source: multimedia/videoutils/ffmpeg.xml@ dd9e0c3

systemd-13485
Last change on this file since dd9e0c3 was d7bee48, checked in by Douglas R. Reno <renodr@…>, 8 years ago

Sync to trunk r17332

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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 "beb5c69c671aba1386e7156fc2af1ab6">
10 <!ENTITY ffmpeg-size "7.1 MB">
11 <!ENTITY ffmpeg-buildsize "172 MB (add 1.6 GB for the FATE suite/tests
12 and 1.0 GB for the documentation)">
13 <!ENTITY ffmpeg-time "5.3 SBU (add 0.6 SBU for docs and 4.5 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 &lfs78_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>
101 <xref linkend="alsa-lib"/>,
102 <xref linkend="libva"/>,
103 <xref linkend="libvdpau"/> (with the corresponding driver package), and
104 <xref linkend="sdl"/>
105 </para>
106
107 <bridgehead renderas="sect4">Optional</bridgehead>
108 <para role="optional">
109 <xref linkend="faac"/>,
110 <xref linkend="fontconfig"/>,
111 <xref linkend="frei0r"/>,
112 <xref linkend="libcdio"/> (to identify and play CDs),
113 <xref linkend="libwebp"/>,
114 <xref linkend="opencv"/>,
115 <xref linkend="openjpeg"/>,
116 <xref linkend="openssl"/> or
117 <xref linkend="gnutls"/>,
118 <xref linkend="pulseaudio"/>,
119 <xref linkend="speex"/>,
120 <xref linkend="texlive"/>
121 (or <xref linkend="tl-installer"/>) for PDF and PS documentation,
122 <xref linkend="v4l-utils"/>,
123 <xref linkend="xvid"/>,
124 <xref linkend="x-window-system"/>,
125 <ulink url="http://www.speech.cs.cmu.edu/flite/">Flite</ulink>,
126 <ulink url="http://www.quut.com/gsm/">GSM</ulink>,
127 <ulink url="http://xhevc.com/en/hevc/decoder/download.jsp">HEVC/H.265</ulink>,
128 <!--<ulink url="http://www.ladspa.org/">LADSPA</ulink>,-->
129 <ulink url="http://tipok.org.ua/node/17">libaacplus</ulink>,
130 <ulink url="http://www.videolan.org/developers/libbluray.html">libbluray</ulink>,
131 <ulink url="http://caca.zoy.org/">libcaca</ulink>,
132 <ulink url="http://www.celt-codec.org/">libcelt</ulink>,
133 <ulink url="http://sourceforge.net/projects/libdc1394">libdc1394</ulink>,
134 <ulink url="https://www.videolan.org/developers/libdca.html">libdca</ulink>,
135 <ulink url="https://ieee1394.wiki.kernel.org/index.php/Libraries">libiec61883</ulink>,
136 <ulink url="https://github.com/dekkers/libilbc">libilbc</ulink>,
137 <ulink url="http://sourceforge.net/projects/modplug-xmms/">libmodplug</ulink>,
138 <ulink url="https://github.com/Distrotech/libnut">libnut</ulink> (Git checkout),
139 <ulink url="http://rtmpdump.mplayerhq.hu/">librtmp</ulink>,
140 <ulink url="http://www.libssh.org/">libssh</ulink>,
141 <!--<ulink url="http://xavs.sourceforge.net/">libxavs</ulink> (SVN checkout),-->
142 <ulink url="http://kcat.strangesoft.net/openal-releases/">OpenAL</ulink>,
143 <ulink url="http://sourceforge.net/projects/opencore-amr">OpenCore AMR</ulink>,
144 <!--<ulink url="http://diracvideo.org/">Schroedinger</ulink>,-->
145 <ulink url="http://sourceforge.net/projects/schrodinger/">Schroedinger</ulink>,
146 <ulink url="http://www.twolame.org/">TwoLAME</ulink>,
147 <ulink url="http://sourceforge.net/projects/opencore-amr/files/vo-aacenc/">vo-aaenc</ulink>,
148 <ulink url="http://sourceforge.net/projects/opencore-amr/files/vo-amrwbenc/">vo-amrwbenc</ulink>, and
149 <!--<ulink url="http://www.videolan.org/developers/x265.html">x265 (H.265/MPEG-H HEVC)</ulink>, and-->
150 <ulink url="http://zapping.sourceforge.net/ZVBI/">ZVBI</ulink>
151 </para>
152
153 <para condition="html" role="usernotes">
154 User Notes: <ulink url="&blfs-wiki;/ffmpeg"/>
155 </para>
156 </sect2>
157
158 <sect2 role="installation">
159 <title>Installation of FFmpeg</title>
160
161 <para>
162 Install <application>FFmpeg</application> by running the following
163 commands:
164 </para>
165
166<screen><userinput>sed -i 's/-lflite"/-lflite -lasound"/' configure &amp;&amp;
167
168./configure --prefix=/usr \
169 --enable-gpl \
170 --enable-version3 \
171 --enable-nonfree \
172 --disable-static \
173 --enable-shared \
174 --disable-debug \
175 --enable-libass \
176 --enable-libfdk-aac \
177 --enable-libfreetype \
178 --enable-libmp3lame \
179 --enable-libopus \
180 --enable-libtheora \
181 --enable-libvorbis \
182 --enable-libvpx \
183 --enable-libx264 \
184 --enable-libx265 \
185 --enable-x11grab \
186 --docdir=/usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
187
188make &amp;&amp;
189
190gcc tools/qt-faststart.c -o tools/qt-faststart</userinput></screen>
