source: multimedia/videoutils/ffmpeg.xml@ 24975c4

12.1 ken/TL2024 ken/tuningfonts lazarus plabs/newcss python3.11 rahul/power-profiles-daemon renodr/vulkan-addition trunk xry111/llvm18
Last change on this file since 24975c4 was 485a5616, checked in by Douglas R. Reno <renodr@…>, 8 months ago

ffmpeg: fix building with texinfo-7.1 installed.

Thanks goes to Joe Locash for the report and ticket
  • Property mode set to 100644
File size: 24.5 KB
Line 
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 "https://ffmpeg.org/releases/ffmpeg-&ffmpeg-version;.tar.xz">
8 <!ENTITY ffmpeg-download-ftp " ">
9 <!ENTITY ffmpeg-md5sum "47b6c5d930937413c3e308e2fdb3dfb5">
10 <!ENTITY ffmpeg-size "9.8 MB">
11 <!ENTITY ffmpeg-buildsize "187 MB (add 1.5 GB for the FATE suite/tests, add 786 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 &lfs120_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;-binutils_2.41-1.patch"/>
88 </para>
89 </listitem>
90 <listitem>
91 <para>
92 Required patch:
93 <ulink url="&patch-root;/ffmpeg-&ffmpeg-version;-texinfo7_fixes-1.patch"/>
94 </para>
95 </listitem>
96 </itemizedlist>
97
98 <bridgehead renderas="sect3">FFmpeg Dependencies</bridgehead>
99
100 <bridgehead renderas="sect4">Recommended</bridgehead>
101 <para role="recommended">
102 <xref linkend="libaom"/>,
103 <xref linkend="libass"/>,
104 <xref linkend="fdk-aac"/>,
105 <xref linkend="freetype2"/>,
106 <xref linkend="lame"/>,
107 <xref linkend="libtheora"/>,
108 <xref linkend="libvorbis"/>,
109 <xref linkend="libvpx"/>,
110 <xref linkend="opus"/>,
111 <xref linkend="x264"/>,
112 <xref linkend="x265"/>, and
113 <xref linkend="nasm"/> or <xref linkend="yasm"/>
114 </para>
115
116 <bridgehead renderas="sect4">Recommended for desktop use</bridgehead>
117 <para role="recommended">
118 <xref linkend="alsa-lib"/>,
119 <xref linkend="libva"/>,
120 <xref linkend="libvdpau"/> (with the corresponding driver package), and
121 <xref linkend="sdl2"/>
122 </para>
123
124 <bridgehead renderas="sect4">Optional</bridgehead>
125 <para role="optional">
126 <xref linkend="doxygen"/>,
127 <xref linkend="fontconfig"/>,
128 <xref linkend="fribidi"/>,
129 <xref linkend="frei0r"/>,
130 <xref linkend="libcdio"/> (to identify and play CDs),
131 <xref linkend="libdrm"/> (for <quote>kmsgrab</quote> input),
132 <xref linkend="libwebp"/>,
133 <xref linkend="opencv"/>,
134 <xref linkend="openjpeg2"/>,
135 <xref linkend="gnutls"/>,
136 <xref linkend="pulseaudio"/>,
137 <xref linkend="samba"/>,
138 <xref linkend="speex"/>,
139 <xref linkend="texlive"/>
140 (or <xref linkend="tl-installer"/>) for PDF and PS documentation,
141 <xref linkend="v4l-utils"/>,
142 <xref linkend="xvid"/>,
143 <xref linkend="x-window-system"/>,
144 <ulink url="https://github.com/festvox/flite">Flite</ulink>,
145 <ulink url="https://www.quut.com/gsm/">GSM</ulink>,
146 <ulink url="https://tipok.org.ua/node/17">libaacplus</ulink>,
147 <ulink url="https://www.videolan.org/developers/libbluray.html">libbluray</ulink>,
148 <ulink url="https://github.com/cacalabs/libcaca">libcaca</ulink>,
149 <ulink url="https://gitlab.xiph.org/xiph/celt">libcelt</ulink>,
150 <ulink url="https://sourceforge.net/projects/libdc1394">libdc1394</ulink>,
151 <ulink url="https://www.videolan.org/developers/libdca.html">libdca</ulink>,
152 <ulink url="https://ieee1394.wiki.kernel.org/index.php/Libraries">libiec61883</ulink>,
153 <ulink url="https://github.com/dekkers/libilbc">libilbc</ulink>,
154 <ulink url="https://sourceforge.net/projects/modplug-xmms/">libmodplug</ulink>,
155 <ulink url="https://github.com/Distrotech/libnut">libnut</ulink> (Git checkout),
