source: multimedia/videoutils/ffmpeg.xml@ 0e29df6

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 0e29df6 was 0e29df6, checked in by Bruce Dubbs <bdubbs@…>, 5 years ago

Update to libepoxy-1.4.0.
Update to xfce4-terminal-0.8.4.
Update to ffmpeg-3.2.3.
Update to List-AllUtils-0.14 (Perl Module).

git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@18274 af4574ff-66df-0310-9fd7-8a98e5e911e0

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File size: 23.0 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 "4f01244929a992bc5bae4136f329f4b1">
10 <!ENTITY ffmpeg-size "7.6 MB">
11 <!ENTITY ffmpeg-buildsize "145 MB (add 2.9 GB for the FATE suite/tests
12 and 1.0 GB for the documentation)">
13 <!ENTITY ffmpeg-time "4.5 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 /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
231
232 <para>
233 If PDF and Postscript documentations were built, issue the following
234 commands, as the <systemitem class="username">root</systemitem> user, to
235 install them:
236 </para>
237
238<screen role="root"><userinput>install -v -m644 doc/*.pdf /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
239install -v -m644 doc/*.ps /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
240
241 <para>
242 If you used <command>doxygen</command> to create the API documentation,
243 install it (another 500 MB of space) by issuing the following commands
244 as the <systemitem class="username">root</systemitem> user:
245 </para>
246
247<screen role="root"><userinput>install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
248cp -vr doc/doxy/html/* /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
249find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type f -exec chmod -c 0644 \{} \; &amp;&amp;
250find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type d -exec chmod -c 0755 \{} \;</userinput></screen>
251
252 <para>
253 To properly test the installation you must have <xref linkend="rsync"/>
254 installed and follow the instructions for the <ulink
255 url="http://www.ffmpeg.org/fate.html"> FFmpeg Automated Testing
256 Environment</ulink> (FATE). First, about 1 GB of sample files used to
257 run FATE are downloaded with the command:
258 </para>
259
260<screen><userinput>make fate-rsync SAMPLES=fate-suite/</userinput></screen>
261
262 <para>
263 The <filename class="directory">fate-suite</filename> directory is
264 created and the files are downloaded there. That command actually runs an
265 rsync command, to obtain the sample files. You may want to compress and
266 keep this directory for testing again, in another system, or when a new
267 version of ffmpeg is launched. Then, you unpack the sample files in the
268 source directory, and run, again, the <command>make fate-rsync
269 ...</command> command above, to sync with the repository. Now, the
270 download size and time are drastically reduced. Estimated values in
271 "Package Information" do not include the download SBU. Some samples may
272 have been removed, in the new version, so, in order to be sure local and
273 server fate samples are identical, when you use previously saved samples,
274 run the following command:
275 </para>
276
277<screen><userinput><command>rsync -vrltLW --delete --timeout=60 --contimeout=60 \
278 rsync://fate-suite.ffmpeg.org/fate-suite/ fate-suite/</command></userinput></screen>
279
280 <para>
281 Next, FATE is executed, with the commands (you obtain a number of tests
282 larger than 3000):
283 </para>
284
285<screen><userinput>make fate THREADS=<replaceable>N</replaceable> SAMPLES=fate-suite/ | tee ../fate.log &amp;&amp;
286grep ^TEST ../fate.log | wc -l</userinput></screen>
287
288 <para>
289 where <replaceable>N</replaceable> is an integer,
290 <replaceable>N</replaceable> &le; number of cores in the system.
291 </para>
292
293 </sect2>
294
295 <sect2 role="commands">
296 <title>Command Explanations</title>
297
298 <para>
299 <command>sed -i ... configure</command>: This command adds the
300 <application>ALSA</application> library to the
301 <application>Flite</application> <envar>LDFLAGS</envar> variable and
302 enables the discovery of <application>Flite</application>.
303 </para>
304
305 <para>
306 <command>find ... ;</command>: Fix permissions of documentation files
307 and directories.
308 </para>
309
310 <para>
311 <parameter>--enable-libfreetype</parameter>: Enables
312 <application>Freetype</application> support.
313 </para>
314
315 <para>
316 <parameter>--enable-gpl</parameter>: Enables the use of GPL code and
317 permits support for postprocessing, swscale and many other features.
318 </para>
319
320 <para>
321 <parameter>--enable-version3</parameter>: Enables the use of (L)GPL
322 version 3 code.
323 </para>
324
325 <para>
326 <parameter>--enable-nonfree</parameter>: Enables the use of nonfree code.
327 Note that the resulting libraries and binaries will be unredistributable.
328 </para>
329
330 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
331 href="../../xincludes/static-libraries.xml"/>
332
333 <para>
334 <parameter>--enable-shared</parameter>: Enables building shared
335 libraries, otherwise only static libraries are built and installed.
336 </para>
337
338 <para>
339 <parameter>--disable-debug</parameter>: Disables building debugging
340 symbols into the programs and libraries.
341 </para>
342
343 <para>
344 <parameter>--enable-libass</parameter>: Enables ASS/SSA subtitle format
345 rendering via <filename class="libraryfile">libass</filename>.
