source: multimedia/videoutils/ffmpeg.xml@ 7e1afc9

10.0 10.1 11.0 8.0 8.1 8.2 8.3 8.4 9.0 9.1 basic bdubbs/svn elogind ken/refactor-virt lazarus perl-modules qt5new trunk upgradedb xry111/git-date xry111/git-date-for-trunk xry111/git-date-test
Last change on this file since 7e1afc9 was 7e1afc9, checked in by Pierre Labastie <pieere@…>, 5 years ago

ffmpeg-3.2.2
firefox-50.1.0

git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@18064 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 "e34d1b92c5d844f2a3611c741a6dba18">
10 <!ENTITY ffmpeg-size "7.6 MB">
11 <!ENTITY ffmpeg-buildsize "171 MB (add 2.9 GB for the FATE suite/tests
12 and 1.0 GB for the documentation)">
13 <!ENTITY ffmpeg-time "4.1 SBU (add 0.6 SBU for docs and 4.0 SBU
14 to run the FATE suite after sample files are downloaded)">
15]>
16
17<sect1 id="ffmpeg" xreflabel="FFmpeg-&ffmpeg-version;">
18 <?dbhtml filename="ffmpeg.html"?>
19
20 <sect1info>
21 <othername>$LastChangedBy$</othername>
22 <date>$Date$</date>
23 </sect1info>
24
25 <title>FFmpeg-&ffmpeg-version;</title>
26
27 <indexterm zone="ffmpeg">
28 <primary sortas="a-FFmpeg">FFmpeg</primary>
29 </indexterm>
30
31 <sect2 role="package">
32 <title>Introduction to FFmpeg</title>
33
34 <para>
35 <application>FFmpeg</application> is a solution to record, convert and
36 stream audio and video. It is a very fast video and audio converter and it
37 can also acquire from a live audio/video source. Designed to be intuitive,
38 the command-line interface (<command>ffmpeg</command>) tries to figure out
39 all the parameters, when possible. <application>FFmpeg</application> can
40 also convert from any sample rate to any other, and resize video on the
41 fly with a high quality polyphase filter.
42 <application>FFmpeg</application> can use a Video4Linux compatible video
43 source and any Open Sound System audio source.
44 </para>
45
46 &lfs7a_checked;
47
48 <bridgehead renderas="sect3">Package Information</bridgehead>
49 <itemizedlist spacing="compact">
50 <listitem>
51 <para>
52 Download (HTTP): <ulink url="&ffmpeg-download-http;"/>
53 </para>
54 </listitem>
55 <listitem>
56 <para>
57 Download (FTP): <ulink url="&ffmpeg-download-ftp;"/>
58 </para>
59 </listitem>
60 <listitem>
61 <para>
62 Download MD5 sum: &ffmpeg-md5sum;
63 </para>
64 </listitem>
65 <listitem>
66 <para>
67 Download size: &ffmpeg-size;
68 </para>
69 </listitem>
70 <listitem>
71 <para>
72 Estimated disk space required: &ffmpeg-buildsize;
73 </para>
74 </listitem>
75 <listitem>
76 <para>
77 Estimated build time: &ffmpeg-time;
78 </para>
79 </listitem>
80 </itemizedlist>
81
82 <bridgehead renderas="sect3">FFmpeg Dependencies</bridgehead>
83
84 <bridgehead renderas="sect4">Recommended</bridgehead>
85 <para role="recommended">
86 <xref linkend="libass"/>,
87 <xref linkend="fdk-aac"/>,
88 <xref linkend="freetype2"/>,
89 <xref linkend="lame"/>,
90 <xref linkend="libtheora"/>,
91 <xref linkend="libvorbis"/>,
92 <xref linkend="libvpx"/>,
93 <xref linkend="opus"/>,
94 <xref linkend="x264"/>,
95 <xref linkend="x265"/>, and
96 <xref linkend="yasm"/>
97 </para>
98
99 <bridgehead renderas="sect4">Recommended for desktop use</bridgehead>
100 <para role="recommended">
101 <xref linkend="alsa-lib"/>,
102 <xref linkend="libva"/>,
103 <xref linkend="libvdpau"/> (with the corresponding driver package), and
104 <xref linkend="sdl2"/>,
105 </para>
106
107 <bridgehead renderas="sect4">Optional</bridgehead>
108 <para role="optional">
109 <xref linkend="fontconfig"/>,
110 <xref linkend="frei0r"/>,
111 <xref linkend="libcdio"/> (to identify and play CDs),
112 <xref linkend="libwebp"/>,
113 <xref linkend="opencv"/>,
