source: multimedia/videoutils/ffmpeg.xml@ e8b3f50

12.1 ken/TL2024 lazarus trunk xry111/llvm18
Last change on this file since e8b3f50 was 181e069f, checked in by Bruce Dubbs <bdubbs@…>, 4 months ago

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