346 </para>
347
348 <para>
349 <parameter>--enable-libfdk-aac</parameter>: Enables currently the
350 highest-quality AAC audio encoding via <filename
351 class="libraryfile">libfdk-aac</filename>.
352 </para>
353
354 <para>
355 <parameter>--enable-libmp3lame</parameter>: Enables MP3 audio encoding
356 via <filename class="libraryfile">libmp3lame</filename>.
357 </para>
358
359 <para>
360 <parameter>--enable-libvorbis --enable-libtheora</parameter>: Enables
361 Theora video encoding via <filename
362 class="libraryfile">libvorbis</filename> and <filename
363 class="libraryfile">libtheora</filename>.
364 </para>
365
366 <para>
367 <parameter>--enable-libvorbis --enable-libvpx</parameter>: Enables WebM
368 encoding via <filename class="libraryfile">libvorbis</filename> and
369 <filename class="libraryfile">libvpx</filename>.
370 </para>
371
372 <para>
373 <parameter>--enable-libx264</parameter>: Enables high-quality
374 H.264/MPEG-4 AVC encoding via <filename
375 class="libraryfile">libx264</filename>.
376 </para>
377
378 <para>
379 <parameter>--enable-libx265</parameter>: Enables high-quality
380 H.265/HEVC encoding via <filename
381 class="libraryfile">libx265</filename>.
382 </para>
383
384 <para>
385 <parameter>--enable-x11grab</parameter>: Enables X11 grabbing.
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 <command>gcc tools/qt-faststart.c -o tools/qt-faststart</command>: This
395 builds the <command>qt-faststart</command> program which can modify
396 QuickTime formatted movies (<filename class="extension">.mov</filename>
397 or <filename class="extension">.mp4</filename>) so that the header
398 information is located at the beginning of the file instead of the end.
399 This allows the movie file to begin playing before the entire file has
400 been downloaded.
401 </para>
402
403 <note>
404 <para>
405 Support for most of the dependency packages requires using options
406 passed to the <command>configure</command> script. View the output
407 from <command>./configure --help</command> for complete information
408 about enabling dependency packages.
409 </para>
410 </note>
411
412 </sect2>
413
414 <sect2 role="configuration">
415 <title>Configuring FFmpeg</title>
416
417 <sect3 id="ffmpeg-config">
418 <title>Config Files</title>
419
420 <para>
421 <filename>/etc/ffserver.conf</filename> and
422 <filename>~/.ffmpeg/ffserver-config</filename>
423 </para>
424
425 <indexterm zone="ffmpeg ffmpeg-config">
426 <primary
427 sortas="e-AA.ffmpeg-ffserver-config">~/.ffmpeg/ffserver-config</primary>
428 </indexterm>
429
430 <indexterm zone="ffmpeg ffmpeg-config">
431 <primary sortas="e-etc-ffserver.conf">/etc/ffserver.conf</primary>
432 </indexterm>
433
434 <para>
435 You'll find a sample <command>ffserver</command> configuration file at
436 <filename>doc/ffserver.conf</filename> in the source tree.
437 </para>
438
439 </sect3>
440
441 </sect2>
442
443 <sect2 role="content">
444 <title>Contents</title>
445
446 <segmentedlist>
447 <segtitle>Installed Programs</segtitle>
448 <segtitle>Installed Libraries</segtitle>
449 <segtitle>Installed Directories</segtitle>
450
451 <seglistitem>
452 <seg>
453 ffmpeg, ffplay, ffprobe, ffserver, and qt-faststart
454 </seg>
455 <seg>
456 libavcodec.so, libavdevice.so, libavfilter.so,
457 libavformat.so, libavutil.so, libpostproc.so,
458 libswresample.so, and libswscale.so
459 </seg>
460 <seg>
461 /usr/include/libav{codec,device,filter,format,util},
462 /usr/include/libpostproc,
463 /usr/include/libsw{resample,scale},
464 /usr/share/doc/ffmpeg-&ffmpeg-version;, and
465 /usr/share/ffmpeg
466 </seg>
467 </seglistitem>
468 </segmentedlist>
469
470 <variablelist>
471 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
472 <?dbfo list-presentation="list"?>
473 <?dbhtml list-presentation="table"?>
474
475 <varlistentry id="ffmpeg-prog">
476 <term><command>ffmpeg</command></term>
477 <listitem>
478 <para>
479 is a command-line tool to convert video files, network streams and
480 input from a TV card to several video formats.
481 </para>
482 <indexterm zone="ffmpeg ffmpeg-prog">
483 <primary sortas="b-ffmpeg">ffmpeg</primary>
484 </indexterm>
485 </listitem>
486 </varlistentry>
487
488 <varlistentry id="ffplay">
489 <term><command>ffplay</command></term>
490 <listitem>
491 <para>
492 is a very simple and portable media player using the
493 <filename>ffmpeg</filename> libraries and the SDL library.
