source: multimedia/videoutils/ffmpeg.xml@ 60d53ec3

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Last change on this file since 60d53ec3 was 60d53ec3, checked in by Bruce Dubbs <bdubbs@…>, 6 years ago

Tags and some minor formatting

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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 "7eb2140bab9f0a8669b65b50c8e4cfb5">
10 <!ENTITY ffmpeg-size "7.8 MB">
11 <!ENTITY ffmpeg-buildsize "1.1 GB (with optional docs); additional 2.3 GB to run the FATE suite)">
12 <!ENTITY ffmpeg-time "1.8 SBU (with -j4 and optional docs); additional 2.8 SBU, with THREADS=4, 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 &lfs78_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"/>, and
93 <xref linkend="yasm"/>
94 </para>
95
96 <bridgehead renderas="sect4">Recommended for desktop use</bridgehead>
97 <para>
98 <xref linkend="alsa-lib"/>,
99 <xref linkend="libva"/>,
100 <xref linkend="libvdpau"/> (with the corresponding driver package), and
101 <xref linkend="sdl"/>
102 </para>
103
104 <bridgehead renderas="sect4">Optional</bridgehead>
105 <para role="optional">
106 <xref linkend="faac"/>,
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="openjpeg"/>,
113 <xref linkend="openssl"/> or
114 <xref linkend="gnutls"/>,
115 <xref linkend="pulseaudio"/>,
116 <xref linkend="speex"/>,
117 <xref linkend="texlive"/>
118 (or <xref linkend="tl-installer"/>) for PDF and PS documentation,
119 <xref linkend="v4l-utils"/>,
120 <xref linkend="xvid"/>,
121 <xref linkend="x-window-system"/>,
122 <ulink url="http://www.speech.cs.cmu.edu/flite/">Flite</ulink>,
123 <ulink url="http://www.quut.com/gsm/">GSM</ulink>,
124 <ulink url="http://xhevc.com/en/hevc/decoder/download.jsp">HEVC/H.265</ulink>,
125 <ulink url="http://www.ladspa.org/">LADSPA</ulink>,
126 <ulink url="http://tipok.org.ua/node/17">libaacplus</ulink>,
127 <ulink url="http://www.videolan.org/developers/libbluray.html">libbluray</ulink>,
128 <ulink url="http://caca.zoy.org/">libcaca</ulink>,
129 <ulink url="http://www.celt-codec.org/">libcelt</ulink>,
130 <ulink url="http://sourceforge.net/projects/libdc1394">libdc1394</ulink>,
131 <ulink url="https://www.videolan.org/developers/libdca.html">libdca</ulink>,
132 <ulink url="https://ieee1394.wiki.kernel.org/index.php/Libraries">libiec61883</ulink>,
133 <ulink url="https://github.com/dekkers/libilbc">libilbc</ulink>,
134 <ulink url="http://sourceforge.net/projects/modplug-xmms/">libmodplug</ulink>,
135 <ulink url="https://github.com/Distrotech/libnut">libnut</ulink> (Git checkout),
136 <ulink url="http://rtmpdump.mplayerhq.hu/">librtmp</ulink>,
137 <ulink url="http://www.libssh.org/">libssh</ulink>,
138 <ulink url="http://xavs.sourceforge.net/">libxavs</ulink> (SVN checkout),
139 <ulink url="http://kcat.strangesoft.net/openal-releases/">OpenAL</ulink>,
140 <ulink url="http://sourceforge.net/projects/opencore-amr">OpenCore AMR</ulink>,
141 <ulink url="http://diracvideo.org/">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>,
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 If <application>Xorg</application> is installed in a prefix other
159 than <filename class='directory'>/usr</filename>, the build will fail. Fix
160 this by issuing the following command:
161 </para>
162
163<screen><userinput>export LIBRARY_PATH=$XORG_PREFIX/lib</userinput></screen>
164-->
165 <para>
166 Install <application>FFmpeg</application> by running the following
167 commands:
168 </para>
169
170<screen><userinput>sed -i 's/-lflite"/-lflite -lasound"/' configure &amp;&amp;
171
172./configure --prefix=/usr \
173 --enable-gpl \
174 --enable-version3 \
175 --enable-nonfree \
176 --disable-static \
177 --enable-shared \
178 --disable-debug \
179 --enable-libass \
180 --enable-libfdk-aac \
181 --enable-libfreetype \
182 --enable-libmp3lame \
183 --enable-libopus \
184 --enable-libtheora \
185 --enable-libvorbis \
186 --enable-libvpx \
187 --enable-libx264 \
188 --enable-x11grab \
189 --docdir=/usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
190
191make &amp;&amp;
192
193gcc tools/qt-faststart.c -o tools/qt-faststart</userinput></screen>
194<!--
195unset LIBRARY_PATH</userinput></screen>-->
196
197 <para>
198 HTML documentation was built in the previous step. If you have
199 <xref linkend="texlive"/> installed and wish to build PDF and
