <command>sed -i ... configure</command>: This command adds the
299 <application>ALSA</application> library to the
300 <application>Flite</application> <envar>LDFLAGS</envar> variable and
301 enables the discovery of <application>Flite</application>.
302 </para>
303
304 <para>
305 <command>find ... ;</command>: Fix permissions of documentation files
306 and directories.
307 </para>
308
309 <para>
310 <parameter>--enable-libfreetype</parameter>: Enables
311 <application>Freetype</application> support.
312 </para>
313
314 <para>
315 <parameter>--enable-gpl</parameter>: Enables the use of GPL code and
316 permits support for postprocessing, swscale and many other features.
317 </para>
318
319 <para>
320 <parameter>--enable-version3</parameter>: Enables the use of (L)GPL
321 version 3 code.
322 </para>
323
324 <para>
325 <parameter>--enable-nonfree</parameter>: Enables the use of nonfree code.
326 Note that the resulting libraries and binaries will be unredistributable.
327 </para>
328
329 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
330 href="../../xincludes/static-libraries.xml"/>
331
332 <para>
333 <parameter>--enable-shared</parameter>: Enables building shared
334 libraries, otherwise only static libraries are built and installed.
335 </para>
336
337 <para>
338 <parameter>--disable-debug</parameter>: Disables building debugging
339 symbols into the programs and libraries.
340 </para>
341
342 <para>
343 <parameter>--enable-avresample</parameter>: Enables
344 <xref linkend="transcode"/> to be compiled.
345 </para>
346
347 <para>
348 <parameter>--enable-libass</parameter>: Enables ASS/SSA subtitle format
349 rendering via <filename class="libraryfile">libass</filename>.
350 </para>
351
352 <para>
353 <parameter>--enable-libfdk-aac</parameter>: Enables currently the
354 highest-quality AAC audio encoding via <filename
355 class="libraryfile">libfdk-aac</filename>.
356 </para>
357
358 <para>
359 <parameter>--enable-libmp3lame</parameter>: Enables MP3 audio encoding
360 via <filename class="libraryfile">libmp3lame</filename>.
361 </para>
362
363 <para>
364 <parameter>--enable-libvorbis --enable-libtheora</parameter>: Enables
365 Theora video encoding via <filename
366 class="libraryfile">libvorbis</filename> and <filename
367 class="libraryfile">libtheora</filename>.
368 </para>
369
370 <para>
371 <parameter>--enable-libvorbis --enable-libvpx</parameter>: Enables WebM
372 encoding via <filename class="libraryfile">libvorbis</filename> and
373 <filename class="libraryfile">libvpx</filename>.
374 </para>
375
376 <para>
377 <parameter>--enable-libx264</parameter>: Enables high-quality
378 H.264/MPEG-4 AVC encoding via <filename
379 class="libraryfile">libx264</filename>.
380 </para>
381
382 <para>
383 <parameter>--enable-libx265</parameter>: Enables high-quality
384 H.265/HEVC encoding via <filename
385 class="libraryfile">libx265</filename>.
386 </para>
387
388 <para>
389 <option>--enable-openssl</option> or <option>--enable-gnutls</option>:
390 Enables HTTPS protocol for network streams.
391 </para>
392
393 <para>
394 <option>--disable-doc</option>: Disables building html documentation.
395 This is only needed if <xref linkend="doxygen"/> is installed and you
396 do not want to build the html documentation.
397 </para>
398
399 <para>
400 <command>gcc tools/qt-faststart.c -o tools/qt-faststart</command>: This
401 builds the <command>qt-faststart</command> program which can modify
402 QuickTime formatted movies (<filename class="extension">.mov</filename>
403 or <filename class="extension">.mp4</filename>) so that the header
404 information is located at the beginning of the file instead of the end.
405 This allows the movie file to begin playing before the entire file has
406 been downloaded.
407 </para>
408
409 <note>
410 <para>
411 Support for most of the dependency packages requires using options
412 passed to the <command>configure</command> script. View the output
413 from <command>./configure --help</command> for complete information
414 about enabling dependency packages.
