source: multimedia/videoutils/ffmpeg.xml@ f3429309

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Last change on this file since f3429309 was f3429309, checked in by Fernando de Oliveira <fernando@…>, 7 years ago
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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 "5af71aec0c8f99a018b02061acbe7f90">
10 <!ENTITY ffmpeg-size "6.9 MB">
11 <!ENTITY ffmpeg-buildsize "127 MB (additional 2.4 GB to run the FATE suite)">
12 <!ENTITY ffmpeg-time "4.7 SBU (additional 5.8 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"/>,
93 <xref linkend="x265"/>, and
94 <xref linkend="yasm"/>
95 </para>
96
97 <bridgehead renderas="sect4">Recommended for desktop use</bridgehead>
98 <para>
99 <xref linkend="alsa-lib"/>,
100 <xref linkend="libva"/>,
101 <xref linkend="libvdpau"/> (with the corresponding driver package), and
102 <xref linkend="sdl"/>
103 </para>
104
105 <bridgehead renderas="sect4">Optional</bridgehead>
106 <para role="optional">
107 <xref linkend="faac"/>,
108 <xref linkend="fontconfig"/>,
109 <xref linkend="frei0r"/>,
110 <xref linkend="libcdio"/> (to identify and play CDs),
111 <xref linkend="libwebp"/>,
112 <xref linkend="opencv"/>,
113 <xref linkend="openjpeg"/>,
114 <xref linkend="openssl"/> or
115 <xref linkend="gnutls"/>,
116 <xref linkend="pulseaudio"/>,
117 <xref linkend="speex"/>,
118 <xref linkend="texlive"/>
119 (or <xref linkend="tl-installer"/>) for PDF and PS documentation,
120 <xref linkend="v4l-utils"/>,
121 <xref linkend="xvid"/>,
122 <xref linkend="x-window-system"/>,
123 <ulink url="http://www.speech.cs.cmu.edu/flite/">Flite</ulink>,
124 <ulink url="http://www.quut.com/gsm/">GSM</ulink>,
125 <ulink url="http://xhevc.com/en/hevc/decoder/download.jsp">HEVC/H.265</ulink>,
126 <ulink url="http://www.ladspa.org/">LADSPA</ulink>,
127 <ulink url="http://tipok.org.ua/node/17">libaacplus</ulink>,
128 <ulink url="http://www.videolan.org/developers/libbluray.html">libbluray</ulink>,
129 <ulink url="http://caca.zoy.org/">libcaca</ulink>,
130 <ulink url="http://www.celt-codec.org/">libcelt</ulink>,
131 <ulink url="http://sourceforge.net/projects/libdc1394">libdc1394</ulink>,
132 <ulink url="https://www.videolan.org/developers/libdca.html">libdca</ulink>,
133 <ulink url="https://ieee1394.wiki.kernel.org/index.php/Libraries">libiec61883</ulink>,
134 <ulink url="https://github.com/dekkers/libilbc">libilbc</ulink>,
135 <ulink url="http://sourceforge.net/projects/modplug-xmms/">libmodplug</ulink>,
136 <ulink url="https://github.com/Distrotech/libnut">libnut</ulink> (Git checkout),
137 <ulink url="http://rtmpdump.mplayerhq.hu/">librtmp</ulink>,
138 <ulink url="http://www.libssh.org/">libssh</ulink>,
139 <ulink url="http://xavs.sourceforge.net/">libxavs</ulink> (SVN checkout),
140 <ulink url="http://kcat.strangesoft.net/openal-releases/">OpenAL</ulink>,
141 <ulink url="http://sourceforge.net/projects/opencore-amr">OpenCore AMR</ulink>,
142 <ulink url="http://diracvideo.org/">Schroedinger</ulink>,
143 <ulink url="http://www.twolame.org/">TwoLAME</ulink>,
144 <ulink url="http://sourceforge.net/projects/opencore-amr/files/vo-aacenc/">vo-aaenc</ulink>,
145 <ulink url="http://sourceforge.net/projects/opencore-amr/files/vo-amrwbenc/">vo-amrwbenc</ulink>,
146 <ulink url="http://www.videolan.org/developers/x265.html">x265 (H.265/MPEG-H HEVC)</ulink>, and
147 <ulink url="http://zapping.sourceforge.net/ZVBI/">ZVBI</ulink>
148 </para>
149
150 <para condition="html" role="usernotes">
151 User Notes: <ulink url="&blfs-wiki;/ffmpeg"/>
152 </para>
153 </sect2>
154
155 <sect2 role="installation">
156 <title>Installation of FFmpeg</title>
157
158 <para>
159 Install <application>FFmpeg</application> by running the following
160 commands:
161 </para>
162
163<screen><userinput>sed -i 's/-lflite"/-lflite -lasound"/' configure &amp;&amp;
164
165./configure --prefix=/usr \
166 --enable-gpl \
167 --enable-version3 \
168 --enable-nonfree \
169 --disable-static \
