source: multimedia/videoutils/ffmpeg.xml

trunk
Last change on this file was 545a53d, checked in by Douglas R. Reno <renodr@…>, 5 days ago

ffmpeg: Add an optional dependency on libjxl.

This enables jpegxl support in the ffmpeg parser

  • Property mode set to 100644
File size: 24.4 KB
Line 
1<?xml version="1.0" encoding="UTF-8"?>
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 "https://ffmpeg.org/releases/ffmpeg-&ffmpeg-version;.tar.xz">
8 <!ENTITY ffmpeg-download-ftp " ">
9 <!ENTITY ffmpeg-md5sum "341d719415b7f95bb59f5016f2864ac6">
10 <!ENTITY ffmpeg-size "10 MB">
11 <!ENTITY ffmpeg-buildsize "237 MB (add 1.5 GB for the FATE suite/tests, add 792 MB for documentation)">
12 <!ENTITY ffmpeg-time "1.3 SBU (using parallelism=4; add 3.2 SBU (with THREADS=4) to run the FATE suite after sample files are downloaded; add 0.3 SBU for doxygen docs)">
13]>
14
15<sect1 id="ffmpeg" xreflabel="FFmpeg-&ffmpeg-version;">
16 <?dbhtml filename="ffmpeg.html"?>
17
18
19 <title>FFmpeg-&ffmpeg-version;</title>
20
21 <indexterm zone="ffmpeg">
22 <primary sortas="a-FFmpeg">FFmpeg</primary>
23 </indexterm>
24
25 <sect2 role="package">
26 <title>Introduction to FFmpeg</title>
27
28 <para>
29 <application>FFmpeg</application> is a solution to record, convert and
30 stream audio and video. It is a very fast video and audio converter and it
31 can also acquire from a live audio/video source. Designed to be intuitive,
32 the command-line interface (<command>ffmpeg</command>) tries to figure out
33 all the parameters, when possible. <application>FFmpeg</application> can
34 also convert from any sample rate to any other, and resize video on the
35 fly with a high quality polyphase filter.
36 <application>FFmpeg</application> can use a Video4Linux compatible video
37 source and any Open Sound System audio source.
38 </para>
39
40 &lfs121_checked;
41
42 <bridgehead renderas="sect3">Package Information</bridgehead>
43 <itemizedlist spacing="compact">
44 <listitem>
45 <para>
46 Download (HTTP): <ulink url="&ffmpeg-download-http;"/>
47 </para>
48 </listitem>
49 <listitem>
50 <para>
51 Download (FTP): <ulink url="&ffmpeg-download-ftp;"/>
52 </para>
53 </listitem>
54 <listitem>
55 <para>
56 Download MD5 sum: &ffmpeg-md5sum;
57 </para>
58 </listitem>
59 <listitem>
60 <para>
61 Download size: &ffmpeg-size;
62 </para>
63 </listitem>
64 <listitem>
65 <para>
66 Estimated disk space required: &ffmpeg-buildsize;
67 </para>
68 </listitem>
69 <listitem>
70 <para>
71 Estimated build time: &ffmpeg-time;
72 </para>
73 </listitem>
74 </itemizedlist>
75
76 <bridgehead renderas="sect3">Additional Downloads</bridgehead>
77 <itemizedlist spacing="compact">
78 <listitem>
79 <para>
80 Required patch:
81 <ulink url="&patch-root;/ffmpeg-&ffmpeg-version;-chromium_method-1.patch"/>
82 </para>
83 </listitem>
84 <listitem>
85 <para>
86 Required patch:
87 <ulink url="&patch-root;/ffmpeg-&ffmpeg-version;-vulkan_fixes-1.patch"/>
88 </para>
89 </listitem>
90 </itemizedlist>
91
92 <bridgehead renderas="sect3">FFmpeg Dependencies</bridgehead>
93
94 <bridgehead renderas="sect4">Recommended</bridgehead>
95 <para role="recommended">
96 <xref linkend="libaom"/>,
97 <xref linkend="libass"/>,
98 <xref linkend="fdk-aac"/>,
99 <xref linkend="freetype2"/>,
100 <xref linkend="lame"/>,
101 <xref linkend="libvorbis"/>,
102 <xref linkend="libvpx"/>,
103 <xref linkend="opus"/>,
104 <xref linkend="x264"/>,
105 <xref linkend="x265"/>, and
106 <xref linkend="nasm"/> or <xref linkend="yasm"/>
107 </para>
108
109 <bridgehead renderas="sect4">Recommended for desktop use</bridgehead>
110 <para role="recommended">
111 <xref linkend="alsa-lib"/>,
112 <xref linkend="libva"/>,
113 <xref linkend="libvdpau"/> (with the corresponding driver package), and
114 <xref linkend="sdl2"/>
115 </para>
116
117 <bridgehead renderas="sect4">Optional</bridgehead>
118 <para role="optional">
119 <xref linkend="doxygen"/>,
120 <xref linkend="fontconfig"/>,
121 <xref linkend="fribidi"/>,
122 <xref linkend="frei0r"/>,
123 <xref linkend="libcdio"/> (to identify and play CDs),
124 <xref linkend="libdrm"/> (for <quote>kmsgrab</quote> input),
