source: multimedia/videoutils/ffmpeg.xml@ c9e2494

12.1 gimp3 ken/TL2024 lazarus plabs/newcss rahul/power-profiles-daemon trunk xry111/llvm18
Last change on this file since c9e2494 was ce402041, checked in by Bruce Dubbs <bdubbs@…>, 6 months ago

Demote libtheora to optional in ffmpeg.

This will allow specifying libtheora as an external dependency
and will enable archiving libtheora.

libtheora has not been updated since 2010 and its use is outdated.
  • Property mode set to 100644
File size: 23.8 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 "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 &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 </itemizedlist>
85
86 <bridgehead renderas="sect3">FFmpeg Dependencies</bridgehead>
87
88 <bridgehead renderas="sect4">Recommended</bridgehead>
89 <para role="recommended">
90 <xref linkend="libaom"/>,
91 <xref linkend="libass"/>,
92 <xref linkend="fdk-aac"/>,
93 <xref linkend="freetype2"/>,
94 <xref linkend="lame"/>,
95 <xref linkend="libvorbis"/>,
96 <xref linkend="libvpx"/>,
97 <xref linkend="opus"/>,
98 <xref linkend="x264"/>,
99 <xref linkend="x265"/>, and
100 <xref linkend="nasm"/> or <xref linkend="yasm"/>
101 </para>
102
103 <bridgehead renderas="sect4">Recommended for desktop use</bridgehead>
104 <para role="recommended">
105 <xref linkend="alsa-lib"/>,
106 <xref linkend="libva"/>,
107 <xref linkend="libvdpau"/> (with the corresponding driver package), and
108 <xref linkend="sdl2"/>
109 </para>
110
111 <bridgehead renderas="sect4">Optional</bridgehead>
112 <para role="optional">
113 <xref linkend="doxygen"/>,
114 <xref linkend="fontconfig"/>,
115 <xref linkend="fribidi"/>,
116 <xref linkend="frei0r"/>,
117 <xref linkend="libcdio"/> (to identify and play CDs),
118 <xref linkend="libdrm"/> (for <quote>kmsgrab</quote> input),
119 <xref linkend="libtheora"/>,
120 <xref linkend="libwebp"/>,
121 <xref linkend="opencv"/>,
122 <xref linkend="openjpeg2"/>,
123 <xref linkend="gnutls"/>,
124 <xref linkend="pulseaudio"/>,
125 <xref linkend="samba"/>,
126 <xref linkend="speex"/>,
127 <xref linkend="texlive"/>
128 (or <xref linkend="tl-installer"/>) for PDF and PS documentation,
129 <xref linkend="v4l-utils"/>,
130 <xref linkend="vulkan-loader"/>,
131 <xref linkend="xvid"/>,
132 <xref linkend="x-window-system"/>,
133 <ulink url="https://code.videolan.org/videolan/dav1d">dav1d</ulink>,
134 <ulink url="https://github.com/festvox/flite">Flite</ulink>,
135 <ulink url="https://www.quut.com/gsm/">GSM</ulink>,
136 <ulink url="https://tipok.org.ua/node/17">libaacplus</ulink>,
137 <ulink url="https://www.videolan.org/developers/libbluray.html">libbluray</ulink>,
138 <ulink url="https://github.com/cacalabs/libcaca">libcaca</ulink>,
139 <ulink url="https://gitlab.xiph.org/xiph/celt">libcelt</ulink>,
140 <ulink url="https://sourceforge.net/projects/libdc1394">libdc1394</ulink>,
141 <ulink url="https://www.videolan.org/developers/libdca.html">libdca</ulink>,
142 <ulink url="https://ieee1394.wiki.kernel.org/index.php/Libraries">libiec61883</ulink>,
143 <ulink url="https://github.com/dekkers/libilbc">libilbc</ulink>,
144 <ulink url="https://sourceforge.net/projects/modplug-xmms/">libmodplug</ulink>,
145 <ulink url="https://github.com/Distrotech/libnut">libnut</ulink> (Git checkout),
146 <ulink url="https://rtmpdump.mplayerhq.hu/">librtmp</ulink>,
147 <ulink url="https://www.libssh.org/">libssh</ulink>,
148 <ulink url="https://openal.org/">OpenAL</ulink>,
149 <ulink url="https://sourceforge.net/projects/opencore-amr">OpenCore AMR</ulink>,
150 <ulink url="https://github.com/Haivision/srt">Srt</ulink>,
151 <ulink url="https://sourceforge.net/projects/schrodinger/">Schroedinger</ulink>,
152 <ulink url="https://www.twolame.org/">TwoLAME</ulink>,
153 <ulink url="https://sourceforge.net/projects/opencore-amr/files/vo-aacenc/">vo-aaenc</ulink>,
154 <ulink url="https://sourceforge.net/projects/opencore-amr/files/vo-amrwbenc/">vo-amrwbenc</ulink>, and
155 <!--<ulink url="https://vulkan.org/">Vulkan</ulink>, and-->
156 <ulink url="https://zapping.sourceforge.net/ZVBI/">ZVBI</ulink>
157 </para>
158
159 </sect2>
160
161 <sect2 role="installation">
162 <title>Installation of FFmpeg</title>
163
164 <para>