114 <xref linkend="openjpeg"/>,
115 <xref linkend="openssl"/> or
116 <xref linkend="gnutls"/>,
117 <xref linkend="pulseaudio"/>,
118 <xref linkend="speex"/>,
119 <xref linkend="texlive"/>
120 (or <xref linkend="tl-installer"/>) for PDF and PS documentation,
121 <xref linkend="v4l-utils"/>,
122 <xref linkend="xvid"/>,
123 <xref linkend="x-window-system"/>,
124 <ulink url="http://www.speech.cs.cmu.edu/flite/">Flite</ulink>,
125 <ulink url="http://www.quut.com/gsm/">GSM</ulink>,
126 <ulink url="http://xhevc.com/en/hevc/decoder/download.jsp">HEVC/H.265</ulink>,
127 <!--<ulink url="http://www.ladspa.org/">LADSPA</ulink>,-->
128 <ulink url="http://tipok.org.ua/node/17">libaacplus</ulink>,
129 <ulink url="http://www.videolan.org/developers/libbluray.html">libbluray</ulink>,
130 <ulink url="http://caca.zoy.org/">libcaca</ulink>,
131 <ulink url="http://www.celt-codec.org/">libcelt</ulink>,
132 <ulink url="http://sourceforge.net/projects/libdc1394">libdc1394</ulink>,
133 <ulink url="https://www.videolan.org/developers/libdca.html">libdca</ulink>,
134 <ulink url="https://ieee1394.wiki.kernel.org/index.php/Libraries">libiec61883</ulink>,
135 <ulink url="https://github.com/dekkers/libilbc">libilbc</ulink>,
136 <ulink url="http://sourceforge.net/projects/modplug-xmms/">libmodplug</ulink>,
137 <ulink url="https://github.com/Distrotech/libnut">libnut</ulink> (Git checkout),
138 <ulink url="http://rtmpdump.mplayerhq.hu/">librtmp</ulink>,
139 <ulink url="http://www.libssh.org/">libssh</ulink>,
140 <!--<ulink url="http://xavs.sourceforge.net/">libxavs</ulink> (SVN checkout),-->
141 <ulink url="http://kcat.strangesoft.net/openal-releases/">OpenAL</ulink>,
142 <ulink url="http://sourceforge.net/projects/opencore-amr">OpenCore AMR</ulink>,
143 <!--<ulink url="http://diracvideo.org/">Schroedinger</ulink>,-->
144 <ulink url="http://sourceforge.net/projects/schrodinger/">Schroedinger</ulink>,
145 <ulink url="http://www.twolame.org/">TwoLAME</ulink>,
146 <ulink url="http://sourceforge.net/projects/opencore-amr/files/vo-aacenc/">vo-aaenc</ulink>,
147 <ulink url="http://sourceforge.net/projects/opencore-amr/files/vo-amrwbenc/">vo-amrwbenc</ulink>, and
148 <!--<ulink url="http://www.videolan.org/developers/x265.html">x265 (H.265/MPEG-H HEVC)</ulink>, and-->
149 <ulink url="http://zapping.sourceforge.net/ZVBI/">ZVBI</ulink>
150 </para>
151
152 <para condition="html" role="usernotes">
153 User Notes: <ulink url="&blfs-wiki;/ffmpeg"/>
154 </para>
155 </sect2>
156
157 <sect2 role="installation">
158 <title>Installation of FFmpeg</title>
159
160 <para>
161 Install <application>FFmpeg</application> by running the following
162 commands:
163 </para>
164
165<screen><userinput>sed -i 's/-lflite"/-lflite -lasound"/' configure &amp;&amp;
166
167./configure --prefix=/usr \
168 --enable-gpl \
169 --enable-version3 \
170 --enable-nonfree \
171 --disable-static \
172 --enable-shared \
173 --disable-debug \
174 --enable-libass \
175 --enable-libfdk-aac \
176 --enable-libfreetype \
177 --enable-libmp3lame \
178 --enable-libopus \
179 --enable-libtheora \
180 --enable-libvorbis \
181 --enable-libvpx \
182 --enable-libx264 \
183 --enable-libx265 \
184 --enable-x11grab \
185 --docdir=/usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
186
187make &amp;&amp;
188
189gcc tools/qt-faststart.c -o tools/qt-faststart</userinput></screen>
190
191 <para>
192 HTML documentation was built in the previous step. If you have
193 <xref linkend="texlive"/> installed and wish to build PDF and
194 Postscript versions of the documentation, issue the following commands:
195 </para>
196
197<!-- sed -i '$s/$/\n\n@bye/' doc/{git-howto,nut,fate}.texi &amp;&amp;