415 </para>
416 </note>
417
418 </sect2>
419
420 <sect2 role="configuration">
421 <title>Configuring FFmpeg</title>
422
423 <sect3 id="ffmpeg-config">
424 <title>Config Files</title>
425
426 <para>
427 <filename>/etc/ffserver.conf</filename> and
428 <filename>~/.ffmpeg/ffserver-config</filename>
429 </para>
430
431 <indexterm zone="ffmpeg ffmpeg-config">
432 <primary
433 sortas="e-AA.ffmpeg-ffserver-config">~/.ffmpeg/ffserver-config</primary>
434 </indexterm>
435
436 <indexterm zone="ffmpeg ffmpeg-config">
437 <primary sortas="e-etc-ffserver.conf">/etc/ffserver.conf</primary>
438 </indexterm>
439
440 <para>
441 You'll find a sample <command>ffserver</command> configuration file at
442 <filename>doc/ffserver.conf</filename> in the source tree.
443 </para>
444
445 </sect3>
446
447 </sect2>
448
449 <sect2 role="content">
450 <title>Contents</title>
451
452 <segmentedlist>
453 <segtitle>Installed Programs</segtitle>
454 <segtitle>Installed Libraries</segtitle>
455 <segtitle>Installed Directories</segtitle>
456
457 <seglistitem>
458 <seg>
459 ffmpeg, ffplay, ffprobe, ffserver, and qt-faststart
460 </seg>
461 <seg>
462 libavcodec.so, libavdevice.so, libavfilter.so,
463 libavformat.so, libavutil.so, libpostproc.so,
464 libswresample.so, and libswscale.so
465 </seg>
466 <seg>
467 /usr/include/libav{codec,device,filter,format,util},
468 /usr/include/libpostproc,
469 /usr/include/libsw{resample,scale},
470 /usr/share/doc/ffmpeg-&ffmpeg-version;, and
471 /usr/share/ffmpeg
472 </seg>
473 </seglistitem>
474 </segmentedlist>
475
476 <variablelist>
477 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
478 <?dbfo list-presentation="list"?>
479 <?dbhtml list-presentation="table"?>
480
481 <varlistentry id="ffmpeg-prog">
482 <term><command>ffmpeg</command></term>
483 <listitem>
484 <para>
485 is a command-line tool to convert video files, network streams and
486 input from a TV card to several video formats.
487 </para>
488 <indexterm zone="ffmpeg ffmpeg-prog">
489 <primary sortas="b-ffmpeg">ffmpeg</primary>
490 </indexterm>
491 </listitem>
492 </varlistentry>
493
494 <varlistentry id="ffplay">
495 <term><command>ffplay</command></term>
496 <listitem>
497 <para>
498 is a very simple and portable media player using the
499 <filename>ffmpeg</filename> libraries and the SDL library.
500 </para>
501 <indexterm zone="ffmpeg ffplay">
502 <primary sortas="b-ffplay">ffplay</primary>
503 </indexterm>
504 </listitem>
505 </varlistentry>
506
507 <varlistentry id="ffprobe">
508 <term><command>ffprobe</command></term>
509 <listitem>
510 <para>
511 gathers information from multimedia streams and prints it in a human
512 and machine-readable fashion.
513 </para>
514 <indexterm zone="ffmpeg ffprobe">
515 <primary sortas="b-ffprobe">ffprobe</primary>
516 </indexterm>
517 </listitem>
518 </varlistentry>
519
520 <varlistentry id="ffserver">
521 <term><command>ffserver</command></term>
522 <listitem>
523 <para>
524 is a streaming server for everything that <command>ffmpeg</command>
525 could use as input (files, streams, TV card input, webcam, etc).
526 </para>
527 <indexterm zone="ffmpeg ffserver">
528 <primary sortas="b-ffserver">ffserver</primary>
529 </indexterm>
530 </listitem>
531 </varlistentry>
532
533 <varlistentry id="qt-faststart">
534 <term><command>qt-faststart</command></term>
535 <listitem>
536 <para>
537 moves the index file to the front of quicktime (mov/mp4) videos.