191
192 <para>
193 HTML documentation was built in the previous step. If you have
194 <xref linkend="texlive"/> installed and wish to build PDF and
195 Postscript versions of the documentation, issue the following commands:
196 </para>
197<!--
198<screen><userinput>sed -i '$s/$/\n\n@bye/' doc/{git-howto,nut,fate}.texi &amp;&amp;
199sed -i '/machine:i386/ s/\\/@backslashchar{}/g' doc/platform.texi &amp;&amp;
200-->
201<screen><userinput>pushd doc &amp;&amp;
202for DOCNAME in `basename -s .html *.html`
203do
204 texi2pdf -b $DOCNAME.texi &amp;&amp;
205 texi2dvi -b $DOCNAME.texi &amp;&amp;
206
207 dvips -o $DOCNAME.ps \
208 $DOCNAME.dvi
209done &amp;&amp;
210popd &amp;&amp;
211unset DOCNAME</userinput></screen>
212
213 <para>
214 If you have <xref linkend="doxygen"/> installed and wish to create the API
215 documentation (takes about 350 MB of space), issue the command
216 <command>doxygen doc/Doxyfile</command>.
217 </para>
218
219 <para>
220 The fate-suite tests include comparisons with installed files, and should
221 not be run before the package is installed. Therefore, if you desire to
222 run them, instructions are given further below.
223 </para>
224
225 <para>
226 Now, as the <systemitem class="username">root</systemitem> user:
227 </para>
228
229<screen role="root"><userinput>make install &amp;&amp;
230
231install -v -m755 tools/qt-faststart /usr/bin &amp;&amp;
232install -v -m644 doc/*.txt \
233 /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
234
235 <para>
236 If PDF and Postscript documentations were built, issue the following
237 commands, as the <systemitem class="username">root</systemitem> user, to
238 install them:
239 </para>
240
241<screen role="root"><userinput>install -v -m644 doc/*.pdf \
242 /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
243install -v -m644 doc/*.ps \
244 /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
245
246 <para>
247 If you used <command>doxygen</command> to create the API documentation,
248 install it (another 300 MB of space) by issuing the following commands
249 as the <systemitem class="username">root</systemitem> user:
250 </para>
251
252<screen role="root"><userinput>install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
253cp -vr doc/doxy/html/* /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
254find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type f -exec chmod -c 0644 \{} \; &amp;&amp;
255find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type d -exec chmod -c 0755 \{} \;</userinput></screen>
256
257 <para>
258 To properly test the installation you must have <xref linkend="rsync"/>
259 installed and follow the instructions for the <ulink
260 url="http://www.ffmpeg.org/fate.html"> FFmpeg Automated Testing
261 Environment</ulink> (FATE). First, about 958 MB of sample files used to
262 run FATE are downloaded with the command:
263 </para>
264
265<screen><userinput>make fate-rsync SAMPLES=fate-suite/</userinput></screen>
266
267 <para>
268 The <filename class="directory">fate-suite</filename> directory is
269 created and the files are downloaded there. That command actually runs an
270 rsync command, to obtain the sample files. You may want to compress and
271 keep this directory for testing again, in another system, or when a new
272 version of ffmpeg is launched. Then, you unpack the sample files in the
273 source directory, and run, again, the <command>make fate-rsync
274 ...</command> command above, to sync with the repository. Now, the
275 download size and time are drastically reduced. Estimated values in
276 "Package Information" do not include the download SBU. Some samples may
277 have been removed, in the new version, so, in order to be sure local and
278 server fate samples are identical, when you use previously saved samples,
279 run the following command:
280 </para>
281
282<screen><userinput><command>rsync -vrltLW --delete --timeout=60 --contimeout=60 \
283 rsync://fate-suite.ffmpeg.org/fate-suite/ fate-suite/</command></userinput></screen>
284
285 <para>
286 Next, FATE is executed, with the commands (you obtain a number of tests
287 larger than 2500):
288 </para>
289
290<screen><userinput>make fate THREADS=<replaceable>N</replaceable> SAMPLES=fate-suite/ | tee ../fate.log &amp;&amp;
291grep ^TEST ../fate.log | wc -l</userinput></screen>
292
293 <para>
294 where <replaceable>N</replaceable> is an integer,
295 <replaceable>N</replaceable> &le; number of threads in the system.
