source: multimedia/videoutils/ffmpeg.xml@ 55239a6

12.1 ken/TL2024 lazarus plabs/newcss rahul/power-profiles-daemon trunk xry111/llvm18
Last change on this file since 55239a6 was 875b3b57, checked in by Pierre Labastie <pierre.labastie@…>, 7 months ago

Fix various option vs parameter problems

Sometimes there is no really a problem, but alos avoids that
automatic detection with "make test-options" return false positives
  • Property mode set to 100644
File size: 23.7 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 "5898f671dca522f537c3b57d1d6b57a3">
10 <!ENTITY ffmpeg-size "10 MB">
11 <!ENTITY ffmpeg-buildsize "239 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://github.com/festvox/flite">Flite</ulink>,
134 <ulink url="https://www.quut.com/gsm/">GSM</ulink>,
135 <ulink url="https://tipok.org.ua/node/17">libaacplus</ulink>,
136 <ulink url="https://www.videolan.org/developers/libbluray.html">libbluray</ulink>,
137 <ulink url="https://github.com/cacalabs/libcaca">libcaca</ulink>,
138 <ulink url="https://gitlab.xiph.org/xiph/celt">libcelt</ulink>,
139 <ulink url="https://sourceforge.net/projects/libdc1394">libdc1394</ulink>,
140 <ulink url="https://www.videolan.org/developers/libdca.html">libdca</ulink>,
141 <ulink url="https://ieee1394.wiki.kernel.org/index.php/Libraries">libiec61883</ulink>,
142 <ulink url="https://github.com/dekkers/libilbc">libilbc</ulink>,
143 <ulink url="https://sourceforge.net/projects/modplug-xmms/">libmodplug</ulink>,
144 <ulink url="https://github.com/Distrotech/libnut">libnut</ulink> (Git checkout),
145 <ulink url="https://rtmpdump.mplayerhq.hu/">librtmp</ulink>,
146 <ulink url="https://www.libssh.org/">libssh</ulink>,
147 <ulink url="https://openal.org/">OpenAL</ulink>,
148 <ulink url="https://sourceforge.net/projects/opencore-amr">OpenCore AMR</ulink>,
149 <ulink url="https://github.com/Haivision/srt">Srt</ulink>,
150 <ulink url="https://sourceforge.net/projects/schrodinger/">Schroedinger</ulink>,
151 <ulink url="https://www.twolame.org/">TwoLAME</ulink>,
152 <ulink url="https://sourceforge.net/projects/opencore-amr/files/vo-aacenc/">vo-aaenc</ulink>,
153 <ulink url="https://sourceforge.net/projects/opencore-amr/files/vo-amrwbenc/">vo-amrwbenc</ulink>, and
154 <!--<ulink url="https://vulkan.org/">Vulkan</ulink>, and-->
155 <ulink url="https://zapping.sourceforge.net/ZVBI/">ZVBI</ulink>
156 </para>
157
158 </sect2>
159
160 <sect2 role="installation">
161 <title>Installation of FFmpeg</title>
162
163 <para>
164 First, apply a patch that adds an API necessary for some packages to
165 build:
166 <!-- qtwebengine -->
167 </para>
168
169<screen><userinput remap="pre">patch -Np1 -i ../ffmpeg-&ffmpeg-version;-chromium_method-1.patch</userinput></screen>
170
171 <para>
172 Install <application>FFmpeg</application> by running the following
173 commands:
174 </para>
175
176<screen><userinput>./configure --prefix=/usr \
177 --enable-gpl \
178 --enable-version3 \
179 --enable-nonfree \
180 --disable-static \
181 --enable-shared \
182 --disable-debug \
183 --enable-libaom \
184 --enable-libass \
185 --enable-libfdk-aac \
186 --enable-libfreetype \
187 --enable-libmp3lame \
188 --enable-libopus \
189 --enable-libtheora \
190 --enable-libvorbis \
191 --enable-libvpx \
192 --enable-libx264 \
193 --enable-libx265 \
194 --enable-openssl \
195 --docdir=/usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
196
197make &amp;&amp;
198
199gcc tools/qt-faststart.c -o tools/qt-faststart</userinput></screen>
200
201 <para>
202 HTML documentation was built in the previous step. If you have
203 <xref linkend="texlive"/> installed and wish to build PDF and
204 Postscript versions of the documentation, issue the following commands:
205 </para>
206
207<screen remap="doc"><userinput>pushd doc &amp;&amp;
208for DOCNAME in `basename -s .html *.html`
209do
210 texi2pdf -b $DOCNAME.texi &amp;&amp;
211 texi2dvi -b $DOCNAME.texi &amp;&amp;
212
213 dvips -o $DOCNAME.ps \
214 $DOCNAME.dvi
215done &amp;&amp;
216popd &amp;&amp;
217unset DOCNAME</userinput></screen>
218
219 <para>
220 If you have <xref linkend="doxygen"/> installed
221 and you wish to build (if --disable-doc was
222 used) or rebuild the html documentation, issue:
223 </para>
224
225<screen remap="doc"><userinput>doxygen doc/Doxyfile</userinput></screen>
226
227 <para>