170 --enable-shared \
171 --disable-debug \
172 --enable-libass \
173 --enable-libfdk-aac \
174 --enable-libfreetype \
175 --enable-libmp3lame \
176 --enable-libopus \
177 --enable-libtheora \
178 --enable-libvorbis \
179 --enable-libvpx \
180 --enable-libx264 \
181 --enable-libx265 \
182 --enable-x11grab \
183 --docdir=/usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
184
185make &amp;&amp;
186
187gcc tools/qt-faststart.c -o tools/qt-faststart</userinput></screen>
188
189 <para>
190 HTML documentation was built in the previous step. If you have
191 <xref linkend="texlive"/> installed and wish to build PDF and
192 Postscript versions of the documentation, issue the following commands:
193 </para>
194
195<screen><userinput>sed -i '$s/$/\n\n@bye/' doc/{git-howto,nut,fate}.texi &amp;&amp;
196sed -i '/machine:i386/ s/\\/@backslashchar{}/g' doc/platform.texi &amp;&amp;
197
198pushd doc &amp;&amp;
199for DOCNAME in `basename -s .html *.html`
200do
201 texi2pdf -b $DOCNAME.texi &amp;&amp;
202 texi2dvi -b $DOCNAME.texi &amp;&amp;
203
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;
227
228install -v -m755 tools/qt-faststart /usr/bin &amp;&amp;
229install -v -m644 doc/*.txt \
230 /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 \
239 /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
240install -v -m644 doc/*.ps \
241 /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
242
243 <para>
244 If you used <command>doxygen</command> to create the API documentation,
245 install it (another 300 MB of space) by issuing the following commands
246 as the <systemitem class="username">root</systemitem> user:
247 </para>
248
249<screen role="root"><userinput>install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
250cp -vr doc/doxy/html/* /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
251find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type f -exec chmod -c 0644 \{} \; &amp;&amp;
252find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type d -exec chmod -c 0755 \{} \;</userinput></screen>
253
254 <para>
255 To properly test the installation you must have <xref linkend="rsync"/>
256 installed and follow the instructions for the <ulink
257 url="http://www.ffmpeg.org/fate.html"> FFmpeg Automated Testing
258 Environment</ulink> (FATE). First, about 930 MB of sample files used to
259 run FATE are downloaded with the command:
260 </para>
261
262<screen><userinput>make fate-rsync SAMPLES=fate-suite/</userinput></screen>
263
264 <para>
265 The <filename class="directory">fate-suite</filename> directory is
266 created and the files are downloaded there. That command actually runs an
267 rsync command, to obtain the sample files. You may want to compress and
268 keep this directory for testing again, in another system, or when a new
269 version of ffmpeg is launched. Then, you unpack the sample files in the
270 source directory, and run, again, the <command>make fate-rsync
271 ...</command> command above, to sync with the repository. Now, the
272 download size and time are drastically reduced. Estimated values in
273 "Package Information" do not include the download SBU. Some samples may
274 have been removed, in the new version, so, in order to be sure local and
275 server fate samples are identical, when you use previously saved samples,
276 run the following command:
277 </para>
278
279<screen><userinput><command>rsync -vrltLW --delete --timeout=60 --contimeout=60 \
280 rsync://fate-suite.ffmpeg.org/fate-suite/ fate-suite/</command></userinput></screen>
281
282 <para>
283 Next, FATE is executed, with the commands (you obtain a number of tests
284 larger than 2400):
285 </para>
286
287<screen><userinput>make fate THREADS=<replaceable>N</replaceable> SAMPLES=fate-suite/ | tee ../fate.log &amp;&amp;
288grep ^TEST ../fate.log | wc -l</userinput></screen>
289
290 <para>
291 where <replaceable>N</replaceable> is an integer,
292 <replaceable>N</replaceable> &le; number of threads in the system.
