source: multimedia/videoutils/ffmpeg.xml@ 8509951

12.1 ken/TL2024 lazarus plabs/newcss rahul/power-profiles-daemon trunk xry111/llvm18
Last change on this file since 8509951 was 8509951, checked in by Rahul Chandra <rahul@…>, 6 months ago

Update to ffmpeg-6.6.1

  • Property mode set to 100644
File size: 23.9 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="libtheora"/>,
96 <xref linkend="libvorbis"/>,
97 <xref linkend="libvpx"/>,
98 <xref linkend="opus"/>,
99 <xref linkend="x264"/>,
100 <xref linkend="x265"/>, and
101 <xref linkend="nasm"/> or <xref linkend="yasm"/>
102 </para>
103
104 <bridgehead renderas="sect4">Recommended for desktop use</bridgehead>
105 <para role="recommended">
106 <xref linkend="alsa-lib"/>,
107 <xref linkend="libva"/>,
108 <xref linkend="libvdpau"/> (with the corresponding driver package), and
109 <xref linkend="sdl2"/>
110 </para>
111
112 <bridgehead renderas="sect4">Optional</bridgehead>
113 <para role="optional">
114 <xref linkend="doxygen"/>,
115 <xref linkend="fontconfig"/>,
116 <xref linkend="fribidi"/>,
117 <xref linkend="frei0r"/>,
118 <xref linkend="libcdio"/> (to identify and play CDs),
119 <xref linkend="libdrm"/> (for <quote>kmsgrab</quote> input),
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-libtheora \
191 --enable-libvorbis \
192 --enable-libvpx \
193 --enable-libx264 \
194 --enable-libx265 \
195 --enable-openssl \
196 --ignore-tests=enhanced-flv-av1 \
197 --docdir=/usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
198
199make &amp;&amp;
200
201gcc tools/qt-faststart.c -o tools/qt-faststart</userinput></screen>
202
203 <para>
204 HTML documentation was built in the previous step. If you have
205 <xref linkend="texlive"/> installed and wish to build PDF and
206 Postscript versions of the documentation, issue the following commands:
207 </para>
208
209<screen remap="doc"><userinput>pushd doc &amp;&amp;
210for DOCNAME in `basename -s .html *.html`
211do
212 texi2pdf -b $DOCNAME.texi &amp;&amp;
213 texi2dvi -b $DOCNAME.texi &amp;&amp;
214
215 dvips -o $DOCNAME.ps \
216 $DOCNAME.dvi
217done &amp;&amp;
218popd &amp;&amp;
219unset DOCNAME</userinput></screen>
220
221 <para>
222 If you have <xref linkend="doxygen"/> installed
223 and you wish to build (if --disable-doc was
224 used) or rebuild the html documentation, issue:
225 </para>
226
227<screen remap="doc"><userinput>doxygen doc/Doxyfile</userinput></screen>
228
229 <para>
230 The fate-suite tests include comparisons with installed files, and should
231 not be run before the package is installed. Therefore, if you desire to
232 run them, instructions are given further below.
233 </para>
234
235 <para>
236 Now, as the <systemitem class="username">root</systemitem> user:
237 </para>
238
239<screen role="root"><userinput>make install &amp;&amp;
240
241install -v -m755 tools/qt-faststart /usr/bin &amp;&amp;
242install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
243install -v -m644 doc/*.txt /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
244
245 <para>
246 If the PDF and Postscript documentation was built, issue the following
247 commands, as the <systemitem class="username">root</systemitem> user, to
248 install them:
249 </para>
250
251<screen role="root"
252 remap="doc"><userinput>install -v -m644 doc/*.pdf /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
253install -v -m644 doc/*.ps /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
254
255 <para>
256 If you used <command>doxygen</command> to manually create the API
257 documentation, install it by issuing the following commands
258 as the <systemitem class="username">root</systemitem> user:
259 </para>
260
261<screen role="root"
262 remap="doc"><userinput>install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
263cp -vr doc/doxy/html/* /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
264find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type f -exec chmod -c 0644 \{} \; &amp;&amp;
265find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type d -exec chmod -c 0755 \{} \;</userinput></screen>
266
267 <para>
268 To properly test the installation you must have <xref linkend="rsync"/>
269 installed and follow the instructions for the <ulink
270 url="https://www.ffmpeg.org/fate.html"> FFmpeg Automated Testing
271 Environment</ulink> (FATE). First, about 1 GB of sample files used to
272 run FATE are downloaded with the command:
273 </para>