198sed -i '/machine:i386/ s/\\/@backslashchar{}/g' doc/platform.texi &amp;&amp; -->
199<screen><userinput>pushd 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
205 dvips -o $DOCNAME.ps \
206 $DOCNAME.dvi
207done &amp;&amp;
208popd &amp;&amp;
209unset DOCNAME</userinput></screen>
210
211 <para>
212 If you have <xref linkend="doxygen"/> installed and wish to create the API
213 documentation (takes about 500 MB space), issue the command
214 <command>doxygen doc/Doxyfile</command>.
215 </para>
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 -m644 doc/*.txt \
231 /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
232
233 <para>
234 If PDF and Postscript documentations were 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"><userinput>install -v -m644 doc/*.pdf \
240 /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
241install -v -m644 doc/*.ps \
242 /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
243
244 <para>
245 If you used <command>doxygen</command> to create the API documentation,
246 install it (another 500 MB of space) by issuing the following commands
247 as the <systemitem class="username">root</systemitem> user:
248 </para>
249
250<screen role="root"><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><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><userinput><command>rsync -vrltLW --delete --timeout=60 --contimeout=60 \
281 rsync://fate-suite.ffmpeg.org/fate-suite/ fate-suite/</command></userinput></screen>
282
283 <para>
284 Next, FATE is executed, with the commands (you obtain a number of tests
285 larger than 3000):
286 </para>
287
288<screen><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-libass</parameter>: Enables ASS/SSA subtitle format
348 rendering via <filename class="libraryfile">libass</filename>.
349 </para>
350
351 <para>
352 <parameter>--enable-libfdk-aac</parameter>: Enables currently the
353 highest-quality AAC audio encoding via <filename
354 class="libraryfile">libfdk-aac</filename>.
355 </para>
356
357 <para>
358 <parameter>--enable-libmp3lame</parameter>: Enables MP3 audio encoding
359 via <filename class="libraryfile">libmp3lame</filename>.
360 </para>
361
362 <para>
363 <parameter>--enable-libvorbis --enable-libtheora</parameter>: Enables
364 Theora video encoding via <filename
365 class="libraryfile">libvorbis</filename> and <filename
366 class="libraryfile">libtheora</filename>.
367 </para>
368
369 <para>
370 <parameter>--enable-libvorbis --enable-libvpx</parameter>: Enables WebM
371 encoding via <filename class="libraryfile">libvorbis</filename> and
372 <filename class="libraryfile">libvpx</filename>.
373 </para>
374
375 <para>
376 <parameter>--enable-libx264</parameter>: Enables high-quality
377 H.264/MPEG-4 AVC encoding via <filename
378 class="libraryfile">libx264</filename>.
379 </para>
380
381 <para>
382 <parameter>--enable-libx265</parameter>: Enables high-quality
383 H.265/HEVC encoding via <filename
384 class="libraryfile">libx265</filename>.
385 </para>
386
387 <para>
388 <parameter>--enable-x11grab</parameter>: Enables X11 grabbing.
389 </para>
390
391 <para>
392 <option>--enable-openssl</option> or <option>--enable-gnutls</option>:
393 Enables HTTPS protocol for network streams.
394 </para>
395
396 <para>
397 <command>gcc tools/qt-faststart.c -o tools/qt-faststart</command>: This
398 builds the <command>qt-faststart</command> program which can modify
399 QuickTime formatted movies (<filename class="extension">.mov</filename>
400 or <filename class="extension">.mp4</filename>) so that the header
401 information is located at the beginning of the file instead of the end.