200 Postscript versions of the documentation, issue the following commands:
201 </para>
202
203<screen><userinput>sed -i '$s/$/\n\n@bye/' doc/{git-howto,nut,fate}.texi &amp;&amp;
204sed -i '/machine:i386/ s/\\/@backslashchar{}/g' doc/platform.texi &amp;&amp;
205
206pushd doc &amp;&amp;
207for DOCNAME in `basename -s .html *.html`
208do
209 texi2pdf -b $DOCNAME.texi &amp;&amp;
210 texi2dvi -b $DOCNAME.texi &amp;&amp;
211
212 dvips -o $DOCNAME.ps \
213 $DOCNAME.dvi
214done &amp;&amp;
215popd &amp;&amp;
216unset DOCNAME</userinput></screen>
217
218 <para>
219 If you have <xref linkend="doxygen"/> installed and wish to create the API
220 documentation (takes about 350 MB of space), issue the command
221 <command>doxygen doc/Doxyfile</command>.
222 </para>
223
224 <para>
225 The fate-suite tests include comparisons with installed files, and should
226 not be run before the package is installed. Therefore, if you desire to
227 run them, instructions are given further below.
228 </para>
229
230 <para>
231 Now, as the <systemitem class="username">root</systemitem> user:
232 </para>
233
234<screen role="root"><userinput>make install &amp;&amp;
235
236install -v -m755 tools/qt-faststart /usr/bin &amp;&amp;
237install -v -m644 doc/*.txt \
238 /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
239
240 <para>
241 If PDF and Postscript documentations were built, issue the following
242 commands, as the <systemitem class="username">root</systemitem> user, to
243 install them:
244 </para>
245
246<screen role="root"><userinput>install -v -m644 doc/*.pdf \
247 /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
248install -v -m644 doc/*.ps \
249 /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
250
251 <para>
252 If you used <command>doxygen</command> to create the API documentation,
253 install it (another 300 MB of space) by issuing the following commands
254 as the <systemitem class="username">root</systemitem> user:
255 </para>
256
257<screen role="root"><userinput>install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
258cp -vr doc/doxy/html/* /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
259find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type f -exec chmod -c 0644 \{} \; &amp;&amp;
260find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type d -exec chmod -c 0755 \{} \;</userinput></screen>
261
262 <para>
263 To properly test the installation you must have <xref linkend="rsync"/>
264 installed and follow the instructions for the <ulink
265 url="http://www.ffmpeg.org/fate.html"> FFmpeg Automated Testing
266 Environment</ulink> (FATE). First, about 930 MB of sample files used to
267 run FATE are downloaded with the command:
268 </para>
269
270<screen><userinput>make fate-rsync SAMPLES=fate-suite/</userinput></screen>
271
272 <para>
273 The <filename class="directory">fate-suite</filename> directory is
274 created and the files are downloaded there. That command actually runs an
275 rsync command, to obtain the sample files. You may want to compress and
276 keep this directory for testing again, in another system, or when a new
277 version of ffmpeg is launched. Then, you unpack the sample files in the
278 source directory, and run, again, the <command>make fate-rsync
279 ...</command> command above, to sync with the repository. Now, the
280 download size and time are drastically reduced. Estimated values in
281 "Package Information" do not include the download SBU. Some samples may
282 have been removed, in the new version, so, in order to be sure local and
283 server fate samples are identical, when you use previously saved samples,
284 run the following command:
285 </para>
286
287<screen><userinput><command>rsync -vrltLW --delete --timeout=60 --contimeout=60 \
288 rsync://fate-suite.ffmpeg.org/fate-suite/ fate-suite/</command></userinput></screen>
289
290 <para>
291 Next, FATE is executed, with the commands (you obtain a number of tests
292 larger than 2400):
293 </para>
294
295<screen><userinput>make fate THREADS=<replaceable>N</replaceable> SAMPLES=fate-suite/ | tee ../fate.log &amp;&amp;
296grep ^TEST ../fate.log | wc -l</userinput></screen>
297
298 <para>
299 where <replaceable>N</replaceable> is an integer,
300 <replaceable>N</replaceable> &le; number of threads in the system.