274
275<screen remap="test"><userinput>make fate-rsync SAMPLES=fate-suite/</userinput></screen>
276
277 <para>
278 The <filename class="directory">fate-suite</filename> directory is
279 created and the files are downloaded there. That command actually runs an
280 rsync command to obtain the sample files. You may want to compress and
281 keep this directory for testing again, for testing in another system,
282 or for when a new version of ffmpeg is released. Then, unpack the sample
283 files in the source directory, and run the <command>make fate-rsync
284 ...</command> command above to sync with the upstream repository. The
285 download size and time are drastically reduced by doing this. Estimated
286 values in "Package Information" do not include the download SBU. Some
287 samples may have been removed in newer versions, so in order to be sure
288 local and server fate samples are identical when you use previously
289 saved samples, run the following command:
290 </para>
291
292<screen role="nodump"><userinput>rsync -vrltLW --delete --timeout=60 --contimeout=60 \
293 rsync://fate-suite.ffmpeg.org/fate-suite/ fate-suite/</userinput></screen>
294
295 <para>
296 Next, execute FATE with the following commands (there are more than 3800
297 tests in the suite):
298 </para>
299
300<screen remap="test"><userinput>make fate THREADS=<replaceable>N</replaceable> SAMPLES=fate-suite/ | tee ../fate.log &amp;&amp;
301grep ^TEST ../fate.log | wc -l</userinput></screen>
302
303 <para>
304 where <replaceable>N</replaceable> is an integer,
305 <replaceable>N</replaceable> &le; number of cores in the system.
306 </para>
307
308 <para>
309 A successful run should return no errors or warnings, just a list of tests
310 and total amount at the end.
311 </para>
312
313 </sect2>
314
315 <sect2 role="commands">
316 <title>Command Explanations</title>
317
318
319 <para>
320 <command>find ... ;</command>: Fixes permissions of documentation files
321 and directories.
322 </para>
323
324 <para>
325 <parameter>--enable-libfreetype</parameter>: Enables
326 <application>Freetype</application> support.
327 </para>
328
329 <para>
330 <parameter>--enable-gpl</parameter>: Enables the use of GPL code and
331 permits support for postprocessing, swscale and many other features.
332 </para>
333
334 <para>
335 <parameter>--enable-version3</parameter>: Enables the use of (L)GPL
336 version 3 code.
337 </para>
338
339 <para>
340 <parameter>--enable-nonfree</parameter>: Enables the use of nonfree code.
341 Note that the resulting libraries and binaries will be unredistributable.
342 </para>
343
344 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
345 href="../../xincludes/static-libraries.xml"/>
346
347 <para>
348 <parameter>--enable-shared</parameter>: Enables building shared
349 libraries, otherwise only static libraries are built and installed.
350 </para>
351
352 <para>
353 <parameter>--disable-debug</parameter>: Disables building debugging
354 symbols into the programs and libraries.
355 </para>
356
357 <para>
358 <parameter>--enable-libaom</parameter>: Enables AV1 audio and video
359 decoding via <filename class="libraryfile">libaom</filename>.
360 </para>
361
362 <para>
363 <parameter>--enable-libass</parameter>: Enables ASS/SSA subtitle format
364 rendering via <filename class="libraryfile">libass</filename>.
365 </para>
366
367 <para>
368 <option>--enable-libdrm</option>: Use this switch if
369 <xref linkend="libdrm"/> is installed to build the <quote>kmsgrab</quote>
370 input module which is useful for screen capturing or streaming.
371 </para>
372
373 <para>
374 <parameter>--enable-libfdk-aac</parameter>: Enables AAC audio encoding via
375 <filename class="libraryfile">libfdk-aac</filename>.
376 </para>
377
378 <para>
379 <parameter>--enable-libmp3lame</parameter>: Enables MP3 audio encoding
380 via <filename class="libraryfile">libmp3lame</filename>.
381 </para>
382
383 <para>
384 <parameter>--enable-libvorbis</parameter>
385 <parameter>--enable-libtheora</parameter>: Enables
386 Theora video encoding via <filename
387 class="libraryfile">libvorbis</filename> and <filename
388 class="libraryfile">libtheora</filename>.
389 </para>
390
391 <para>
392 <parameter>--enable-libvorbis</parameter>
393 <parameter>--enable-libvpx</parameter>: Enables WebM
394 encoding via <filename class="libraryfile">libvorbis</filename> and
395 <filename class="libraryfile">libvpx</filename>.