156 <ulink url="https://rtmpdump.mplayerhq.hu/">librtmp</ulink>,
157 <ulink url="https://www.libssh.org/">libssh</ulink>,
158 <ulink url="https://openal.org/">OpenAL</ulink>,
159 <ulink url="https://sourceforge.net/projects/opencore-amr">OpenCore AMR</ulink>,
160 <ulink url="https://github.com/Haivision/srt">Srt</ulink>,
161 <ulink url="https://sourceforge.net/projects/schrodinger/">Schroedinger</ulink>,
162 <ulink url="https://www.twolame.org/">TwoLAME</ulink>,
163 <ulink url="https://sourceforge.net/projects/opencore-amr/files/vo-aacenc/">vo-aaenc</ulink>,
164 <ulink url="https://sourceforge.net/projects/opencore-amr/files/vo-amrwbenc/">vo-amrwbenc</ulink>, and
165 <ulink url="https://zapping.sourceforge.net/ZVBI/">ZVBI</ulink>
166 </para>
167
168 </sect2>
169
170 <sect2 role="installation">
171 <title>Installation of FFmpeg</title>
172
173 <note>
174 <para>
175 Some harmless warnings may be output by the build process regarding
176 the HTML documentation. This is due to an incompatibility with
177 Texinfo-7.0 and higher.
178 </para>
179 </note>
180
181 <para>
182 First, apply a patch that adds an API necessary for some packages to
183 build:
184 <!-- qtwebengine -->
185 </para>
186
187<screen><userinput remap="pre">patch -Np1 -i ../ffmpeg-&ffmpeg-version;-chromium_method-1.patch</userinput></screen>
188
189 <para>
190 Now, apply a patch that allows the package to build with binutils-2.41:
191 <!-- From upstream -->
192 </para>
193
194<screen><userinput remap="pre">patch -Np1 -i ../ffmpeg-&ffmpeg-version;-binutils_2.41-1.patch</userinput></screen>
195
196 <para>
197 Next, apply a patch that fixes building the documentation with texinfo-7:
198 <!-- From upstream -->
199 </para>
200
201<screen><userinput remap="pre">patch -Np1 -i ../ffmpeg-&ffmpeg-version;-texinfo7_fixes-1.patch</userinput></screen>
202
203 <para>
204 Install <application>FFmpeg</application> by running the following
205 commands:
206 </para>
207
208<screen><userinput>./configure --prefix=/usr \
209 --enable-gpl \
210 --enable-version3 \
211 --enable-nonfree \
212 --disable-static \
213 --enable-shared \
214 --disable-debug \
215 --enable-libaom \
216 --enable-libass \
217 --enable-libfdk-aac \
218 --enable-libfreetype \
219 --enable-libmp3lame \
220 --enable-libopus \
221 --enable-libtheora \
222 --enable-libvorbis \
223 --enable-libvpx \
224 --enable-libx264 \
225 --enable-libx265 \
226 --enable-openssl \
227 --docdir=/usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
228
229make &amp;&amp;
230
231gcc tools/qt-faststart.c -o tools/qt-faststart</userinput></screen>
232
233 <para>
234 HTML documentation was built in the previous step. If you have
235 <xref linkend="texlive"/> installed and wish to build PDF and
236 Postscript versions of the documentation, issue the following commands:
237 </para>
238
239<screen remap="doc"><userinput>pushd doc &amp;&amp;
240for DOCNAME in `basename -s .html *.html`
241do
242 texi2pdf -b $DOCNAME.texi &amp;&amp;
243 texi2dvi -b $DOCNAME.texi &amp;&amp;
244
245 dvips -o $DOCNAME.ps \
246 $DOCNAME.dvi
247done &amp;&amp;
248popd &amp;&amp;
249unset DOCNAME</userinput></screen>
250
251 <para>
252 If you have <xref linkend="doxygen"/> installed
253 and you wish to build (if --disable-doc was
254 used) or rebuild the html documentation, issue:
255 </para>
256
257<screen remap="doc"><userinput>doxygen doc/Doxyfile</userinput></screen>
258
259 <para>
260 The fate-suite tests include comparisons with installed files, and should
261 not be run before the package is installed. Therefore, if you desire to
262 run them, instructions are given further below.