165 First, apply a patch that adds an API necessary for some packages to
166 build:
167 <!-- qtwebengine -->
168 </para>
169
170<screen><userinput remap="pre">patch -Np1 -i ../ffmpeg-&ffmpeg-version;-chromium_method-1.patch</userinput></screen>
171
172 <para>
173 Install <application>FFmpeg</application> by running the following
174 commands:
175 </para>
176
177<screen><userinput>./configure --prefix=/usr \
178 --enable-gpl \
179 --enable-version3 \
180 --enable-nonfree \
181 --disable-static \
182 --enable-shared \
183 --disable-debug \
184 --enable-libaom \
185 --enable-libass \
186 --enable-libfdk-aac \
187 --enable-libfreetype \
188 --enable-libmp3lame \
189 --enable-libopus \
190 --enable-libvorbis \
191 --enable-libvpx \
192 --enable-libx264 \
193 --enable-libx265 \
194 --enable-openssl \
195 --ignore-tests=enhanced-flv-av1 \
196 --docdir=/usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
197
198make &amp;&amp;
199
200gcc tools/qt-faststart.c -o tools/qt-faststart</userinput></screen>
201
202 <para>
203 HTML documentation was built in the previous step. If you have
204 <xref linkend="texlive"/> installed and wish to build PDF and
205 Postscript versions of the documentation, issue the following commands:
206 </para>
207
208<screen remap="doc"><userinput>pushd doc &amp;&amp;
209for DOCNAME in `basename -s .html *.html`
210do
211 texi2pdf -b $DOCNAME.texi &amp;&amp;
212 texi2dvi -b $DOCNAME.texi &amp;&amp;
213
214 dvips -o $DOCNAME.ps \
215 $DOCNAME.dvi
216done &amp;&amp;
217popd &amp;&amp;
218unset DOCNAME</userinput></screen>
219
220 <para>
221 If you have <xref linkend="doxygen"/> installed
222 and you wish to build (if --disable-doc was
223 used) or rebuild the html documentation, issue:
224 </para>
225
226<screen remap="doc"><userinput>doxygen doc/Doxyfile</userinput></screen>
227
228 <para>
229 The fate-suite tests include comparisons with installed files, and should
230 not be run before the package is installed. Therefore, if you desire to
231 run them, instructions are given further below.
232 </para>
233
234 <para>
235 Now, as the <systemitem class="username">root</systemitem> user:
236 </para>
237
238<screen role="root"><userinput>make install &amp;&amp;
239
240install -v -m755 tools/qt-faststart /usr/bin &amp;&amp;
241install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
242install -v -m644 doc/*.txt /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
243
244 <para>
245 If the PDF and Postscript documentation was built, issue the following
246 commands, as the <systemitem class="username">root</systemitem> user, to
247 install them:
248 </para>
249
250<screen role="root"
251 remap="doc"><userinput>install -v -m644 doc/*.pdf /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
252install -v -m644 doc/*.ps /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
253
254 <para>
255 If you used <command>doxygen</command> to manually create the API
256 documentation, install it by issuing the following commands
257 as the <systemitem class="username">root</systemitem> user:
258 </para>
259
260<screen role="root"
261 remap="doc"><userinput>install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
262cp -vr doc/doxy/html/* /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
263find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type f -exec chmod -c 0644 \{} \; &amp;&amp;
264find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type d -exec chmod -c 0755 \{} \;</userinput></screen>
265
266 <para>
267 To properly test the installation you must have <xref linkend="rsync"/>
268 installed and follow the instructions for the <ulink
269 url="https://www.ffmpeg.org/fate.html"> FFmpeg Automated Testing
270 Environment</ulink> (FATE). First, about 1 GB of sample files used to
271 run FATE are downloaded with the command:
272 </para>
273
274<screen remap="test"><userinput>make fate-rsync SAMPLES=fate-suite/</userinput></screen>
275
276 <para>
277 The <filename class="directory">fate-suite</filename> directory is
278 created and the files are downloaded there. That command actually runs an
279 rsync command to obtain the sample files. You may want to compress and
280 keep this directory for testing again, for testing in another system,
