source: multimedia/videoutils/ffmpeg.xml@ 33a303b

trunk
Last change on this file since 33a303b was 426ee9f, checked in by Douglas R. Reno <renodr@…>, 2 months ago

ffmpeg: enable Vulkan support again.

Thanks to Joe Locash for a pointer to the patch

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