293 </para>
294
295 </sect2>
296
297 <sect2 role="commands">
298 <title>Command Explanations</title>
299
300 <para>
301 <command>sed -i ... configure</command>: This command adds the
302 <application>ALSA</application> library to the
303 <application>Flite</application> <envar>LDFLAGS</envar> variable and
304 enables the discovery of <application>Flite</application>.
305 </para>
306
307 <para>
308 <command>sed -i ... texi</command>: Fix some .texi files for
309 documentation builds.
310 </para>
311
312 <para>
313 <command>find ... ;</command>: Fix permissions of documentation files
314 and directories.
315 </para>
316
317 <para>
318 <option>--enable-libfreetype</option>: Enables
319 <application>Freetype</application> support.
320 </para>
321
322 <para>
323 <parameter>--enable-gpl</parameter>: Enables the use of GPL code and
324 permits support for postprocessing, swscale and many other features.
325 </para>
326
327 <para>
328 <parameter>--enable-version3</parameter>: Enables the use of (L)GPL
329 version 3 code.
330 </para>
331
332 <para>
333 <parameter>--enable-nonfree</parameter>: Enables the use of nonfree code.
334 Note that the resulting libraries and binaries will be unredistributable.
335 </para>
336
337 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
338 href="../../xincludes/static-libraries.xml"/>
339
340 <para>
341 <parameter>--enable-shared</parameter>: Enables building shared
342 libraries, otherwise only static libraries are built and installed.
343 </para>
344
345 <para>
346 <parameter>--disable-debug</parameter>: Disables building debugging
347 symbols into the programs and libraries.
348 </para>
349
350 <para>
351 <parameter>--enable-libass</parameter>: Enables ASS/SSA subtitle format
352 rendering via <filename class="libraryfile">libass</filename>.
353 </para>
354
355 <para>
356 <parameter>--enable-libfdk-aac</parameter>: Enables currently the
357 highest-quality AAC audio encoding via <filename
358 class="libraryfile">libfdk-aac</filename>.
359 </para>
360
361 <para>
362 <parameter>--enable-libmp3lame</parameter>: Enables MP3 audio encoding
363 via <filename class="libraryfile">libmp3lame</filename>.
364 </para>
365
366 <para>
367 <parameter>--enable-libvorbis --enable-libtheora</parameter>: Enables
368 Theora video encoding via <filename
369 class="libraryfile">libvorbis</filename> and <filename
370 class="libraryfile">libtheora</filename>.
371 </para>
372
373 <para>
374 <parameter>--enable-libvorbis --enable-libvpx</parameter>: Enables WebM
375 encoding via <filename class="libraryfile">libvorbis</filename> and
376 <filename class="libraryfile">libvpx</filename>.
377 </para>
378
379 <para>
380 <parameter>--enable-libx264</parameter>: Enables high-quality
381 H.264/MPEG-4 AVC encoding via <filename
382 class="libraryfile">libx264</filename>.
383 </para>
384
385 <para>
386 <parameter>--enable-libx265</parameter>: Enables high-quality
387 H.265/HEVC encoding via <filename
388 class="libraryfile">libx265</filename>.
389 </para>
390
391 <para>
392 <parameter>--enable-x11grab</parameter>: Enables X11 grabbing.
393 </para>
394
395 <para>
396 <option>--enable-openssl</option> or <option>--enable-gnutls</option>:
397 Enables HTTPS protocol for network streams.
398 </para>
399
400 <para>
401 <command>gcc tools/qt-faststart.c -o tools/qt-faststart</command>: This
402 builds the <command>qt-faststart</command> program which can modify
403 QuickTime formatted movies (<filename class="extension">.mov</filename>
404 or <filename class="extension">.mp4</filename>) so that the header
405 information is located at the beginning of the file instead of the end.