296 </para>
297
298 </sect2>
299
300 <sect2 role="commands">
301 <title>Command Explanations</title>
302
303 <para>
304 <command>sed -i ... configure</command>: This command adds the
305 <application>ALSA</application> library to the
306 <application>Flite</application> <envar>LDFLAGS</envar> variable and
307 enables the discovery of <application>Flite</application>.
308 </para>
309
310 <para>
311 <command>sed -i ... texi</command>: Fix some .texi files for
312 documentation builds.
313 </para>
314
315 <para>
316 <command>find ... ;</command>: Fix permissions of documentation files
317 and directories.
318 </para>
319
320 <para>
321 <option>--enable-libfreetype</option>: Enables
322 <application>Freetype</application> support.
323 </para>
324
325 <para>
326 <parameter>--enable-gpl</parameter>: Enables the use of GPL code and
327 permits support for postprocessing, swscale and many other features.
328 </para>
329
330 <para>
331 <parameter>--enable-version3</parameter>: Enables the use of (L)GPL
332 version 3 code.
333 </para>
334
335 <para>
336 <parameter>--enable-nonfree</parameter>: Enables the use of nonfree code.
337 Note that the resulting libraries and binaries will be unredistributable.
338 </para>
339
340 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
341 href="../../xincludes/static-libraries.xml"/>
342
343 <para>
344 <parameter>--enable-shared</parameter>: Enables building shared
345 libraries, otherwise only static libraries are built and installed.
346 </para>
347
348 <para>
349 <parameter>--disable-debug</parameter>: Disables building debugging
350 symbols into the programs and libraries.
351 </para>
352
353 <para>
354 <parameter>--enable-libass</parameter>: Enables ASS/SSA subtitle format
355 rendering via <filename class="libraryfile">libass</filename>.
356 </para>
357
358 <para>
359 <parameter>--enable-libfdk-aac</parameter>: Enables currently the
360 highest-quality AAC audio encoding via <filename
361 class="libraryfile">libfdk-aac</filename>.
362 </para>
363
364 <para>
365 <parameter>--enable-libmp3lame</parameter>: Enables MP3 audio encoding
366 via <filename class="libraryfile">libmp3lame</filename>.
367 </para>
368
369 <para>
370 <parameter>--enable-libvorbis --enable-libtheora</parameter>: Enables
371 Theora video encoding via <filename
372 class="libraryfile">libvorbis</filename> and <filename
373 class="libraryfile">libtheora</filename>.
374 </para>
375
376 <para>
377 <parameter>--enable-libvorbis --enable-libvpx</parameter>: Enables WebM
378 encoding via <filename class="libraryfile">libvorbis</filename> and
379 <filename class="libraryfile">libvpx</filename>.
380 </para>
381
382 <para>
383 <parameter>--enable-libx264</parameter>: Enables high-quality
384 H.264/MPEG-4 AVC encoding via <filename
385 class="libraryfile">libx264</filename>.
386 </para>
387
388 <para>
389 <parameter>--enable-libx265</parameter>: Enables high-quality
390 H.265/HEVC encoding via <filename
391 class="libraryfile">libx265</filename>.
392 </para>
393
394 <para>
395 <parameter>--enable-x11grab</parameter>: Enables X11 grabbing.