494 </para>
495 <indexterm zone="ffmpeg ffplay">
496 <primary sortas="b-ffplay">ffplay</primary>
497 </indexterm>
498 </listitem>
499 </varlistentry>
500
501 <varlistentry id="ffprobe">
502 <term><command>ffprobe</command></term>
503 <listitem>
504 <para>
505 gathers information from multimedia streams and prints it in a human
506 and machine-readable fashion.
507 </para>
508 <indexterm zone="ffmpeg ffprobe">
509 <primary sortas="b-ffprobe">ffprobe</primary>
510 </indexterm>
511 </listitem>
512 </varlistentry>
513
514 <varlistentry id="ffserver">
515 <term><command>ffserver</command></term>
516 <listitem>
517 <para>
518 is a streaming server for everything that <command>ffmpeg</command>
519 could use as input (files, streams, TV card input, webcam, etc).
520 </para>
521 <indexterm zone="ffmpeg ffserver">
522 <primary sortas="b-ffserver">ffserver</primary>
523 </indexterm>
524 </listitem>
525 </varlistentry>
526
527 <varlistentry id="qt-faststart">
528 <term><command>qt-faststart</command></term>
529 <listitem>
530 <para>
531 moves the index file to the front of quicktime (mov/mp4) videos.
532 </para>
533 <indexterm zone="ffmpeg qt-faststart">
534 <primary sortas="b-qt-faststart">qt-faststart</primary>
535 </indexterm>
536 </listitem>
537 </varlistentry>
538
539 <varlistentry id="libavcodec">
540 <term><filename class="libraryfile">libavcodec.so</filename></term>
541 <listitem>
542 <para>
543 is a library containing the <application>FFmpeg</application> codecs
544 (both encoding and decoding).
545 </para>
546 <indexterm zone="ffmpeg libavcodec">
547 <primary sortas="c-libavcodec">libavcodec.so</primary>
548 </indexterm>
549 </listitem>
550 </varlistentry>
551
552 <varlistentry id="libavdevice">
553 <term><filename class="libraryfile">libavdevice.so</filename></term>
554 <listitem>
555 <para>
556 is the <application>FFmpeg</application> device handling library.
557 </para>
558 <indexterm zone="ffmpeg libavdevice">
559 <primary sortas="c-libavdevice">libavdevice.so</primary>
560 </indexterm>
561 </listitem>
562 </varlistentry>
563
564 <varlistentry id="libavfilter">
565 <term><filename class="libraryfile">libavfilter.so</filename></term>
566 <listitem>
567 <para>
568 is a library of filters that can alter video or audio between the
569 decoder and the encoder (or output).
570 </para>
571 <indexterm zone="ffmpeg libavfilter">
572 <primary sortas="c-libavfilter">libavfilter.so</primary>
573 </indexterm>
574 </listitem>
575 </varlistentry>
576
577 <varlistentry id="libavformat">
578 <term><filename class="libraryfile">libavformat.so</filename></term>
579 <listitem>
580 <para>
581 is a library containing the file formats handling (mux and demux
582 code for several formats) used by <command>ffplay</command> as well
583 as allowing the generation of audio or video streams.
584 </para>
585 <indexterm zone="ffmpeg libavformat">
586 <primary sortas="c-libavformat">libavformat.so</primary>
587 </indexterm>
588 </listitem>
589 </varlistentry>
590
591 <varlistentry id="libavutil">
592 <term><filename class="libraryfile">libavutil.so</filename></term>
593 <listitem>
594 <para>
595 is the <application>FFmpeg</application> utility library.
596 </para>
597 <indexterm zone="ffmpeg libavutil">
598 <primary sortas="c-libavutil">libavutil.so</primary>
599 </indexterm>
600 </listitem>
601 </varlistentry>
602
603 <varlistentry id="libpostproc">
604 <term><filename class="libraryfile">libpostproc.so</filename></term>
605 <listitem>
606 <para>
607 is the <application>FFmpeg</application> post processing library.
608 </para>
609 <indexterm zone="ffmpeg libpostproc">
610 <primary sortas="c-libpostproc">libpostproc.so</primary>
611 </indexterm>
612 </listitem>
613 </varlistentry>
614
615 <varlistentry id="libswresample">
616 <term><filename class="libraryfile">libswresample.so</filename></term>
617 <listitem>
618 <para>
619 is the <application>FFmpeg</application> audio rescaling library,
620 it contains functions for converting audio sample formats.
621 </para>
622 <indexterm zone="ffmpeg libswresample">
623 <primary sortas="c-libswresample">libswresample.so</primary>
624 </indexterm>
625 </listitem>
626 </varlistentry>
627
628 <varlistentry id="libswscale">
629 <term><filename class="libraryfile">libswscale.so</filename></term>
630 <listitem>
631 <para>
632 is the <application>FFmpeg</application> image rescaling library.
633 </para>
634 <indexterm zone="ffmpeg libswscale">
635 <primary sortas="c-libswscale">libswscale.so</primary>
636 </indexterm>
637 </listitem>
638 </varlistentry>
639
640 </variablelist>
641
642 </sect2>
643
644</sect1>
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