406 This allows the movie file to begin playing before the entire file has
407 been downloaded.
408 </para>
409
410 <note>
411 <para>
412 Support for most of the dependency packages requires using options
413 passed to the <command>configure</command> script. View the output
414 from <command>./configure --help</command> for complete information
415 about enabling dependency packages.
416 </para>
417 </note>
418
419 </sect2>
420
421 <sect2 role="configuration">
422 <title>Configuring FFmpeg</title>
423
424 <sect3 id="ffmpeg-config">
425 <title>Config Files</title>
426
427 <para>
428 <filename>/etc/ffserver.conf</filename> and
429 <filename>~/.ffmpeg/ffserver-config</filename>
430 </para>
431
432 <indexterm zone="ffmpeg ffmpeg-config">
433 <primary
434 sortas="e-AA.ffmpeg-ffserver-config">~/.ffmpeg/ffserver-config</primary>
435 </indexterm>
436
437 <indexterm zone="ffmpeg ffmpeg-config">
438 <primary sortas="e-etc-ffserver.conf">/etc/ffserver.conf</primary>
439 </indexterm>
440
441 <para>
442 You'll find a sample <command>ffserver</command> configuration file at
443 <filename>doc/ffserver.conf</filename> in the source tree.
444 </para>
445
446 </sect3>
447
448 </sect2>
449
450 <sect2 role="content">
451 <title>Contents</title>
452
453 <segmentedlist>
454 <segtitle>Installed Programs</segtitle>
455 <segtitle>Installed Libraries</segtitle>
456 <segtitle>Installed Directories</segtitle>
457
458 <seglistitem>
459 <seg>
460 ffmpeg, ffplay, ffprobe, ffserver, and
461 qt-faststart
462 </seg>
463 <seg>
464 libavcodec.so, libavdevice.so, libavfilter.so,
465 libavformat.so, libavutil.so, libpostproc.so,
466 libswresample, and libswscale.so
467 </seg>
468 <seg>
469 /usr/include/{libavcodec,libavdevice,libavfilter,libavformat},
470 /usr/include/{libavutil,libpostproc,libswresample,libswscale},
471 /usr/share/doc/ffmpeg-&ffmpeg-version;, and
472 /usr/share/ffmpeg
473 </seg>
474 </seglistitem>
475 </segmentedlist>
476
477 <variablelist>
478 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
479 <?dbfo list-presentation="list"?>
480 <?dbhtml list-presentation="table"?>
481
482 <varlistentry id="ffmpeg-prog">
483 <term><command>ffmpeg</command></term>
484 <listitem>
485 <para>
486 is a command-line tool to convert video files, network streams and
487 input from a TV card to several video formats.
488 </para>
489 <indexterm zone="ffmpeg ffmpeg-prog">
490 <primary sortas="b-ffmpeg">ffmpeg</primary>
491 </indexterm>
492 </listitem>
493 </varlistentry>
494
495 <varlistentry id="ffplay">
496 <term><command>ffplay</command></term>
497 <listitem>
498 <para>
499 is a very simple and portable media player using the
500 <filename>ffmpeg</filename> libraries and the SDL library.
501 </para>
502 <indexterm zone="ffmpeg ffplay">
503 <primary sortas="b-ffplay">ffplay</primary>
504 </indexterm>
505 </listitem>
506 </varlistentry>
507
508 <varlistentry id="ffprobe">
509 <term><command>ffprobe</command></term>
510 <listitem>
511 <para>
512 gathers information from multimedia streams and prints it in a human
513 and machine-readable fashion.
514 </para>
515 <indexterm zone="ffmpeg ffprobe">
516 <primary sortas="b-ffprobe">ffprobe</primary>
517 </indexterm>
518 </listitem>
519 </varlistentry>
520
521 <varlistentry id="ffserver">
522 <term><command>ffserver</command></term>
523 <listitem>
524 <para>
525 is a streaming server for everything that <command>ffmpeg</command>
526 could use as input (files, streams, TV card input, webcam, etc).