396 </para>
397
398 <para>
399 <parameter>--enable-libx264</parameter>: Enables high-quality
400 H.264/MPEG-4 AVC encoding via <filename
401 class="libraryfile">libx264</filename>.
402 </para>
403
404 <para>
405 <parameter>--enable-libx265</parameter>: Enables high-quality
406 H.265/HEVC encoding via <filename
407 class="libraryfile">libx265</filename>.
408 </para>
409
410 <para>
411 <parameter>--enable-openssl</parameter>:
412 Enables HTTPS protocol for network streams.
413 </para>
414
415 <para>
416 <option>--enable-gnutls</option>: Use this option instead of
417 <parameter>--enable-openssl</parameter>, if you want to use
418 <application>GnuTLS</application> instead of
419 <application>OpenSSL</application> for HTTPS protocol.
420 </para>
421
422 <para>
423 <option>--disable-doc</option>: Disables building html documentation.
424 This is only needed if <xref linkend="doxygen"/> is installed and you
425 do not want to build the html documentation.
426 </para>
427
428 <para>
429 <option>--enable-libpulse</option>: Enables support for
430 <application>Pulseaudio</application> for audio output.
431 </para>
432
433 <para>
434 <option>--enable-vulkan</option>: Enables support for using Vulkan for
435 video acceleration.
436 </para>
437
438 <para>
439 <option>--ignore-tests=...</option>: Disables tests that fail to 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 <command>gcc tools/qt-faststart.c -o tools/qt-faststart</command>: This
447 builds the <command>qt-faststart</command> program which can modify
448 QuickTime formatted movies (<filename class="extension">.mov</filename>
449 or <filename class="extension">.mp4</filename>) so that the header
450 information is located at the beginning of the file instead of the end.
451 This allows the movie file to begin playing before the entire file has
452 been downloaded.
453 </para>
454
455 <note>
456 <para>
457 Support for most of the dependency packages requires using options
458 passed to the <command>configure</command> script. View the output
459 from <command>./configure --help</command> for complete information
460 about enabling dependency packages.
461 </para>
462 </note>
463
464 </sect2>
465
466 <sect2 role="content">
467 <title>Contents</title>
468
469 <segmentedlist>
470 <segtitle>Installed Programs</segtitle>
471 <segtitle>Installed Libraries</segtitle>
472 <segtitle>Installed Directories</segtitle>
473
474 <seglistitem>
475 <seg>
476 ffmpeg, ffplay, ffprobe, <!--ffserver,--> and qt-faststart
477 </seg>
478 <seg>
479 libavcodec.so, libavdevice.so, libavfilter.so,
480 libavformat.so, libavutil.so, libpostproc.so,
481 libswresample.so, and libswscale.so
482 </seg>
483 <seg>
484 /usr/include/libav{codec,device,filter,format,util},
485 /usr/include/libpostproc,
486 /usr/include/libsw{resample,scale},
487 /usr/share/doc/ffmpeg-&ffmpeg-version;, and
488 /usr/share/ffmpeg
489 </seg>
490 </seglistitem>
491 </segmentedlist>
492
493 <variablelist>
494 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
495 <?dbfo list-presentation="list"?>
496 <?dbhtml list-presentation="table"?>
497
498 <varlistentry id="ffmpeg-prog">
499 <term><command>ffmpeg</command></term>
500 <listitem>
501 <para>
502 is a command-line tool to convert video files, network streams and
503 input from a TV card to several video formats
504 </para>
505 <indexterm zone="ffmpeg ffmpeg-prog">
506 <primary sortas="b-ffmpeg">ffmpeg</primary>
507 </indexterm>
508 </listitem>
509 </varlistentry>
510
511 <varlistentry id="ffplay">
512 <term><command>ffplay</command></term>
513 <listitem>
514 <para>
515 is a very simple and portable media player using the
516 <filename>ffmpeg</filename> libraries and the SDL library
517 </para>
518 <indexterm zone="ffmpeg ffplay">
519 <primary sortas="b-ffplay">ffplay</primary>
520 </indexterm>
521 </listitem>
522 </varlistentry>
523
524 <varlistentry id="ffprobe">
525 <term><command>ffprobe</command></term>
526 <listitem>
527 <para>
528 gathers information from multimedia streams and prints it in a human
529 and machine-readable fashion
530 </para>
531 <indexterm zone="ffmpeg ffprobe">
532 <primary sortas="b-ffprobe">ffprobe</primary>