125 <!--<xref linkend="libtheora"/>,-->
126 <xref linkend="libjxl"/>,
127 <xref linkend="libwebp"/>,
128 <xref linkend="opencv"/>,
129 <xref linkend="openjpeg2"/>,
130 <xref linkend="gnutls"/>,
131 <xref linkend="pulseaudio"/>,
132 <xref linkend="samba"/>,
133 <xref linkend="speex"/>,
134 <xref linkend="texlive"/>
135 (or <xref linkend="tl-installer"/>) for PDF and PS documentation,
136 <xref linkend="v4l-utils"/>,
137 <xref linkend="vulkan-loader"/>,
138 <xref linkend="xvid"/>,
139 <xref linkend="x-window-system"/>,
140 <ulink url="https://code.videolan.org/videolan/dav1d">dav1d</ulink>,
141 <ulink url="https://github.com/festvox/flite">Flite</ulink>,
142 <ulink url="https://www.quut.com/gsm/">GSM</ulink>,
143 <ulink url="https://tipok.org.ua/node/17">libaacplus</ulink>,
144 <ulink url="https://www.videolan.org/developers/libbluray.html">libbluray</ulink>,
145 <ulink url="https://github.com/cacalabs/libcaca">libcaca</ulink>,
146 <ulink url="https://gitlab.xiph.org/xiph/celt">libcelt</ulink>,
147 <ulink url="https://sourceforge.net/projects/libdc1394">libdc1394</ulink>,
148 <ulink url="https://www.videolan.org/developers/libdca.html">libdca</ulink>,
149 <ulink url="https://ieee1394.wiki.kernel.org/index.php/Libraries">libiec61883</ulink>,
150 <ulink url="https://github.com/dekkers/libilbc">libilbc</ulink>,
151 <ulink url="https://sourceforge.net/projects/modplug-xmms/">libmodplug</ulink>,
152 <ulink url="https://github.com/Distrotech/libnut">libnut</ulink> (Git checkout),
153 <ulink url="https://rtmpdump.mplayerhq.hu/">librtmp</ulink>,
154 <ulink url="https://www.libssh.org/">libssh</ulink>,
155 <ulink url="https://www.theora.org">libtheora</ulink>,
156 <ulink url="https://openal.org/">OpenAL</ulink>,
157 <ulink url="https://sourceforge.net/projects/opencore-amr">OpenCore AMR</ulink>,
158 <ulink url="https://github.com/Haivision/srt">Srt</ulink>,
159 <ulink url="https://sourceforge.net/projects/schrodinger/">Schroedinger</ulink>,
160 <ulink url="https://www.twolame.org/">TwoLAME</ulink>,
161 <ulink url="https://sourceforge.net/projects/opencore-amr/files/vo-aacenc/">vo-aaenc</ulink>,
162 <ulink url="https://sourceforge.net/projects/opencore-amr/files/vo-amrwbenc/">vo-amrwbenc</ulink>, and
163 <!--<ulink url="https://vulkan.org/">Vulkan</ulink>, and-->
164 <ulink url="https://zapping.sourceforge.net/ZVBI/">ZVBI</ulink>
165 </para>
166
167 </sect2>
168
169 <sect2 role="installation">
170 <title>Installation of FFmpeg</title>
171
172 <para>
173 First, apply a patch that adds an API necessary for some packages to
174 build:
175 <!-- qtwebengine -->
176 </para>
177
178<screen><userinput remap="pre">patch -Np1 -i ../ffmpeg-&ffmpeg-version;-chromium_method-1.patch</userinput></screen>
179
180 <para>
181 Next, apply a patch that fixes building with the latest version of the
182 Vulkan API:
183 <!-- Ticket #19390 -->
184 </para>
185
186<screen><userinput remap="pre">patch -Np1 -i ../ffmpeg-&ffmpeg-version;-vulkan_fixes-1.patch</userinput></screen>
187
188 <para>
189 Install <application>FFmpeg</application> by running the following
190 commands:
191 </para>
192
193<screen><userinput>./configure --prefix=/usr \
194 --enable-gpl \
195 --enable-version3 \
196 --enable-nonfree \
197 --disable-static \
198 --enable-shared \
199 --disable-debug \
200 --enable-libaom \
201 --enable-libass \
202 --enable-libfdk-aac \
203 --enable-libfreetype \
204 --enable-libmp3lame \
205 --enable-libopus \
206 --enable-libvorbis \
207 --enable-libvpx \
208 --enable-libx264 \
209 --enable-libx265 \
210 --enable-openssl \
211 --ignore-tests=enhanced-flv-av1 \
212 --docdir=/usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
213
214make &amp;&amp;
215
216gcc tools/qt-faststart.c -o tools/qt-faststart</userinput></screen>
217
218 <para>
219 HTML documentation was built in the previous step. If you have
220 <xref linkend="texlive"/> installed and wish to build PDF and
221 Postscript versions of the documentation, issue the following commands:
222 </para>
223
224<screen remap="doc"><userinput>pushd doc &amp;&amp;
225for DOCNAME in `basename -s .html *.html`