402 This allows the movie file to begin playing before the entire file has
403 been downloaded.
404 </para>
405
406 <note>
407 <para>
408 Support for most of the dependency packages requires using options
409 passed to the <command>configure</command> script. View the output
410 from <command>./configure --help</command> for complete information
411 about enabling dependency packages.
412 </para>
413 </note>
414
415 </sect2>
416
417 <sect2 role="configuration">
418 <title>Configuring FFmpeg</title>
419
420 <sect3 id="ffmpeg-config">
421 <title>Config Files</title>
422
423 <para>
424 <filename>/etc/ffserver.conf</filename> and
425 <filename>~/.ffmpeg/ffserver-config</filename>
426 </para>
427
428 <indexterm zone="ffmpeg ffmpeg-config">
429 <primary
430 sortas="e-AA.ffmpeg-ffserver-config">~/.ffmpeg/ffserver-config</primary>
431 </indexterm>
432
433 <indexterm zone="ffmpeg ffmpeg-config">
434 <primary sortas="e-etc-ffserver.conf">/etc/ffserver.conf</primary>
435 </indexterm>
436
437 <para>
438 You'll find a sample <command>ffserver</command> configuration file at
439 <filename>doc/ffserver.conf</filename> in the source tree.
440 </para>
441
442 </sect3>
443
444 </sect2>
445
446 <sect2 role="content">
447 <title>Contents</title>
448
449 <segmentedlist>
450 <segtitle>Installed Programs</segtitle>
451 <segtitle>Installed Libraries</segtitle>
452 <segtitle>Installed Directories</segtitle>
453
454 <seglistitem>
455 <seg>
456 ffmpeg, ffplay, ffprobe, ffserver, and qt-faststart
457 </seg>
458 <seg>
459 libavcodec.so, libavdevice.so, libavfilter.so,
460 libavformat.so, libavutil.so, libpostproc.so,
461 libswresample.so, and libswscale.so
462 </seg>
463 <seg>
464 /usr/include/libav{codec,device,filter,format,util},
465 /usr/include/libpostproc,
466 /usr/include/libsw{resample,scale},
467 /usr/share/doc/ffmpeg-&ffmpeg-version;, and
468 /usr/share/ffmpeg
469 </seg>
470 </seglistitem>
471 </segmentedlist>
472
473 <variablelist>
474 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
475 <?dbfo list-presentation="list"?>
476 <?dbhtml list-presentation="table"?>
477
478 <varlistentry id="ffmpeg-prog">
479 <term><command>ffmpeg</command></term>
480 <listitem>
481 <para>
482 is a command-line tool to convert video files, network streams and
483 input from a TV card to several video formats.
484 </para>
485 <indexterm zone="ffmpeg ffmpeg-prog">
486 <primary sortas="b-ffmpeg">ffmpeg</primary>
487 </indexterm>
488 </listitem>
489 </varlistentry>
490
491 <varlistentry id="ffplay">
492 <term><command>ffplay</command></term>
493 <listitem>
494 <para>
495 is a very simple and portable media player using the
496 <filename>ffmpeg</filename> libraries and the SDL library.
497 </para>
498 <indexterm zone="ffmpeg ffplay">
499 <primary sortas="b-ffplay">ffplay</primary>
500 </indexterm>
501 </listitem>
502 </varlistentry>
503
504 <varlistentry id="ffprobe">
505 <term><command>ffprobe</command></term>
506 <listitem>
507 <para>
508 gathers information from multimedia streams and prints it in a human
509 and machine-readable fashion.
510 </para>
511 <indexterm zone="ffmpeg ffprobe">
512 <primary sortas="b-ffprobe">ffprobe</primary>
513 </indexterm>
514 </listitem>
515 </varlistentry>
516
517 <varlistentry id="ffserver">
518 <term><command>ffserver</command></term>
519 <listitem>
520 <para>
521 is a streaming server for everything that <command>ffmpeg</command>
522 could use as input (files, streams, TV card input, webcam, etc).