263 </para>
264
265 <para>
266 Now, as the <systemitem class="username">root</systemitem> user:
267 </para>
268
269<screen role="root"><userinput>make install &amp;&amp;
270
271install -v -m755 tools/qt-faststart /usr/bin &amp;&amp;
272install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
273install -v -m644 doc/*.txt /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
274
275 <para>
276 If the PDF and Postscript documentation was built, issue the following
277 commands, as the <systemitem class="username">root</systemitem> user, to
278 install them:
279 </para>
280
281<screen role="root"
282 remap="doc"><userinput>install -v -m644 doc/*.pdf /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
283install -v -m644 doc/*.ps /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
284
285 <para>
286 If you used <command>doxygen</command> to manually create the API
287 documentation, install it by issuing the following commands
288 as the <systemitem class="username">root</systemitem> user:
289 </para>
290
291<screen role="root"
292 remap="doc"><userinput>install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
293cp -vr doc/doxy/html/* /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
294find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type f -exec chmod -c 0644 \{} \; &amp;&amp;
295find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type d -exec chmod -c 0755 \{} \;</userinput></screen>
296
297 <para>
298 To properly test the installation you must have <xref linkend="rsync"/>
299 installed and follow the instructions for the <ulink
300 url="https://www.ffmpeg.org/fate.html"> FFmpeg Automated Testing
301 Environment</ulink> (FATE). First, about 1 GB of sample files used to
302 run FATE are downloaded with the command:
303 </para>
304
305<screen remap="test"><userinput>make fate-rsync SAMPLES=fate-suite/</userinput></screen>
306
307 <para>
308 The <filename class="directory">fate-suite</filename> directory is
309 created and the files are downloaded there. That command actually runs an
310 rsync command to obtain the sample files. You may want to compress and
311 keep this directory for testing again, for testing in another system,
312 or for when a new version of ffmpeg is released. Then, unpack the sample
313 files in the source directory, and run the <command>make fate-rsync
314 ...</command> command above to sync with the upstream repository. The
315 download size and time are drastically reduced by doing this. Estimated
316 values in "Package Information" do not include the download SBU. Some
317 samples may have been removed in newer versions, so in order to be sure
318 local and server fate samples are identical when you use previously
319 saved samples, run the following command:
320 </para>
321
322<screen role="nodump"><userinput>rsync -vrltLW --delete --timeout=60 --contimeout=60 \
323 rsync://fate-suite.ffmpeg.org/fate-suite/ fate-suite/</userinput></screen>
324
325 <para>
326 Next, execute FATE with the following commands (there are more than 3800
327 tests in the suite):
328 </para>
329
330<screen remap="test"><userinput>make fate THREADS=<replaceable>N</replaceable> SAMPLES=fate-suite/ | tee ../fate.log &amp;&amp;
331grep ^TEST ../fate.log | wc -l</userinput></screen>
332
333 <para>
334 where <replaceable>N</replaceable> is an integer,
335 <replaceable>N</replaceable> &le; number of cores in the system.