281 or for when a new version of ffmpeg is released. Then, unpack the sample
282 files in the source directory, and run the <command>make fate-rsync
283 ...</command> command above to sync with the upstream repository. The
284 download size and time are drastically reduced by doing this. Estimated
285 values in "Package Information" do not include the download SBU. Some
286 samples may have been removed in newer versions, so in order to be sure
287 local and server fate samples are identical when you use previously
288 saved samples, run the following command:
289 </para>
290
291<screen role="nodump"><userinput>rsync -vrltLW --delete --timeout=60 --contimeout=60 \
292 rsync://fate-suite.ffmpeg.org/fate-suite/ fate-suite/</userinput></screen>
293
294 <para>
295 Next, execute FATE with the following commands (there are more than 3800
296 tests in the suite):
297 </para>
298
299<screen remap="test"><userinput>make fate THREADS=<replaceable>N</replaceable> SAMPLES=fate-suite/ | tee ../fate.log &amp;&amp;
300grep ^TEST ../fate.log | wc -l</userinput></screen>
301
302 <para>
303 where <replaceable>N</replaceable> is an integer,
304 <replaceable>N</replaceable> &le; number of cores in the system.
305 </para>
306
307 <para>
308 A successful run should return no errors or warnings, just a list of tests
309 and total amount at the end.
310 </para>
311
312 </sect2>
313
314 <sect2 role="commands">
315 <title>Command Explanations</title>
316
317
318 <para>
319 <command>find ... ;</command>: Fixes permissions of documentation files
320 and directories.
321 </para>
322
323 <para>
324 <parameter>--enable-libfreetype</parameter>: Enables
325 <application>Freetype</application> support.
326 </para>
327
328 <para>
329 <parameter>--enable-gpl</parameter>: Enables the use of GPL code and
330 permits support for postprocessing, swscale and many other features.
331 </para>
332
333 <para>
334 <parameter>--enable-version3</parameter>: Enables the use of (L)GPL
335 version 3 code.
336 </para>
337
338 <para>
339 <parameter>--enable-nonfree</parameter>: Enables the use of nonfree code.
340 Note that the resulting libraries and binaries will be unredistributable.
341 </para>
342
343 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
344 href="../../xincludes/static-libraries.xml"/>
345
346 <para>
347 <parameter>--enable-shared</parameter>: Enables building shared
348 libraries, otherwise only static libraries are built and installed.
349 </para>
350
351 <para>
352 <parameter>--disable-debug</parameter>: Disables building debugging
353 symbols into the programs and libraries.
354 </para>
355
356 <para>
357 <parameter>--enable-libaom</parameter>: Enables AV1 audio and video
358 decoding via <filename class="libraryfile">libaom</filename>.
359 </para>
360
361 <para>
362 <parameter>--enable-libass</parameter>: Enables ASS/SSA subtitle format
363 rendering via <filename class="libraryfile">libass</filename>.
364 </para>
365
366 <para>
367 <option>--enable-libdrm</option>: Use this switch if
368 <xref linkend="libdrm"/> is installed to build the <quote>kmsgrab</quote>
369 input module which is useful for screen capturing or streaming.
370 </para>
371
372 <para>
373 <parameter>--enable-libfdk-aac</parameter>: Enables AAC audio encoding via
374 <filename class="libraryfile">libfdk-aac</filename>.
375 </para>
376
377 <para>
378 <parameter>--enable-libmp3lame</parameter>: Enables MP3 audio encoding
379 via <filename class="libraryfile">libmp3lame</filename>.
380 </para>
381<!--
382 <para>
383 <parameter>- -enable-libvorbis</parameter>
384 <parameter>- -enable-libtheora</parameter>: Enables
385 Theora video encoding via <filename
386 class="libraryfile">libvorbis</filename> and <filename
387 class="libraryfile">libtheora</filename>.
388 </para>
389-->
390 <para>
391 <parameter>--enable-libvorbis</parameter>
392 <parameter>--enable-libvpx</parameter>: Enables WebM
393 encoding via <filename class="libraryfile">libvorbis</filename> and
394 <filename class="libraryfile">libvpx</filename>.
395 </para>
396
397 <para>
398 <parameter>--enable-libx264</parameter>: Enables high-quality
399 H.264/MPEG-4 AVC encoding via <filename
400 class="libraryfile">libx264</filename>.