396 </para>
397
398 <para>
399 <option>--enable-openssl</option> or <option>--enable-gnutls</option>:
400 Enables HTTPS protocol for network streams.
401 </para>
402
403 <para>
404 <command>gcc tools/qt-faststart.c -o tools/qt-faststart</command>: This
405 builds the <command>qt-faststart</command> program which can modify
406 QuickTime formatted movies (<filename class="extension">.mov</filename>
407 or <filename class="extension">.mp4</filename>) so that the header
408 information is located at the beginning of the file instead of the end.
409 This allows the movie file to begin playing before the entire file has
410 been downloaded.
411 </para>
412
413 <note>
414 <para>
415 Support for most of the dependency packages requires using options
416 passed to the <command>configure</command> script. View the output
417 from <command>./configure --help</command> for complete information
418 about enabling dependency packages.
419 </para>
420 </note>
421
422 </sect2>
423
424 <sect2 role="configuration">
425 <title>Configuring FFmpeg</title>
426
427 <sect3 id="ffmpeg-config">
428 <title>Config Files</title>
429
430 <para>
431 <filename>/etc/ffserver.conf</filename> and
432 <filename>~/.ffmpeg/ffserver-config</filename>
433 </para>
434
435 <indexterm zone="ffmpeg ffmpeg-config">
436 <primary
437 sortas="e-AA.ffmpeg-ffserver-config">~/.ffmpeg/ffserver-config</primary>
438 </indexterm>
439
440 <indexterm zone="ffmpeg ffmpeg-config">
441 <primary sortas="e-etc-ffserver.conf">/etc/ffserver.conf</primary>
442 </indexterm>
443
444 <para>
445 You'll find a sample <command>ffserver</command> configuration file at
446 <filename>doc/ffserver.conf</filename> in the source tree.
447 </para>
448
449 </sect3>
450
451 </sect2>
452
453 <sect2 role="content">
454 <title>Contents</title>
455
456 <segmentedlist>
457 <segtitle>Installed Programs</segtitle>
458 <segtitle>Installed Libraries</segtitle>
459 <segtitle>Installed Directories</segtitle>
460
461 <seglistitem>
462 <seg>
463 ffmpeg, ffplay, ffprobe, ffserver, and qt-faststart
464 </seg>
465 <seg>
466 libavcodec.so, libavdevice.so, libavfilter.so,
467 libavformat.so, libavutil.so, libpostproc.so,
468 libswresample, and libswscale.so
469 </seg>
470 <seg>
471 /usr/include/libav{codec,device,filter,format,util},
472 /usr/include/libpostproc,
473 /usr/include/libsw{resample,scale},
474 /usr/share/doc/ffmpeg-&ffmpeg-version;, and
475 /usr/share/ffmpeg
476 </seg>
477 </seglistitem>
478 </segmentedlist>
479
480 <variablelist>
481 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
482 <?dbfo list-presentation="list"?>
483 <?dbhtml list-presentation="table"?>
484
485 <varlistentry id="ffmpeg-prog">
486 <term><command>ffmpeg</command></term>
487 <listitem>
488 <para>
489 is a command-line tool to convert video files, network streams and
490 input from a TV card to several video formats.
491 </para>
492 <indexterm zone="ffmpeg ffmpeg-prog">
493 <primary sortas="b-ffmpeg">ffmpeg</primary>
494 </indexterm>
495 </listitem>
496 </varlistentry>
497
498 <varlistentry id="ffplay">
499 <term><command>ffplay</command></term>
500 <listitem>
501 <para>
502 is a very simple and portable media player using the
503 <filename>ffmpeg</filename> libraries and the SDL library.
504 </para>
505 <indexterm zone="ffmpeg ffplay">
506 <primary sortas="b-ffplay">ffplay</primary>
507 </indexterm>
508 </listitem>
509 </varlistentry>
510
511 <varlistentry id="ffprobe">
512 <term><command>ffprobe</command></term>
513 <listitem>
514 <para>
515 gathers information from multimedia streams and prints it in a human
516 and machine-readable fashion.
517 </para>
518 <indexterm zone="ffmpeg ffprobe">
519 <primary sortas="b-ffprobe">ffprobe</primary>
520 </indexterm>
521 </listitem>
522 </varlistentry>
523
524 <varlistentry id="ffserver">
525 <term><command>ffserver</command></term>
526 <listitem>
527 <para>
528 is a streaming server for everything that <command>ffmpeg</command>
529 could use as input (files, streams, TV card input, webcam, etc).