226do
227 texi2pdf -b $DOCNAME.texi &amp;&amp;
228 texi2dvi -b $DOCNAME.texi &amp;&amp;
229
230 dvips -o $DOCNAME.ps \
231 $DOCNAME.dvi
232done &amp;&amp;
233popd &amp;&amp;
234unset DOCNAME</userinput></screen>
235
236 <para>
237 If you have <xref linkend="doxygen"/> installed
238 and you wish to build (if --disable-doc was
239 used) or rebuild the html documentation, issue:
240 </para>
241
242<screen remap="doc"><userinput>doxygen doc/Doxyfile</userinput></screen>
243
244 <para>
245 The fate-suite tests include comparisons with installed files, and should
246 not be run before the package is installed. Therefore, if you desire to
247 run them, instructions are given further below.
248 </para>
249
250 <para>
251 Now, as the <systemitem class="username">root</systemitem> user:
252 </para>
253
254<screen role="root"><userinput>make install &amp;&amp;
255
256install -v -m755 tools/qt-faststart /usr/bin &amp;&amp;
257install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
258install -v -m644 doc/*.txt /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
259
260 <para>
261 If the PDF and Postscript documentation was built, issue the following
262 commands, as the <systemitem class="username">root</systemitem> user, to
263 install them:
264 </para>
265
266<screen role="root"
267 remap="doc"><userinput>install -v -m644 doc/*.pdf /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
268install -v -m644 doc/*.ps /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
269
270 <para>
271 If you used <command>doxygen</command> to manually create the API
272 documentation, install it by issuing the following commands
273 as the <systemitem class="username">root</systemitem> user:
274 </para>
275
276<screen role="root"
277 remap="doc"><userinput>install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
278cp -vr doc/doxy/html/* /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
279find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type f -exec chmod -c 0644 \{} \; &amp;&amp;
280find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type d -exec chmod -c 0755 \{} \;</userinput></screen>
281
282 <para>
283 To properly test the installation you must have <xref linkend="rsync"/>
284 installed and follow the instructions for the <ulink
285 url="https://www.ffmpeg.org/fate.html"> FFmpeg Automated Testing
286 Environment</ulink> (FATE). First, about 1 GB of sample files used to
287 run FATE are downloaded with the command:
288 </para>
289
290<screen remap="test"><userinput>make fate-rsync SAMPLES=fate-suite/</userinput></screen>
291
292 <para>
293 The <filename class="directory">fate-suite</filename> directory is
294 created and the files are downloaded there. That command actually runs an
295 rsync command to obtain the sample files. You may want to compress and
296 keep this directory for testing again, for testing in another system,
297 or for when a new version of ffmpeg is released. Then, unpack the sample
298 files in the source directory, and run the <command>make fate-rsync
299 ...</command> command above to sync with the upstream repository. The
300 download size and time are drastically reduced by doing this. Estimated
301 values in "Package Information" do not include the download SBU. Some
302 samples may have been removed in newer versions, so in order to be sure
303 local and server fate samples are identical when you use previously
304 saved samples, run the following command:
305 </para>
306
307<screen role="nodump"><userinput>rsync -vrltLW --delete --timeout=60 --contimeout=60 \
308 rsync://fate-suite.ffmpeg.org/fate-suite/ fate-suite/</userinput></screen>
309
310 <para>
311 Next, execute FATE with the following commands (there are more than 3800
312 tests in the suite):
313 </para>
314
315<screen remap="test"><userinput>make fate THREADS=<replaceable>N</replaceable> SAMPLES=fate-suite/ | tee ../fate.log &amp;&amp;
316grep ^TEST ../fate.log | wc -l</userinput></screen>
317
318 <para>
319 where <replaceable>N</replaceable> is an integer,
320 <replaceable>N</replaceable> &le; number of cores in the system.