301 </para>
302
303 </sect2>
304
305 <sect2 role="commands">
306 <title>Command Explanations</title>
307
308 <para>
309 <command>sed -i ... configure</command>: This command adds the
310 <application>ALSA</application> library to the
311 <application>Flite</application> <envar>LDFLAGS</envar> variable and
312 enables the discovery of <application>Flite</application>.
313 </para>
314
315 <para>
316 <command>sed -i ... texi</command>: Fix some .texi files for
317 documentation builds.
318 </para>
319
320 <para>
321 <command>find ... ;</command>: Fix permissions of documentation files
322 and directories.
323 </para>
324
325 <para>
326 <option>--enable-libfreetype</option>: Enables
327 <application>Freetype</application> support.
328 </para>
329
330 <para>
331 <parameter>--enable-gpl</parameter>: Enables the use of GPL code and
332 permits support for postprocessing, swscale and many other features.
333 </para>
334
335 <para>
336 <parameter>--enable-version3</parameter>: Enables the use of (L)GPL
337 version 3 code.
338 </para>
339
340 <para>
341 <parameter>--enable-nonfree</parameter>: Enables the use of nonfree code.
342 Note that the resulting libraries and binaries will be unredistributable.
343 </para>
344
345 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
346 href="../../xincludes/static-libraries.xml"/>
347
348 <para>
349 <parameter>--enable-shared</parameter>: Enables building shared
350 libraries, otherwise only static libraries are built and installed.
351 </para>
352
353 <para>
354 <parameter>--disable-debug</parameter>: Disables building debugging
355 symbols into the programs and libraries.
356 </para>
357
358 <para>
359 <parameter>--enable-libass</parameter>: Enables ASS/SSA subtitle format
360 rendering via <filename class="libraryfile">libass</filename>.
361 </para>
362
363 <para>
364 <parameter>--enable-libfdk-aac</parameter>: Enables currently the
365 highest-quality AAC audio encoding via <filename
366 class="libraryfile">libfdk-aac</filename>.
367 </para>
368
369 <para>
370 <parameter>--enable-libmp3lame</parameter>: Enables MP3 audio encoding
371 via <filename class="libraryfile">libmp3lame</filename>.
372 </para>
373
374 <para>
375 <parameter>--enable-libvorbis --enable-libtheora</parameter>: Enables
376 Theora video encoding via <filename
377 class="libraryfile">libvorbis</filename> and <filename
378 class="libraryfile">libtheora</filename>.
379 </para>
380
381 <para>
382 <parameter>--enable-libvorbis --enable-libvpx</parameter>: Enables WebM
383 encoding via <filename class="libraryfile">libvorbis</filename> and
384 <filename class="libraryfile">libvpx</filename>.
385 </para>
386
387 <para>
388 <parameter>--enable-libx264</parameter>: Enables high-quality
389 H.264/MPEG-4 AVC encoding via <filename
390 class="libraryfile">libx264</filename>.
391 </para>
392
393 <para>
394 <parameter>--enable-x11grab</parameter>: Enables X11 grabbing.