527 </para>
528 <indexterm zone="ffmpeg ffserver">
529 <primary sortas="b-ffserver">ffserver</primary>
530 </indexterm>
531 </listitem>
532 </varlistentry>
533
534 <varlistentry id="qt-faststart">
535 <term><command>qt-faststart</command></term>
536 <listitem>
537 <para>
538 moves the index file to the front of quicktime (mov/mp4) videos.
539 </para>
540 <indexterm zone="ffmpeg qt-faststart">
541 <primary sortas="b-qt-faststart">qt-faststart</primary>
542 </indexterm>
543 </listitem>
544 </varlistentry>
545
546 <varlistentry id="libavcodec">
547 <term><filename class="libraryfile">libavcodec.so</filename></term>
548 <listitem>
549 <para>
550 is a library containing the <application>FFmpeg</application> codecs
551 (both encoding and decoding).
552 </para>
553 <indexterm zone="ffmpeg libavcodec">
554 <primary sortas="c-libavcodec">libavcodec.so</primary>
555 </indexterm>
556 </listitem>
557 </varlistentry>
558
559 <varlistentry id="libavdevice">
560 <term><filename class="libraryfile">libavdevice.so</filename></term>
561 <listitem>
562 <para>
563 is the <application>FFmpeg</application> device handling library.
564 </para>
565 <indexterm zone="ffmpeg libavdevice">
566 <primary sortas="c-libavdevice">libavdevice.so</primary>
567 </indexterm>
568 </listitem>
569 </varlistentry>
570
571 <varlistentry id="libavfilter">
572 <term><filename class="libraryfile">libavfilter.so</filename></term>
573 <listitem>
574 <para>
575 is a library of filters that can alter video or audio between the
576 decoder and the encoder (or output).
577 </para>
578 <indexterm zone="ffmpeg libavfilter">
579 <primary sortas="c-libavfilter">libavfilter.so</primary>
580 </indexterm>
581 </listitem>
582 </varlistentry>
583
584 <varlistentry id="libavformat">
585 <term><filename class="libraryfile">libavformat.so</filename></term>
586 <listitem>
587 <para>
588 is a library containing the file formats handling (mux and demux
589 code for several formats) used by <command>ffplay</command> as well
590 as allowing the generation of audio or video streams.
591 </para>
592 <indexterm zone="ffmpeg libavformat">
593 <primary sortas="c-libavformat">libavformat.so</primary>
594 </indexterm>
595 </listitem>
596 </varlistentry>
597
598 <varlistentry id="libavutil">
599 <term><filename class="libraryfile">libavutil.so</filename></term>
600 <listitem>
601 <para>
602 is the <application>FFmpeg</application> utility library.
603 </para>
604 <indexterm zone="ffmpeg libavutil">
605 <primary sortas="c-libavutil">libavutil.so</primary>
606 </indexterm>
607 </listitem>
608 </varlistentry>
609
610 <varlistentry id="libpostproc">
611 <term><filename class="libraryfile">libpostproc.so</filename></term>
612 <listitem>
613 <para>
614 is the <application>FFmpeg</application> post processing library.
615 </para>
616 <indexterm zone="ffmpeg libpostproc">
617 <primary sortas="c-libpostproc">libpostproc.so</primary>
618 </indexterm>
619 </listitem>
620 </varlistentry>
621
622 <varlistentry id="libswresample">
623 <term><filename class="libraryfile">libswresample.so</filename></term>
624 <listitem>
625 <para>
626 is the <application>FFmpeg</application> audio rescaling library,
627 it contains functions for converting audio sample formats.
628 </para>
629 <indexterm zone="ffmpeg libswresample">
630 <primary sortas="c-libswresample">libswresample.so</primary>
631 </indexterm>
632 </listitem>
633 </varlistentry>
634
635 <varlistentry id="libswscale">
636 <term><filename class="libraryfile">libswscale.so</filename></term>
637 <listitem>
638 <para>
639 is the <application>FFmpeg</application> image rescaling library.
640 </para>
641 <indexterm zone="ffmpeg libswscale">
642 <primary sortas="c-libswscale">libswscale.so</primary>
643 </indexterm>
644 </listitem>
645 </varlistentry>
646
647 </variablelist>
648
649 </sect2>
650
651</sect1>
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