321 </para>
322
323 <para>
324 A successful run should return no errors or warnings, just a list of tests
325 and total amount at the end.
326 </para>
327
328 </sect2>
329
330 <sect2 role="commands">
331 <title>Command Explanations</title>
332
333
334 <para>
335 <command>find ... ;</command>: Fixes permissions of documentation files
336 and directories.
337 </para>
338
339 <para>
340 <parameter>--enable-libfreetype</parameter>: Enables
341 <application>Freetype</application> support.
342 </para>
343
344 <para>
345 <parameter>--enable-gpl</parameter>: Enables the use of GPL code and
346 permits support for postprocessing, swscale and many other features.
347 </para>
348
349 <para>
350 <parameter>--enable-version3</parameter>: Enables the use of (L)GPL
351 version 3 code.
352 </para>
353
354 <para>
355 <parameter>--enable-nonfree</parameter>: Enables the use of nonfree code.
356 Note that the resulting libraries and binaries will be unredistributable.
357 </para>
358
359 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
360 href="../../xincludes/static-libraries.xml"/>
361
362 <para>
363 <parameter>--enable-shared</parameter>: Enables building shared
364 libraries, otherwise only static libraries are built and installed.
365 </para>
366
367 <para>
368 <parameter>--disable-debug</parameter>: Disables building debugging
369 symbols into the programs and libraries.
370 </para>
371
372 <para>
373 <parameter>--enable-libaom</parameter>: Enables AV1 audio and video
374 decoding via <filename class="libraryfile">libaom</filename>.
375 </para>
376
377 <para>
378 <parameter>--enable-libass</parameter>: Enables ASS/SSA subtitle format
379 rendering via <filename class="libraryfile">libass</filename>.
380 </para>
381
382 <para>
383 <option>--enable-libdrm</option>: Use this switch if
384 <xref linkend="libdrm"/> is installed to build the <quote>kmsgrab</quote>
385 input module which is useful for screen capturing or streaming.
386 </para>
387
388 <para>
389 <parameter>--enable-libfdk-aac</parameter>: Enables AAC audio encoding via
390 <filename class="libraryfile">libfdk-aac</filename>.
391 </para>
392
393 <para>
394 <parameter>--enable-libmp3lame</parameter>: Enables MP3 audio encoding
395 via <filename class="libraryfile">libmp3lame</filename>.
396 </para>
397<!--
398 <para>
399 <parameter>- -enable-libvorbis</parameter>
400 <parameter>- -enable-libtheora</parameter>: Enables
401 Theora video encoding via <filename
402 class="libraryfile">libvorbis</filename> and <filename
403 class="libraryfile">libtheora</filename>.
404 </para>
405-->
406 <para>
407 <parameter>--enable-libvorbis</parameter>
408 <parameter>--enable-libvpx</parameter>: Enables WebM
409 encoding via <filename class="libraryfile">libvorbis</filename> and
410 <filename class="libraryfile">libvpx</filename>.
411 </para>
412
413 <para>
414 <parameter>--enable-libx264</parameter>: Enables high-quality
415 H.264/MPEG-4 AVC encoding via <filename
416 class="libraryfile">libx264</filename>.
417 </para>
418
419 <para>
420 <parameter>--enable-libx265</parameter>: Enables high-quality
421 H.265/HEVC encoding via <filename
422 class="libraryfile">libx265</filename>.
