source: multimedia/videoutils/ffmpeg.xml@ f90448e

10.0 10.1 11.0 11.1 11.2 11.3 12.0 12.1 12.2 7.10 7.8 7.9 8.0 8.1 8.2 8.3 8.4 9.0 9.1 basic bdubbs/svn elogind gimp3 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/for-12.3 xry111/intltool xry111/llvm18 xry111/soup3 xry111/spidermonkey128 xry111/test-20220226 xry111/xf86-video-removal
Last change on this file since f90448e was f90448e, checked in by Bruce Dubbs <bdubbs@…>, 10 years ago

Add libcdio-0.93

git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@15623 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.bz2">
8 <!ENTITY ffmpeg-download-ftp " ">
9 <!ENTITY ffmpeg-md5sum "af92a816b642d32134a764d2d7f55b75">
10 <!ENTITY ffmpeg-size "7.4 MB">
11 <!ENTITY ffmpeg-buildsize "133 MB (additional 856 MB for docs and 2302 MB to run the FATE suite)">
12 <!ENTITY ffmpeg-time "1.2 SBU (using parallelism=4); additional 1 SBU for docs and 5.4 SBU to run the FATE suite, 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 &lfs77_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="libcdio"/> (to identify and play CDs),
106 <xref linkend="faac"/>,
107 <xref linkend="freetype2"/>,
108 <xref linkend="libwebp"/>,
109 <xref linkend="openjpeg"/>,
110 <xref linkend="pulseaudio"/>,
111 <xref linkend="speex"/>,
112 <xref linkend="xvid"/>,
113 <xref linkend="openssl"/> or
114 <xref linkend="gnutls"/>,
115 <xref linkend="fontconfig"/>,
116 <xref linkend="opus"/>,
117 <xref linkend="v4l-utils"/>,
118 <ulink url="https://files.dyne.org/frei0r/snapshots/">frei0r</ulink>,
119 <ulink url="http://xhevc.com/en/hevc/decoder/download.jsp">HEVC/H.265</ulink>,
120 <ulink url="http://www.ladspa.org/">LADSPA</ulink>,
121 <ulink url="http://www.libssh.org/">libssh</ulink>,
122 <ulink url="http://zapping.sourceforge.net/ZVBI/">ZVBI</ulink>,
123 <ulink url="http://tipok.org.ua/node/17">libaacplus</ulink>,
124 <ulink url="http://www.videolan.org/developers/libbluray.html">libbluray</ulink>,
125 <ulink url="http://caca.zoy.org/">libcaca</ulink>,
126 <ulink url="http://www.celt-codec.org/">libcelt</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 <xref linkend="texlive"/> (or <xref linkend="tl-installer"/>) for PDF and PS documentation,
139 <ulink url="http://www.twolame.org/">TwoLAME</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 2300):
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 <option>--enable-openssl</option> or <option>--enable-gnutls</option>:
385 Enables HTTPS protocol for network streams.
386 </para>
387
388 <para>
389 <command>gcc tools/qt-faststart.c -o tools/qt-faststart</command>: This
390 builds the <command>qt-faststart</command> program which can modify
391 QuickTime formatted movies (<filename class="extension">.mov</filename>
392 or <filename class="extension">.mp4</filename>) so that the header
393 information is located at the beginning of the file instead of the end.
394 This allows the movie file to begin playing before the entire file has
395 been downloaded.
396 </para>
397
398 <note>
399 <para>
400 Support for most of the dependency packages requires using options
401 passed to the <command>configure</command> script. View the output
402 from <command>./configure --help</command> for complete information
403 about enabling dependency packages.
404 </para>
405 </note>
406
407 </sect2>
408
409 <sect2 role="configuration">
410 <title>Configuring FFmpeg</title>
411
412 <sect3 id="ffmpeg-config">
413 <title>Config Files</title>
414
415 <para>
416 <filename>/etc/ffserver.conf</filename> and
417 <filename>~/.ffmpeg/ffserver-config</filename>
418 </para>
419
420 <indexterm zone="ffmpeg ffmpeg-config">
421 <primary
422 sortas="e-AA.ffmpeg-ffserver-config">~/.ffmpeg/ffserver-config</primary>
423 </indexterm>
424
425 <indexterm zone="ffmpeg ffmpeg-config">
426 <primary sortas="e-etc-ffserver.conf">/etc/ffserver.conf</primary>
427 </indexterm>
428
429 <para>
430 You'll find a sample <command>ffserver</command> configuration file at
431 <filename>doc/ffserver.conf</filename> in the source tree.
432 </para>
433
434 </sect3>
435
436 </sect2>
437
438 <sect2 role="content">
439 <title>Contents</title>
440
441 <segmentedlist>
442 <segtitle>Installed Programs</segtitle>
443 <segtitle>Installed Libraries</segtitle>
444 <segtitle>Installed Directories</segtitle>
445
446 <seglistitem>
447 <seg>
448 ffmpeg, ffplay, ffprobe, ffserver, and
449 qt-faststart
450 </seg>
451 <seg>
452 libavcodec.so, libavdevice.so, libavfilter.so,
453 libavformat.so, libavutil.so, libpostproc.so,
454 libswresample, and libswscale.so
455 </seg>
456 <seg>
457 /usr/include/{libavcodec,libavdevice,libavfilter,libavformat},
458 /usr/include/{libavutil,libpostproc,libswresample,libswscale},
459 /usr/share/doc/ffmpeg-&ffmpeg-version;, and
460 /usr/share/ffmpeg
461 </seg>
462 </seglistitem>
463 </segmentedlist>
464
465 <variablelist>
466 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
467 <?dbfo list-presentation="list"?>
468 <?dbhtml list-presentation="table"?>
469
470 <varlistentry id="ffmpeg-prog">
471 <term><command>ffmpeg</command></term>
472 <listitem>
473 <para>