395 </para>
396
397 <para>
398 <option>--enable-openssl</option> or <option>--enable-gnutls</option>:
399 Enables HTTPS protocol for network streams.
400 </para>
401
402 <para>
403 <command>gcc tools/qt-faststart.c -o tools/qt-faststart</command>: This
404 builds the <command>qt-faststart</command> program which can modify
405 QuickTime formatted movies (<filename class="extension">.mov</filename>
406 or <filename class="extension">.mp4</filename>) so that the header
407 information is located at the beginning of the file instead of the end.
408 This allows the movie file to begin playing before the entire file has
409 been downloaded.
410 </para>
411
412 <note>
413 <para>
414 Support for most of the dependency packages requires using options
415 passed to the <command>configure</command> script. View the output
416 from <command>./configure --help</command> for complete information
417 about enabling dependency packages.
418 </para>
419 </note>
420
421 </sect2>
422
423 <sect2 role="configuration">
424 <title>Configuring FFmpeg</title>
425
426 <sect3 id="ffmpeg-config">
427 <title>Config Files</title>
428
429 <para>
430 <filename>/etc/ffserver.conf</filename> and
431 <filename>~/.ffmpeg/ffserver-config</filename>
432 </para>
433
434 <indexterm zone="ffmpeg ffmpeg-config">
435 <primary
436 sortas="e-AA.ffmpeg-ffserver-config">~/.ffmpeg/ffserver-config</primary>
437 </indexterm>
438
439 <indexterm zone="ffmpeg ffmpeg-config">
440 <primary sortas="e-etc-ffserver.conf">/etc/ffserver.conf</primary>
441 </indexterm>
442
443 <para>
444 You'll find a sample <command>ffserver</command> configuration file at
445 <filename>doc/ffserver.conf</filename> in the source tree.
446 </para>
447
448 </sect3>
449
450 </sect2>
451
452 <sect2 role="content">
453 <title>Contents</title>
454
455 <segmentedlist>
456 <segtitle>Installed Programs</segtitle>
457 <segtitle>Installed Libraries</segtitle>
458 <segtitle>Installed Directories</segtitle>
459
460 <seglistitem>
461 <seg>
462 ffmpeg, ffplay, ffprobe, ffserver, and
463 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/{libavcodec,libavdevice,libavfilter,libavformat},
472 /usr/include/{libavutil,libpostproc,libswresample,libswscale},
473 /usr/share/doc/ffmpeg-&ffmpeg-version;, and
474 /usr/share/ffmpeg
475 </seg>
476 </seglistitem>
477 </segmentedlist>
478
479 <variablelist>
480 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
481 <?dbfo list-presentation="list"?>
482 <?dbhtml list-presentation="table"?>
483
484 <varlistentry id="ffmpeg-prog">
485 <term><command>ffmpeg</command></term>
486 <listitem>
487 <para>
488 is a command-line tool to convert video files, network streams and
489 input from a TV card to several video formats.
490 </para>
491 <indexterm zone="ffmpeg ffmpeg-prog">
492 <primary sortas="b-ffmpeg">ffmpeg</primary>
493 </indexterm>
494 </listitem>
495 </varlistentry>
496
497 <varlistentry id="ffplay">
498 <term><command>ffplay</command></term>
499 <listitem>
500 <para>
501 is a very simple and portable media player using the
502 <filename>ffmpeg</filename> libraries and the SDL library.
503 </para>
504 <indexterm zone="ffmpeg ffplay">
505 <primary sortas="b-ffplay">ffplay</primary>
506 </indexterm>
507 </listitem>
508 </varlistentry>
509
510 <varlistentry id="ffprobe">
511 <term><command>ffprobe</command></term>
512 <listitem>
513 <para>
514 gathers information from multimedia streams and prints it in a human
515 and machine-readable fashion.
516 </para>
517 <indexterm zone="ffmpeg ffprobe">
518 <primary sortas="b-ffprobe">ffprobe</primary>
519 </indexterm>
520 </listitem>
521 </varlistentry>
522
523 <varlistentry id="ffserver">
524 <term><command>ffserver</command></term>
525 <listitem>
526 <para>
527 is a streaming server for everything that <command>ffmpeg</command>
528 could use as input (files, streams, TV card input, webcam, etc).