538 </para>
539 <indexterm zone="ffmpeg qt-faststart">
540 <primary sortas="b-qt-faststart">qt-faststart</primary>
541 </indexterm>
542 </listitem>
543 </varlistentry>
544
545 <varlistentry id="libavcodec">
546 <term><filename class="libraryfile">libavcodec.so</filename></term>
547 <listitem>
548 <para>
549 is a library containing the <application>FFmpeg</application> codecs
550 (both encoding and decoding).
551 </para>
552 <indexterm zone="ffmpeg libavcodec">
553 <primary sortas="c-libavcodec">libavcodec.so</primary>
554 </indexterm>
555 </listitem>
556 </varlistentry>
557
558 <varlistentry id="libavdevice">
559 <term><filename class="libraryfile">libavdevice.so</filename></term>
560 <listitem>
561 <para>
562 is the <application>FFmpeg</application> device handling library.
563 </para>
564 <indexterm zone="ffmpeg libavdevice">
565 <primary sortas="c-libavdevice">libavdevice.so</primary>
566 </indexterm>
567 </listitem>
568 </varlistentry>
569
570 <varlistentry id="libavfilter">
571 <term><filename class="libraryfile">libavfilter.so</filename></term>
572 <listitem>
573 <para>
574 is a library of filters that can alter video or audio between the
575 decoder and the encoder (or output).
576 </para>
577 <indexterm zone="ffmpeg libavfilter">
578 <primary sortas="c-libavfilter">libavfilter.so</primary>
579 </indexterm>
580 </listitem>
581 </varlistentry>
582
583 <varlistentry id="libavformat">
584 <term><filename class="libraryfile">libavformat.so</filename></term>
585 <listitem>
586 <para>
587 is a library containing the file formats handling (mux and demux
588 code for several formats) used by <command>ffplay</command> as well
589 as allowing the generation of audio or video streams.
590 </para>
591 <indexterm zone="ffmpeg libavformat">
592 <primary sortas="c-libavformat">libavformat.so</primary>
593 </indexterm>
594 </listitem>
595 </varlistentry>
596
597 <varlistentry id="libavutil">
598 <term><filename class="libraryfile">libavutil.so</filename></term>
599 <listitem>
600 <para>
601 is the <application>FFmpeg</application> utility library.
602 </para>
603 <indexterm zone="ffmpeg libavutil">
604 <primary sortas="c-libavutil">libavutil.so</primary>
605 </indexterm>
606 </listitem>
607 </varlistentry>
608
609 <varlistentry id="libpostproc">
610 <term><filename class="libraryfile">libpostproc.so</filename></term>
611 <listitem>
612 <para>
613 is the <application>FFmpeg</application> post processing library.
614 </para>
615 <indexterm zone="ffmpeg libpostproc">
616 <primary sortas="c-libpostproc">libpostproc.so</primary>
617 </indexterm>
618 </listitem>
619 </varlistentry>
620
621 <varlistentry id="libswresample">
622 <term><filename class="libraryfile">libswresample.so</filename></term>
623 <listitem>
624 <para>
625 is the <application>FFmpeg</application> audio rescaling library,
626 it contains functions for converting audio sample formats.
627 </para>
628 <indexterm zone="ffmpeg libswresample">
629 <primary sortas="c-libswresample">libswresample.so</primary>
630 </indexterm>
631 </listitem>
632 </varlistentry>
633
634 <varlistentry id="libswscale">
635 <term><filename class="libraryfile">libswscale.so</filename></term>
636 <listitem>
637 <para>
638 is the <application>FFmpeg</application> image rescaling library.
639 </para>
640 <indexterm zone="ffmpeg libswscale">
641 <primary sortas="c-libswscale">libswscale.so</primary>
642 </indexterm>
643 </listitem>
644 </varlistentry>
645
646 </variablelist>
647
648 </sect2>
649
650</sect1>
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