530 </para>
531 <indexterm zone="ffmpeg ffserver">
532 <primary sortas="b-ffserver">ffserver</primary>
533 </indexterm>
534 </listitem>
535 </varlistentry>
536
537 <varlistentry id="qt-faststart">
538 <term><command>qt-faststart</command></term>
539 <listitem>
540 <para>
541 moves the index file to the front of quicktime (mov/mp4) videos.
542 </para>
543 <indexterm zone="ffmpeg qt-faststart">
544 <primary sortas="b-qt-faststart">qt-faststart</primary>
545 </indexterm>
546 </listitem>
547 </varlistentry>
548
549 <varlistentry id="libavcodec">
550 <term><filename class="libraryfile">libavcodec.so</filename></term>
551 <listitem>
552 <para>
553 is a library containing the <application>FFmpeg</application> codecs
554 (both encoding and decoding).
555 </para>
556 <indexterm zone="ffmpeg libavcodec">
557 <primary sortas="c-libavcodec">libavcodec.so</primary>
558 </indexterm>
559 </listitem>
560 </varlistentry>
561
562 <varlistentry id="libavdevice">
563 <term><filename class="libraryfile">libavdevice.so</filename></term>
564 <listitem>
565 <para>
566 is the <application>FFmpeg</application> device handling library.
567 </para>
568 <indexterm zone="ffmpeg libavdevice">
569 <primary sortas="c-libavdevice">libavdevice.so</primary>
570 </indexterm>
571 </listitem>
572 </varlistentry>
573
574 <varlistentry id="libavfilter">
575 <term><filename class="libraryfile">libavfilter.so</filename></term>
576 <listitem>
577 <para>
578 is a library of filters that can alter video or audio between the
579 decoder and the encoder (or output).
580 </para>
581 <indexterm zone="ffmpeg libavfilter">
582 <primary sortas="c-libavfilter">libavfilter.so</primary>
583 </indexterm>
584 </listitem>
585 </varlistentry>
586
587 <varlistentry id="libavformat">
588 <term><filename class="libraryfile">libavformat.so</filename></term>
589 <listitem>
590 <para>
591 is a library containing the file formats handling (mux and demux
592 code for several formats) used by <command>ffplay</command> as well
593 as allowing the generation of audio or video streams.
594 </para>
595 <indexterm zone="ffmpeg libavformat">
596 <primary sortas="c-libavformat">libavformat.so</primary>
597 </indexterm>
598 </listitem>
599 </varlistentry>
600
601 <varlistentry id="libavutil">
602 <term><filename class="libraryfile">libavutil.so</filename></term>
603 <listitem>
604 <para>
605 is the <application>FFmpeg</application> utility library.
606 </para>
607 <indexterm zone="ffmpeg libavutil">
608 <primary sortas="c-libavutil">libavutil.so</primary>
609 </indexterm>
610 </listitem>
611 </varlistentry>
612
613 <varlistentry id="libpostproc">
614 <term><filename class="libraryfile">libpostproc.so</filename></term>
615 <listitem>
616 <para>
617 is the <application>FFmpeg</application> post processing library.
618 </para>
619 <indexterm zone="ffmpeg libpostproc">
620 <primary sortas="c-libpostproc">libpostproc.so</primary>
621 </indexterm>
622 </listitem>
623 </varlistentry>
624
625 <varlistentry id="libswresample">
626 <term><filename class="libraryfile">libswresample.so</filename></term>
627 <listitem>
628 <para>
629 is the <application>FFmpeg</application> audio rescaling library,
630 it contains functions for converting audio sample formats.
631 </para>
632 <indexterm zone="ffmpeg libswresample">
633 <primary sortas="c-libswresample">libswresample.so</primary>
634 </indexterm>
635 </listitem>
636 </varlistentry>
637
638 <varlistentry id="libswscale">
639 <term><filename class="libraryfile">libswscale.so</filename></term>
640 <listitem>
641 <para>
642 is the <application>FFmpeg</application> image rescaling library.
643 </para>
644 <indexterm zone="ffmpeg libswscale">
645 <primary sortas="c-libswscale">libswscale.so</primary>
646 </indexterm>
647 </listitem>
648 </varlistentry>
649
650 </variablelist>
651
652 </sect2>
653
654</sect1>
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