474 is a command-line tool to convert video files, network streams and
475 input from a TV card to several video formats.
476 </para>
477 <indexterm zone="ffmpeg ffmpeg-prog">
478 <primary sortas="b-ffmpeg">ffmpeg</primary>
479 </indexterm>
480 </listitem>
481 </varlistentry>
482
483 <varlistentry id="ffplay">
484 <term><command>ffplay</command></term>
485 <listitem>
486 <para>
487 is a very simple and portable media player using the
488 <filename>ffmpeg</filename> libraries and the SDL library.
489 </para>
490 <indexterm zone="ffmpeg ffplay">
491 <primary sortas="b-ffplay">ffplay</primary>
492 </indexterm>
493 </listitem>
494 </varlistentry>
495
496 <varlistentry id="ffprobe">
497 <term><command>ffprobe</command></term>
498 <listitem>
499 <para>
500 gathers information from multimedia streams and prints it in a human
501 and machine-readable fashion.
502 </para>
503 <indexterm zone="ffmpeg ffprobe">
504 <primary sortas="b-ffprobe">ffprobe</primary>
505 </indexterm>
506 </listitem>
507 </varlistentry>
508
509 <varlistentry id="ffserver">
510 <term><command>ffserver</command></term>
511 <listitem>
512 <para>
513 is a streaming server for everything that <command>ffmpeg</command>
514 could use as input (files, streams, TV card input, webcam, etc).
515 </para>
516 <indexterm zone="ffmpeg ffserver">
517 <primary sortas="b-ffserver">ffserver</primary>
518 </indexterm>
519 </listitem>
520 </varlistentry>
521
522 <varlistentry id="qt-faststart">
523 <term><command>qt-faststart</command></term>
524 <listitem>
525 <para>
526 moves the index file to the front of quicktime (mov/mp4) videos.
527 </para>
528 <indexterm zone="ffmpeg qt-faststart">
529 <primary sortas="b-qt-faststart">qt-faststart</primary>
530 </indexterm>
531 </listitem>
532 </varlistentry>
533
534 <varlistentry id="libavcodec">
535 <term><filename class="libraryfile">libavcodec.so</filename></term>
536 <listitem>
537 <para>
538 is a library containing the <application>FFmpeg</application> codecs
539 (both encoding and decoding).
540 </para>
541 <indexterm zone="ffmpeg libavcodec">
542 <primary sortas="c-libavcodec">libavcodec.so</primary>
543 </indexterm>
544 </listitem>
545 </varlistentry>
546
547 <varlistentry id="libavdevice">
548 <term><filename class="libraryfile">libavdevice.so</filename></term>
549 <listitem>
550 <para>
551 is the <application>FFmpeg</application> device handling library.
552 </para>
553 <indexterm zone="ffmpeg libavdevice">
554 <primary sortas="c-libavdevice">libavdevice.so</primary>
555 </indexterm>
556 </listitem>
557 </varlistentry>
558
559 <varlistentry id="libavfilter">
560 <term><filename class="libraryfile">libavfilter.so</filename></term>
561 <listitem>
562 <para>
563 is a library of filters that can alter video or audio between the
564 decoder and the encoder (or output).
565 </para>
566 <indexterm zone="ffmpeg libavfilter">
567 <primary sortas="c-libavfilter">libavfilter.so</primary>
568 </indexterm>
569 </listitem>
570 </varlistentry>
571
572 <varlistentry id="libavformat">
573 <term><filename class="libraryfile">libavformat.so</filename></term>
574 <listitem>
575 <para>
576 is a library containing the file formats handling (mux and demux
577 code for several formats) used by <command>ffplay</command> as well
578 as allowing the generation of audio or video streams.
579 </para>
580 <indexterm zone="ffmpeg libavformat">
581 <primary sortas="c-libavformat">libavformat.so</primary>
582 </indexterm>
583 </listitem>
584 </varlistentry>
585
586 <varlistentry id="libavutil">
587 <term><filename class="libraryfile">libavutil.so</filename></term>
588 <listitem>
589 <para>
590 is the <application>FFmpeg</application> utility library.
591 </para>
592 <indexterm zone="ffmpeg libavutil">
593 <primary sortas="c-libavutil">libavutil.so</primary>
594 </indexterm>
595 </listitem>
596 </varlistentry>
597
598 <varlistentry id="libpostproc">
599 <term><filename class="libraryfile">libpostproc.so</filename></term>
600 <listitem>
601 <para>
602 is the <application>FFmpeg</application> post processing library.
603 </para>
604 <indexterm zone="ffmpeg libpostproc">
605 <primary sortas="c-libpostproc">libpostproc.so</primary>
606 </indexterm>
607 </listitem>
608 </varlistentry>
609
610 <varlistentry id="libswresample">
611 <term><filename class="libraryfile">libswresample.so</filename></term>
612 <listitem>
613 <para>
614 is the <application>FFmpeg</application> audio rescaling library,
615 it contains functions for converting audio sample formats.
616 </para>
617 <indexterm zone="ffmpeg libswresample">
618 <primary sortas="c-libswresample">libswresample.so</primary>
619 </indexterm>
620 </listitem>
621 </varlistentry>
622
623 <varlistentry id="libswscale">
624 <term><filename class="libraryfile">libswscale.so</filename></term>
625 <listitem>
626 <para>
627 is the <application>FFmpeg</application> image rescaling library.
628 </para>
629 <indexterm zone="ffmpeg libswscale">
630 <primary sortas="c-libswscale">libswscale.so</primary>
631 </indexterm>
632 </listitem>
633 </varlistentry>
634
635 </variablelist>
636
637 </sect2>
638
639</sect1>
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