336 </para>
337
338 <para>
339 A successful run should return no errors or warnings, just a list of tests
340 and total amount at the end.
341 </para>
342
343 </sect2>
344
345 <sect2 role="commands">
346 <title>Command Explanations</title>
347
348 <para>
349 <command>sed -i ... configure</command>: This command adds the
350 <application>ALSA</application> library to the
351 <application>Flite</application> <envar>LDFLAGS</envar> variable and
352 enables the discovery of <application>Flite</application>.
353 </para>
354
355 <para>
356 <command>find ... ;</command>: Fixes permissions of documentation files
357 and directories.
358 </para>
359
360 <para>
361 <parameter>--enable-libfreetype</parameter>: Enables
362 <application>Freetype</application> support.
363 </para>
364
365 <para>
366 <parameter>--enable-gpl</parameter>: Enables the use of GPL code and
367 permits support for postprocessing, swscale and many other features.
368 </para>
369
370 <para>
371 <parameter>--enable-version3</parameter>: Enables the use of (L)GPL
372 version 3 code.
373 </para>
374
375 <para>
376 <parameter>--enable-nonfree</parameter>: Enables the use of nonfree code.
377 Note that the resulting libraries and binaries will be unredistributable.
378 </para>
379
380 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
381 href="../../xincludes/static-libraries.xml"/>
382
383 <para>
384 <parameter>--enable-shared</parameter>: Enables building shared
385 libraries, otherwise only static libraries are built and installed.
386 </para>
387
388 <para>
389 <parameter>--disable-debug</parameter>: Disables building debugging
390 symbols into the programs and libraries.
391 </para>
392
393 <para>
394 <parameter>--enable-libaom</parameter>: Enables AV1 audio and video
395 decoding via <filename class="libraryfile">libaom</filename>.
396 </para>
397
398 <para>
399 <parameter>--enable-libass</parameter>: Enables ASS/SSA subtitle format
400 rendering via <filename class="libraryfile">libass</filename>.
401 </para>
402
403 <para>
404 <option>--enable-libdrm</option>: Use this switch if
405 <xref linkend="libdrm"/> is installed to build the <quote>kmsgrab</quote>
406 input module which is useful for screen capturing or streaming.
407 </para>
408
409 <para>
410 <parameter>--enable-libfdk-aac</parameter>: Enables AAC audio encoding via
411 <filename class="libraryfile">libfdk-aac</filename>.
412 </para>
413
414 <para>
415 <parameter>--enable-libmp3lame</parameter>: Enables MP3 audio encoding
416 via <filename class="libraryfile">libmp3lame</filename>.
417 </para>
418
419 <para>
420 <parameter>--enable-libvorbis --enable-libtheora</parameter>: Enables
421 Theora video encoding via <filename
422 class="libraryfile">libvorbis</filename> and <filename
423 class="libraryfile">libtheora</filename>.
424 </para>
425
426 <para>
427 <parameter>--enable-libvorbis --enable-libvpx</parameter>: Enables WebM
428 encoding via <filename class="libraryfile">libvorbis</filename> and
429 <filename class="libraryfile">libvpx</filename>.
430 </para>
431
432 <para>
433 <parameter>--enable-libx264</parameter>: Enables high-quality
434 H.264/MPEG-4 AVC encoding via <filename
435 class="libraryfile">libx264</filename>.
436 </para>
437
438 <para>
439 <parameter>--enable-libx265</parameter>: Enables high-quality
440 H.265/HEVC encoding via <filename
441 class="libraryfile">libx265</filename>.
442 </para>
443
444 <para>
445 <parameter>--enable-openssl</parameter>:
446 Enables HTTPS protocol for network streams.
447 </para>
448
449 <para>
450 <option>--enable-gnutls</option>: Use this option instead of
451 <parameter>--enable-openssl</parameter>, if you want to use
452 <application>GnuTLS</application> instead of
453 <application>OpenSSL</application> for HTTPS protocol.