423 </para>
424
425 <para>
426 <parameter>--enable-openssl</parameter>:
427 Enables HTTPS protocol for network streams.
428 </para>
429
430 <!--
431 <para>
432 <parameter>- -disable-vulkan</parameter>: Disables Vulkan for the
433 current version of <xref linkend="vulkan-loader"/> due to
434 an API conflict.
435 </para>
436 -->
437
438 <para>
439 <parameter>--ignore-tests=...</parameter>: Disables tests that fail to
440 run on
441 BLFS without the optional packages. Currently the AV1 test is disabled
442 as it needs dav1d to do AV1 decoding on the CPU. The test might work if
443 you have a GPU that can decode AV1, but this was not tested.
444 </para>
445
446 <para>
447 <option>--enable-gnutls</option>: Use this option instead of
448 <parameter>--enable-openssl</parameter>, if you want to use
449 <application>GnuTLS</application> instead of
450 <application>OpenSSL</application> for HTTPS protocol.
451 </para>
452
453 <para>
454 <option>--disable-doc</option>: Disables building html documentation.
455 This is only needed if <xref linkend="doxygen"/> is installed and you
456 do not want to build the html documentation.
457 </para>
458
459 <para>
460 <option>--enable-libpulse</option>: Enables support for
461 <application>Pulseaudio</application> for audio output.
462 </para>
463
464 <para>
465 <command>gcc tools/qt-faststart.c -o tools/qt-faststart</command>: This
466 builds the <command>qt-faststart</command> program which can modify
467 QuickTime formatted movies (<filename class="extension">.mov</filename>
468 or <filename class="extension">.mp4</filename>) so that the header
469 information is located at the beginning of the file instead of the end.
470 This allows the movie file to begin playing before the entire file has
471 been downloaded.
472 </para>
473
474 <note>
475 <para>
476 Support for most of the dependency packages requires using options
477 passed to the <command>configure</command> script. View the output
478 from <command>./configure --help</command> for complete information
479 about enabling dependency packages.
480 </para>
481 </note>
482
483 </sect2>
484
485 <sect2 role="content">
486 <title>Contents</title>
487
488 <segmentedlist>
489 <segtitle>Installed Programs</segtitle>
490 <segtitle>Installed Libraries</segtitle>
491 <segtitle>Installed Directories</segtitle>
492
493 <seglistitem>
494 <seg>
495 ffmpeg, ffplay, ffprobe, <!--ffserver,--> and qt-faststart
496 </seg>
497 <seg>
498 libavcodec.so, libavdevice.so, libavfilter.so,
499 libavformat.so, libavutil.so, libpostproc.so,
500 libswresample.so, and libswscale.so
501 </seg>
502 <seg>
503 /usr/include/libav{codec,device,filter,format,util},
504 /usr/include/libpostproc,
505 /usr/include/libsw{resample,scale},
506 /usr/share/doc/ffmpeg-&ffmpeg-version;, and
507 /usr/share/ffmpeg
508 </seg>
509 </seglistitem>
510 </segmentedlist>
511
512 <variablelist>
513 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
514 <?dbfo list-presentation="list"?>
515 <?dbhtml list-presentation="table"?>
516
517 <varlistentry id="ffmpeg-prog">
518 <term><command>ffmpeg</command></term>
519 <listitem>
520 <para>
521 is a command-line tool to convert video files, network streams and
522 input from a TV card to several video formats
523 </para>
524 <indexterm zone="ffmpeg ffmpeg-prog">
525 <primary sortas="b-ffmpeg">ffmpeg</primary>
526 </indexterm>
527 </listitem>
528 </varlistentry>
529
530 <varlistentry id="ffplay">
531 <term><command>ffplay</command></term>
532 <listitem>
533 <para>
534 is a very simple and portable media player using the
535 <filename>ffmpeg</filename> libraries and the SDL library
536 </para>
537 <indexterm zone="ffmpeg ffplay">
538 <primary sortas="b-ffplay">ffplay</primary>
539 </indexterm>
540 </listitem>
541 </varlistentry>
542
543 <varlistentry id="ffprobe">
544 <term><command>ffprobe</command></term>
545 <listitem>
546 <para>
547 gathers information from multimedia streams and prints it in a human
548 and machine-readable fashion
549 </para>
550 <indexterm zone="ffmpeg ffprobe">
551 <primary sortas="b-ffprobe">ffprobe</primary>
552 </indexterm>
553 </listitem>