523 </para>
524 <indexterm zone="ffmpeg ffserver">
525 <primary sortas="b-ffserver">ffserver</primary>
526 </indexterm>
527 </listitem>
528 </varlistentry>
529
530 <varlistentry id="qt-faststart">
531 <term><command>qt-faststart</command></term>
532 <listitem>
533 <para>
534 moves the index file to the front of quicktime (mov/mp4) videos.
535 </para>
536 <indexterm zone="ffmpeg qt-faststart">
537 <primary sortas="b-qt-faststart">qt-faststart</primary>
538 </indexterm>
539 </listitem>
540 </varlistentry>
541
542 <varlistentry id="libavcodec">
543 <term><filename class="libraryfile">libavcodec.so</filename></term>
544 <listitem>
545 <para>
546 is a library containing the <application>FFmpeg</application> codecs
547 (both encoding and decoding).
548 </para>
549 <indexterm zone="ffmpeg libavcodec">
550 <primary sortas="c-libavcodec">libavcodec.so</primary>
551 </indexterm>
552 </listitem>
553 </varlistentry>
554
555 <varlistentry id="libavdevice">
556 <term><filename class="libraryfile">libavdevice.so</filename></term>
557 <listitem>
558 <para>
559 is the <application>FFmpeg</application> device handling library.
560 </para>
561 <indexterm zone="ffmpeg libavdevice">
562 <primary sortas="c-libavdevice">libavdevice.so</primary>
563 </indexterm>
564 </listitem>
565 </varlistentry>
566
567 <varlistentry id="libavfilter">
568 <term><filename class="libraryfile">libavfilter.so</filename></term>
569 <listitem>
570 <para>
571 is a library of filters that can alter video or audio between the
572 decoder and the encoder (or output).
573 </para>
574 <indexterm zone="ffmpeg libavfilter">
575 <primary sortas="c-libavfilter">libavfilter.so</primary>
576 </indexterm>
577 </listitem>
578 </varlistentry>
579
580 <varlistentry id="libavformat">
581 <term><filename class="libraryfile">libavformat.so</filename></term>
582 <listitem>
583 <para>
584 is a library containing the file formats handling (mux and demux
585 code for several formats) used by <command>ffplay</command> as well
586 as allowing the generation of audio or video streams.
587 </para>
588 <indexterm zone="ffmpeg libavformat">
589 <primary sortas="c-libavformat">libavformat.so</primary>
590 </indexterm>
591 </listitem>
592 </varlistentry>
593
594 <varlistentry id="libavutil">
595 <term><filename class="libraryfile">libavutil.so</filename></term>
596 <listitem>
597 <para>
598 is the <application>FFmpeg</application> utility library.
599 </para>
600 <indexterm zone="ffmpeg libavutil">
601 <primary sortas="c-libavutil">libavutil.so</primary>
602 </indexterm>
603 </listitem>
604 </varlistentry>
605
606 <varlistentry id="libpostproc">
607 <term><filename class="libraryfile">libpostproc.so</filename></term>
608 <listitem>
609 <para>
610 is the <application>FFmpeg</application> post processing library.
611 </para>
612 <indexterm zone="ffmpeg libpostproc">
613 <primary sortas="c-libpostproc">libpostproc.so</primary>
614 </indexterm>
615 </listitem>
616 </varlistentry>
617
618 <varlistentry id="libswresample">
619 <term><filename class="libraryfile">libswresample.so</filename></term>
620 <listitem>
621 <para>
622 is the <application>FFmpeg</application> audio rescaling library,
623 it contains functions for converting audio sample formats.
624 </para>
625 <indexterm zone="ffmpeg libswresample">
626 <primary sortas="c-libswresample">libswresample.so</primary>
627 </indexterm>
628 </listitem>
629 </varlistentry>
630
631 <varlistentry id="libswscale">
632 <term><filename class="libraryfile">libswscale.so</filename></term>
633 <listitem>
634 <para>
635 is the <application>FFmpeg</application> image rescaling library.
636 </para>
637 <indexterm zone="ffmpeg libswscale">
638 <primary sortas="c-libswscale">libswscale.so</primary>
639 </indexterm>
640 </listitem>
641 </varlistentry>
642
643 </variablelist>
644
645 </sect2>
646
647</sect1>
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