401 </para>
402
403 <para>
404 <parameter>--enable-libx265</parameter>: Enables high-quality
405 H.265/HEVC encoding via <filename
406 class="libraryfile">libx265</filename>.
407 </para>
408
409 <para>
410 <parameter>--enable-openssl</parameter>:
411 Enables HTTPS protocol for network streams.
412 </para>
413
414 <para>
415 <option>--enable-gnutls</option>: Use this option instead of
416 <parameter>--enable-openssl</parameter>, if you want to use
417 <application>GnuTLS</application> instead of
418 <application>OpenSSL</application> for HTTPS protocol.
419 </para>
420
421 <para>
422 <option>--disable-doc</option>: Disables building html documentation.
423 This is only needed if <xref linkend="doxygen"/> is installed and you
424 do not want to build the html documentation.
425 </para>
426
427 <para>
428 <option>--enable-libpulse</option>: Enables support for
429 <application>Pulseaudio</application> for audio output.
430 </para>
431
432 <para>
433 <option>--enable-vulkan</option>: Enables support for using Vulkan for
434 video acceleration.
435 </para>
436
437 <para>
438 <option>--ignore-tests=...</option>: Disables tests that fail to run on
439 BLFS without the optional packages. Currently the AV1 test is disabled
440 as it needs dav1d to do AV1 decoding on the CPU. The test might work if
441 you have a GPU that can decode AV1, but this was not tested.
442 </para>
443
444 <para>
445 <command>gcc tools/qt-faststart.c -o tools/qt-faststart</command>: This
446 builds the <command>qt-faststart</command> program which can modify
447 QuickTime formatted movies (<filename class="extension">.mov</filename>
448 or <filename class="extension">.mp4</filename>) so that the header
449 information is located at the beginning of the file instead of the end.
450 This allows the movie file to begin playing before the entire file has
451 been downloaded.
452 </para>
453
454 <note>
455 <para>
456 Support for most of the dependency packages requires using options
457 passed to the <command>configure</command> script. View the output
458 from <command>./configure --help</command> for complete information
459 about enabling dependency packages.
460 </para>
461 </note>
462
463 </sect2>
464
465 <sect2 role="content">
466 <title>Contents</title>
467
468 <segmentedlist>
469 <segtitle>Installed Programs</segtitle>
470 <segtitle>Installed Libraries</segtitle>
471 <segtitle>Installed Directories</segtitle>
472
473 <seglistitem>
474 <seg>
475 ffmpeg, ffplay, ffprobe, <!--ffserver,--> and qt-faststart
476 </seg>
477 <seg>
478 libavcodec.so, libavdevice.so, libavfilter.so,
479 libavformat.so, libavutil.so, libpostproc.so,
480 libswresample.so, and libswscale.so
481 </seg>
482 <seg>
483 /usr/include/libav{codec,device,filter,format,util},
484 /usr/include/libpostproc,
485 /usr/include/libsw{resample,scale},
486 /usr/share/doc/ffmpeg-&ffmpeg-version;, and
487 /usr/share/ffmpeg
488 </seg>
489 </seglistitem>
490 </segmentedlist>
491
492 <variablelist>
493 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
494 <?dbfo list-presentation="list"?>
495 <?dbhtml list-presentation="table"?>
496
497 <varlistentry id="ffmpeg-prog">
498 <term><command>ffmpeg</command></term>
499 <listitem>
500 <para>
501 is a command-line tool to convert video files, network streams and
502 input from a TV card to several video formats
503 </para>
504 <indexterm zone="ffmpeg ffmpeg-prog">
505 <primary sortas="b-ffmpeg">ffmpeg</primary>
506 </indexterm>
507 </listitem>
508 </varlistentry>
509
510 <varlistentry id="ffplay">
511 <term><command>ffplay</command></term>
512 <listitem>
513 <para>
514 is a very simple and portable media player using the
515 <filename>ffmpeg</filename> libraries and the SDL library
516 </para>
517 <indexterm zone="ffmpeg ffplay">
518 <primary sortas="b-ffplay">ffplay</primary>
519 </indexterm>
520 </listitem>
521 </varlistentry>
522
523 <varlistentry id="ffprobe">
524 <term><command>ffprobe</command></term>
525 <listitem>
526 <para>
527 gathers information from multimedia streams and prints it in a human
528 and machine-readable fashion
529 </para>
530 <indexterm zone="ffmpeg ffprobe">
531 <primary sortas="b-ffprobe">ffprobe</primary>