529 </para>
530 <indexterm zone="ffmpeg ffserver">
531 <primary sortas="b-ffserver">ffserver</primary>
532 </indexterm>
533 </listitem>
534 </varlistentry>
535
536 <varlistentry id="qt-faststart">
537 <term><command>qt-faststart</command></term>
538 <listitem>
539 <para>
540 moves the index file to the front of quicktime (mov/mp4) videos.
541 </para>
542 <indexterm zone="ffmpeg qt-faststart">
543 <primary sortas="b-qt-faststart">qt-faststart</primary>
544 </indexterm>
545 </listitem>
546 </varlistentry>
547
548 <varlistentry id="libavcodec">
549 <term><filename class="libraryfile">libavcodec.so</filename></term>
550 <listitem>
551 <para>
552 is a library containing the <application>FFmpeg</application> codecs
553 (both encoding and decoding).
554 </para>
555 <indexterm zone="ffmpeg libavcodec">
556 <primary sortas="c-libavcodec">libavcodec.so</primary>
557 </indexterm>
558 </listitem>
559 </varlistentry>
560
561 <varlistentry id="libavdevice">
562 <term><filename class="libraryfile">libavdevice.so</filename></term>
563 <listitem>
564 <para>
565 is the <application>FFmpeg</application> device handling library.
566 </para>
567 <indexterm zone="ffmpeg libavdevice">
568 <primary sortas="c-libavdevice">libavdevice.so</primary>
569 </indexterm>
570 </listitem>
571 </varlistentry>
572
573 <varlistentry id="libavfilter">
574 <term><filename class="libraryfile">libavfilter.so</filename></term>
575 <listitem>
576 <para>
577 is a library of filters that can alter video or audio between the
578 decoder and the encoder (or output).
579 </para>
580 <indexterm zone="ffmpeg libavfilter">
581 <primary sortas="c-libavfilter">libavfilter.so</primary>
582 </indexterm>
583 </listitem>
584 </varlistentry>
585
586 <varlistentry id="libavformat">
587 <term><filename class="libraryfile">libavformat.so</filename></term>
588 <listitem>
589 <para>
590 is a library containing the file formats handling (mux and demux
591 code for several formats) used by <command>ffplay</command> as well
592 as allowing the generation of audio or video streams.
593 </para>
594 <indexterm zone="ffmpeg libavformat">
595 <primary sortas="c-libavformat">libavformat.so</primary>
596 </indexterm>
597 </listitem>
598 </varlistentry>
599
600 <varlistentry id="libavutil">
601 <term><filename class="libraryfile">libavutil.so</filename></term>
602 <listitem>
603 <para>
604 is the <application>FFmpeg</application> utility library.
605 </para>
606 <indexterm zone="ffmpeg libavutil">
607 <primary sortas="c-libavutil">libavutil.so</primary>
608 </indexterm>
609 </listitem>
610 </varlistentry>
611
612 <varlistentry id="libpostproc">
613 <term><filename class="libraryfile">libpostproc.so</filename></term>
614 <listitem>
615 <para>
616 is the <application>FFmpeg</application> post processing library.
617 </para>
618 <indexterm zone="ffmpeg libpostproc">
619 <primary sortas="c-libpostproc">libpostproc.so</primary>
620 </indexterm>
621 </listitem>
622 </varlistentry>
623
624 <varlistentry id="libswresample">
625 <term><filename class="libraryfile">libswresample.so</filename></term>
626 <listitem>
627 <para>
628 is the <application>FFmpeg</application> audio rescaling library,
629 it contains functions for converting audio sample formats.
630 </para>
631 <indexterm zone="ffmpeg libswresample">
632 <primary sortas="c-libswresample">libswresample.so</primary>
633 </indexterm>
634 </listitem>
635 </varlistentry>
636
637 <varlistentry id="libswscale">
638 <term><filename class="libraryfile">libswscale.so</filename></term>
639 <listitem>
640 <para>
641 is the <application>FFmpeg</application> image rescaling library.
642 </para>
643 <indexterm zone="ffmpeg libswscale">
644 <primary sortas="c-libswscale">libswscale.so</primary>
645 </indexterm>
646 </listitem>
647 </varlistentry>
648
649 </variablelist>
650
651 </sect2>
652
653</sect1>
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