454 </para>
455
456 <para>
457 <option>--disable-doc</option>: Disables building html documentation.
458 This is only needed if <xref linkend="doxygen"/> is installed and you
459 do not want to build the html documentation.
460 </para>
461
462 <para>
463 <option>--enable-libpulse</option>: Enables support for
464 <application>Pulseaudio</application> for audio output.
465 </para>
466
467 <para>
468 <command>gcc tools/qt-faststart.c -o tools/qt-faststart</command>: This
469 builds the <command>qt-faststart</command> program which can modify
470 QuickTime formatted movies (<filename class="extension">.mov</filename>
471 or <filename class="extension">.mp4</filename>) so that the header
472 information is located at the beginning of the file instead of the end.
473 This allows the movie file to begin playing before the entire file has
474 been downloaded.
475 </para>
476
477 <note>
478 <para>
479 Support for most of the dependency packages requires using options
480 passed to the <command>configure</command> script. View the output
481 from <command>./configure --help</command> for complete information
482 about enabling dependency packages.
483 </para>
484 </note>
485
486 </sect2>
487
488 <sect2 role="content">
489 <title>Contents</title>
490
491 <segmentedlist>
492 <segtitle>Installed Programs</segtitle>
493 <segtitle>Installed Libraries</segtitle>
494 <segtitle>Installed Directories</segtitle>
495
496 <seglistitem>
497 <seg>
498 ffmpeg, ffplay, ffprobe, <!--ffserver,--> and qt-faststart
499 </seg>
500 <seg>
501 libavcodec.so, libavdevice.so, libavfilter.so,
502 libavformat.so, libavutil.so, libpostproc.so,
503 libswresample.so, and libswscale.so
504 </seg>
505 <seg>
506 /usr/include/libav{codec,device,filter,format,util},
507 /usr/include/libpostproc,
508 /usr/include/libsw{resample,scale},
509 /usr/share/doc/ffmpeg-&ffmpeg-version;, and
510 /usr/share/ffmpeg
511 </seg>
512 </seglistitem>
513 </segmentedlist>
514
515 <variablelist>
516 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
517 <?dbfo list-presentation="list"?>
518 <?dbhtml list-presentation="table"?>
519
520 <varlistentry id="ffmpeg-prog">
521 <term><command>ffmpeg</command></term>
522 <listitem>
523 <para>
524 is a command-line tool to convert video files, network streams and
525 input from a TV card to several video formats
526 </para>
527 <indexterm zone="ffmpeg ffmpeg-prog">
528 <primary sortas="b-ffmpeg">ffmpeg</primary>
529 </indexterm>
530 </listitem>
531 </varlistentry>
532
533 <varlistentry id="ffplay">
534 <term><command>ffplay</command></term>
535 <listitem>
536 <para>
537 is a very simple and portable media player using the
538 <filename>ffmpeg</filename> libraries and the SDL library
539 </para>
540 <indexterm zone="ffmpeg ffplay">
541 <primary sortas="b-ffplay">ffplay</primary>
542 </indexterm>
543 </listitem>
544 </varlistentry>
545
546 <varlistentry id="ffprobe">
547 <term><command>ffprobe</command></term>
548 <listitem>
549 <para>
550 gathers information from multimedia streams and prints it in a human
551 and machine-readable fashion
552 </para>
553 <indexterm zone="ffmpeg ffprobe">
554 <primary sortas="b-ffprobe">ffprobe</primary>
555 </indexterm>
556 </listitem>
557 </varlistentry>
558
559 <varlistentry id="qt-faststart">
560 <term><command>qt-faststart</command></term>
561 <listitem>
562 <para>
563 moves the index file to the front of quicktime (mov/mp4) videos
564 </para>
565 <indexterm zone="ffmpeg qt-faststart">
566 <primary sortas="b-qt-faststart">qt-faststart</primary>
567 </indexterm>
568 </listitem>
569 </varlistentry>
570
571 <varlistentry id="libavcodec">
572 <term><filename class="libraryfile">libavcodec.so</filename></term>