532 </indexterm>
533 </listitem>
534 </varlistentry>
535
536 <varlistentry id="qt-faststart">
537 <term><command>qt-faststart</command></term>
538 <listitem>
539 <para>
540 moves the index file to the front of quicktime (mov/mp4) videos
541 </para>
542 <indexterm zone="ffmpeg qt-faststart">
543 <primary sortas="b-qt-faststart">qt-faststart</primary>
544 </indexterm>
545 </listitem>
546 </varlistentry>
547
548 <varlistentry id="libavcodec">
549 <term><filename class="libraryfile">libavcodec.so</filename></term>
550 <listitem>
551 <para>
552 is a library containing the <application>FFmpeg</application> codecs
553 (both encoding and decoding)
554 </para>
555 <indexterm zone="ffmpeg libavcodec">
556 <primary sortas="c-libavcodec">libavcodec.so</primary>
557 </indexterm>
558 </listitem>
559 </varlistentry>
560
561 <varlistentry id="libavdevice">
562 <term><filename class="libraryfile">libavdevice.so</filename></term>
563 <listitem>
564 <para>
565 is the <application>FFmpeg</application> device handling library
566 </para>
567 <indexterm zone="ffmpeg libavdevice">
568 <primary sortas="c-libavdevice">libavdevice.so</primary>
569 </indexterm>
570 </listitem>
571 </varlistentry>
572
573 <varlistentry id="libavfilter">
574 <term><filename class="libraryfile">libavfilter.so</filename></term>
575 <listitem>
576 <para>
577 is a library of filters that can alter video or audio between the
578 decoder and the encoder (or output)
579 </para>
580 <indexterm zone="ffmpeg libavfilter">
581 <primary sortas="c-libavfilter">libavfilter.so</primary>
582 </indexterm>
583 </listitem>
584 </varlistentry>
585
586 <varlistentry id="libavformat">
587 <term><filename class="libraryfile">libavformat.so</filename></term>
588 <listitem>
589 <para>
590 is a library containing the file formats handling (mux and demux
591 code for several formats) used by <command>ffplay</command> as well
592 as allowing the generation of audio or video streams
593 </para>
594 <indexterm zone="ffmpeg libavformat">
595 <primary sortas="c-libavformat">libavformat.so</primary>
596 </indexterm>
597 </listitem>
598 </varlistentry>
599
600 <varlistentry id="libavresample">
601 <term><filename class="libraryfile">libavresample.so</filename></term>
602 <listitem>
603 <para>
604 is a library containing functions for resampling audio and video.
605 </para>
606 <indexterm zone="ffmpeg libavresample">
607 <primary sortas="c-libavresample">libavresample</primary>
608 </indexterm>
609 </listitem>
610 </varlistentry>
611
612 <varlistentry id="libavutil">
613 <term><filename class="libraryfile">libavutil.so</filename></term>
614 <listitem>
615 <para>
616 is the <application>FFmpeg</application> utility library
617 </para>
618 <indexterm zone="ffmpeg libavutil">
619 <primary sortas="c-libavutil">libavutil.so</primary>
620 </indexterm>
621 </listitem>
622 </varlistentry>
623
624 <varlistentry id="libpostproc">
625 <term><filename class="libraryfile">libpostproc.so</filename></term>
626 <listitem>
627 <para>
628 is the <application>FFmpeg</application> post processing library
629 </para>
630 <indexterm zone="ffmpeg libpostproc">
631 <primary sortas="c-libpostproc">libpostproc.so</primary>
632 </indexterm>
633 </listitem>
634 </varlistentry>
635
636 <varlistentry id="libswresample">
637 <term><filename class="libraryfile">libswresample.so</filename></term>
638 <listitem>
639 <para>
640 is the <application>FFmpeg</application> audio rescaling library,
641 it contains functions for converting audio sample formats
642 </para>
643 <indexterm zone="ffmpeg libswresample">
644 <primary sortas="c-libswresample">libswresample.so</primary>
645 </indexterm>
646 </listitem>
647 </varlistentry>
648
649 <varlistentry id="libswscale">
650 <term><filename class="libraryfile">libswscale.so</filename></term>
651 <listitem>
652 <para>
653 is the <application>FFmpeg</application> image rescaling library
654 </para>
655 <indexterm zone="ffmpeg libswscale">
656 <primary sortas="c-libswscale">libswscale.so</primary>
657 </indexterm>
658 </listitem>
659 </varlistentry>
660
661 </variablelist>
662
663 </sect2>
664
665</sect1>
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