533 </indexterm>
534 </listitem>
535 </varlistentry>
536
537 <varlistentry id="qt-faststart">
538 <term><command>qt-faststart</command></term>
539 <listitem>
540 <para>
541 moves the index file to the front of quicktime (mov/mp4) videos
542 </para>
543 <indexterm zone="ffmpeg qt-faststart">
544 <primary sortas="b-qt-faststart">qt-faststart</primary>
545 </indexterm>
546 </listitem>
547 </varlistentry>
548
549 <varlistentry id="libavcodec">
550 <term><filename class="libraryfile">libavcodec.so</filename></term>
551 <listitem>
552 <para>
553 is a library containing the <application>FFmpeg</application> codecs
554 (both encoding and decoding)
555 </para>
556 <indexterm zone="ffmpeg libavcodec">
557 <primary sortas="c-libavcodec">libavcodec.so</primary>
558 </indexterm>
559 </listitem>
560 </varlistentry>
561
562 <varlistentry id="libavdevice">
563 <term><filename class="libraryfile">libavdevice.so</filename></term>
564 <listitem>
565 <para>
566 is the <application>FFmpeg</application> device handling library
567 </para>
568 <indexterm zone="ffmpeg libavdevice">
569 <primary sortas="c-libavdevice">libavdevice.so</primary>
570 </indexterm>
571 </listitem>
572 </varlistentry>
573
574 <varlistentry id="libavfilter">
575 <term><filename class="libraryfile">libavfilter.so</filename></term>
576 <listitem>
577 <para>
578 is a library of filters that can alter video or audio between the
579 decoder and the encoder (or output)
580 </para>
581 <indexterm zone="ffmpeg libavfilter">
582 <primary sortas="c-libavfilter">libavfilter.so</primary>
583 </indexterm>
584 </listitem>
585 </varlistentry>
586
587 <varlistentry id="libavformat">
588 <term><filename class="libraryfile">libavformat.so</filename></term>
589 <listitem>
590 <para>
591 is a library containing the file formats handling (mux and demux
592 code for several formats) used by <command>ffplay</command> as well
593 as allowing the generation of audio or video streams
594 </para>
595 <indexterm zone="ffmpeg libavformat">
596 <primary sortas="c-libavformat">libavformat.so</primary>
597 </indexterm>
598 </listitem>
599 </varlistentry>
600
601 <varlistentry id="libavresample">
602 <term><filename class="libraryfile">libavresample.so</filename></term>
603 <listitem>
604 <para>
605 is a library containing functions for resampling audio and video.
606 </para>
607 <indexterm zone="ffmpeg libavresample">
608 <primary sortas="c-libavresample">libavresample</primary>
609 </indexterm>
610 </listitem>
611 </varlistentry>
612
613 <varlistentry id="libavutil">
614 <term><filename class="libraryfile">libavutil.so</filename></term>
615 <listitem>
616 <para>
617 is the <application>FFmpeg</application> utility library
618 </para>
619 <indexterm zone="ffmpeg libavutil">
620 <primary sortas="c-libavutil">libavutil.so</primary>
621 </indexterm>
622 </listitem>
623 </varlistentry>
624
625 <varlistentry id="libpostproc">
626 <term><filename class="libraryfile">libpostproc.so</filename></term>
627 <listitem>
628 <para>
629 is the <application>FFmpeg</application> post processing library
630 </para>
631 <indexterm zone="ffmpeg libpostproc">
632 <primary sortas="c-libpostproc">libpostproc.so</primary>
633 </indexterm>
634 </listitem>
635 </varlistentry>
636
637 <varlistentry id="libswresample">
638 <term><filename class="libraryfile">libswresample.so</filename></term>
639 <listitem>
640 <para>
641 is the <application>FFmpeg</application> audio rescaling library,
642 it contains functions for converting audio sample formats
643 </para>
644 <indexterm zone="ffmpeg libswresample">
645 <primary sortas="c-libswresample">libswresample.so</primary>
646 </indexterm>
647 </listitem>
648 </varlistentry>
649
650 <varlistentry id="libswscale">
651 <term><filename class="libraryfile">libswscale.so</filename></term>
652 <listitem>
653 <para>
654 is the <application>FFmpeg</application> image rescaling library
655 </para>
656 <indexterm zone="ffmpeg libswscale">
657 <primary sortas="c-libswscale">libswscale.so</primary>
658 </indexterm>
659 </listitem>
660 </varlistentry>
661
662 </variablelist>
663
664 </sect2>
665
666</sect1>
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