573 <listitem>
574 <para>
575 is a library containing the <application>FFmpeg</application> codecs
576 (both encoding and decoding)
577 </para>
578 <indexterm zone="ffmpeg libavcodec">
579 <primary sortas="c-libavcodec">libavcodec.so</primary>
580 </indexterm>
581 </listitem>
582 </varlistentry>
583
584 <varlistentry id="libavdevice">
585 <term><filename class="libraryfile">libavdevice.so</filename></term>
586 <listitem>
587 <para>
588 is the <application>FFmpeg</application> device handling library
589 </para>
590 <indexterm zone="ffmpeg libavdevice">
591 <primary sortas="c-libavdevice">libavdevice.so</primary>
592 </indexterm>
593 </listitem>
594 </varlistentry>
595
596 <varlistentry id="libavfilter">
597 <term><filename class="libraryfile">libavfilter.so</filename></term>
598 <listitem>
599 <para>
600 is a library of filters that can alter video or audio between the
601 decoder and the encoder (or output)
602 </para>
603 <indexterm zone="ffmpeg libavfilter">
604 <primary sortas="c-libavfilter">libavfilter.so</primary>
605 </indexterm>
606 </listitem>
607 </varlistentry>
608
609 <varlistentry id="libavformat">
610 <term><filename class="libraryfile">libavformat.so</filename></term>
611 <listitem>
612 <para>
613 is a library containing the file formats handling (mux and demux
614 code for several formats) used by <command>ffplay</command> as well
615 as allowing the generation of audio or video streams
616 </para>
617 <indexterm zone="ffmpeg libavformat">
618 <primary sortas="c-libavformat">libavformat.so</primary>
619 </indexterm>
620 </listitem>
621 </varlistentry>
622
623 <varlistentry id="libavresample">
624 <term><filename class="libraryfile">libavresample.so</filename></term>
625 <listitem>
626 <para>
627 is a library containing functions for resampling audio and video.
628 </para>
629 <indexterm zone="ffmpeg libavresample">
630 <primary sortas="c-libavresample">libavresample</primary>
631 </indexterm>
632 </listitem>
633 </varlistentry>
634
635 <varlistentry id="libavutil">
636 <term><filename class="libraryfile">libavutil.so</filename></term>
637 <listitem>
638 <para>
639 is the <application>FFmpeg</application> utility library
640 </para>
641 <indexterm zone="ffmpeg libavutil">
642 <primary sortas="c-libavutil">libavutil.so</primary>
643 </indexterm>
644 </listitem>
645 </varlistentry>
646
647 <varlistentry id="libpostproc">
648 <term><filename class="libraryfile">libpostproc.so</filename></term>
649 <listitem>
650 <para>
651 is the <application>FFmpeg</application> post processing library
652 </para>
653 <indexterm zone="ffmpeg libpostproc">
654 <primary sortas="c-libpostproc">libpostproc.so</primary>
655 </indexterm>
656 </listitem>
657 </varlistentry>
658
659 <varlistentry id="libswresample">
660 <term><filename class="libraryfile">libswresample.so</filename></term>
661 <listitem>
662 <para>
663 is the <application>FFmpeg</application> audio rescaling library,
664 it contains functions for converting audio sample formats
665 </para>
666 <indexterm zone="ffmpeg libswresample">
667 <primary sortas="c-libswresample">libswresample.so</primary>
668 </indexterm>
669 </listitem>
670 </varlistentry>
671
672 <varlistentry id="libswscale">
673 <term><filename class="libraryfile">libswscale.so</filename></term>
674 <listitem>
675 <para>
676 is the <application>FFmpeg</application> image rescaling library
677 </para>
678 <indexterm zone="ffmpeg libswscale">
679 <primary sortas="c-libswscale">libswscale.so</primary>
680 </indexterm>
681 </listitem>
682 </varlistentry>
683
684 </variablelist>
685
686 </sect2>
687
688</sect1>
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