554 </varlistentry>
555
556 <varlistentry id="qt-faststart">
557 <term><command>qt-faststart</command></term>
558 <listitem>
559 <para>
560 moves the index file to the front of quicktime (mov/mp4) videos
561 </para>
562 <indexterm zone="ffmpeg qt-faststart">
563 <primary sortas="b-qt-faststart">qt-faststart</primary>
564 </indexterm>
565 </listitem>
566 </varlistentry>
567
568 <varlistentry id="libavcodec">
569 <term><filename class="libraryfile">libavcodec.so</filename></term>
570 <listitem>
571 <para>
572 is a library containing the <application>FFmpeg</application> codecs
573 (both encoding and decoding)
574 </para>
575 <indexterm zone="ffmpeg libavcodec">
576 <primary sortas="c-libavcodec">libavcodec.so</primary>
577 </indexterm>
578 </listitem>
579 </varlistentry>
580
581 <varlistentry id="libavdevice">
582 <term><filename class="libraryfile">libavdevice.so</filename></term>
583 <listitem>
584 <para>
585 is the <application>FFmpeg</application> device handling library
586 </para>
587 <indexterm zone="ffmpeg libavdevice">
588 <primary sortas="c-libavdevice">libavdevice.so</primary>
589 </indexterm>
590 </listitem>
591 </varlistentry>
592
593 <varlistentry id="libavfilter">
594 <term><filename class="libraryfile">libavfilter.so</filename></term>
595 <listitem>
596 <para>
597 is a library of filters that can alter video or audio between the
598 decoder and the encoder (or output)
599 </para>
600 <indexterm zone="ffmpeg libavfilter">
601 <primary sortas="c-libavfilter">libavfilter.so</primary>
602 </indexterm>
603 </listitem>
604 </varlistentry>
605
606 <varlistentry id="libavformat">
607 <term><filename class="libraryfile">libavformat.so</filename></term>
608 <listitem>
609 <para>
610 is a library containing the file formats handling (mux and demux
611 code for several formats) used by <command>ffplay</command> as well
612 as allowing the generation of audio or video streams
613 </para>
614 <indexterm zone="ffmpeg libavformat">
615 <primary sortas="c-libavformat">libavformat.so</primary>
616 </indexterm>
617 </listitem>
618 </varlistentry>
619
620 <varlistentry id="libavresample">
621 <term><filename class="libraryfile">libavresample.so</filename></term>
622 <listitem>
623 <para>
624 is a library containing functions for resampling audio and video.
625 </para>
626 <indexterm zone="ffmpeg libavresample">
627 <primary sortas="c-libavresample">libavresample</primary>
628 </indexterm>
629 </listitem>
630 </varlistentry>
631
632 <varlistentry id="libavutil">
633 <term><filename class="libraryfile">libavutil.so</filename></term>
634 <listitem>
635 <para>
636 is the <application>FFmpeg</application> utility library
637 </para>
638 <indexterm zone="ffmpeg libavutil">
639 <primary sortas="c-libavutil">libavutil.so</primary>
640 </indexterm>
641 </listitem>
642 </varlistentry>
643
644 <varlistentry id="libpostproc">
645 <term><filename class="libraryfile">libpostproc.so</filename></term>
646 <listitem>
647 <para>
648 is the <application>FFmpeg</application> post processing library
649 </para>
650 <indexterm zone="ffmpeg libpostproc">
651 <primary sortas="c-libpostproc">libpostproc.so</primary>
652 </indexterm>
653 </listitem>
654 </varlistentry>
655
656 <varlistentry id="libswresample">
657 <term><filename class="libraryfile">libswresample.so</filename></term>
658 <listitem>
659 <para>
660 is the <application>FFmpeg</application> audio rescaling library,
661 it contains functions for converting audio sample formats
662 </para>
663 <indexterm zone="ffmpeg libswresample">
664 <primary sortas="c-libswresample">libswresample.so</primary>
665 </indexterm>
666 </listitem>
667 </varlistentry>
668
669 <varlistentry id="libswscale">
670 <term><filename class="libraryfile">libswscale.so</filename></term>
671 <listitem>
672 <para>
673 is the <application>FFmpeg</application> image rescaling library
674 </para>
675 <indexterm zone="ffmpeg libswscale">
676 <primary sortas="c-libswscale">libswscale.so</primary>
677 </indexterm>
678 </listitem>
679 </varlistentry>
680
681 </variablelist>
682
683 </sect2>
684
685</sect1>
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