228 The fate-suite tests include comparisons with installed files, and should
229 not be run before the package is installed. Therefore, if you desire to
230 run them, instructions are given further below.
231 </para>
232
233 <para>
234 Now, as the <systemitem class="username">root</systemitem> user:
235 </para>
236
237<screen role="root"><userinput>make install &amp;&amp;
238
239install -v -m755 tools/qt-faststart /usr/bin &amp;&amp;
240install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
241install -v -m644 doc/*.txt /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
242
243 <para>
244 If the PDF and Postscript documentation was built, issue the following
245 commands, as the <systemitem class="username">root</systemitem> user, to
246 install them:
247 </para>
248
249<screen role="root"
250 remap="doc"><userinput>install -v -m644 doc/*.pdf /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
251install -v -m644 doc/*.ps /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
252
253 <para>
254 If you used <command>doxygen</command> to manually create the API
255 documentation, install it by issuing the following commands
256 as the <systemitem class="username">root</systemitem> user:
257 </para>
258
259<screen role="root"
260 remap="doc"><userinput>install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
261cp -vr doc/doxy/html/* /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
262find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type f -exec chmod -c 0644 \{} \; &amp;&amp;
263find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type d -exec chmod -c 0755 \{} \;</userinput></screen>
264
265 <para>
266 To properly test the installation you must have <xref linkend="rsync"/>
267 installed and follow the instructions for the <ulink
268 url="https://www.ffmpeg.org/fate.html"> FFmpeg Automated Testing
269 Environment</ulink> (FATE). First, about 1 GB of sample files used to
270 run FATE are downloaded with the command:
271 </para>
272
273<screen remap="test"><userinput>make fate-rsync SAMPLES=fate-suite/</userinput></screen>
274
275 <para>
276 The <filename class="directory">fate-suite</filename> directory is
277 created and the files are downloaded there. That command actually runs an
278 rsync command to obtain the sample files. You may want to compress and
279 keep this directory for testing again, for testing in another system,
280 or for when a new version of ffmpeg is released. Then, unpack the sample
281 files in the source directory, and run the <command>make fate-rsync
282 ...</command> command above to sync with the upstream repository. The
283 download size and time are drastically reduced by doing this. Estimated
284 values in "Package Information" do not include the download SBU. Some
285 samples may have been removed in newer versions, so in order to be sure
286 local and server fate samples are identical when you use previously
287 saved samples, run the following command:
288 </para>
289
290<screen role="nodump"><userinput>rsync -vrltLW --delete --timeout=60 --contimeout=60 \
291 rsync://fate-suite.ffmpeg.org/fate-suite/ fate-suite/</userinput></screen>
292
293 <para>
294 Next, execute FATE with the following commands (there are more than 3800
295 tests in the suite):
296 </para>
297
298<screen remap="test"><userinput>make fate THREADS=<replaceable>N</replaceable> SAMPLES=fate-suite/ | tee ../fate.log &amp;&amp;
299grep ^TEST ../fate.log | wc -l</userinput></screen>
300
301 <para>
302 where <replaceable>N</replaceable> is an integer,
303 <replaceable>N</replaceable> &le; number of cores in the system.
304 </para>
305
306 <para>
307 A successful run should return no errors or warnings, just a list of tests
308 and total amount at the end.
309 </para>
310
311 </sect2>
312
313 <sect2 role="commands">
314 <title>Command Explanations</title>
315
316 <para>
317 <command>sed -i ... configure</command>: This command adds the
318 <application>ALSA</application> library to the
319 <application>Flite</application> <envar>LDFLAGS</envar> variable and
320 enables the discovery of <application>Flite</application>.
321 </para>
322
323 <para>
324 <command>find ... ;</command>: Fixes permissions of documentation files
325 and directories.
326 </para>
327
328 <para>
329 <parameter>--enable-libfreetype</parameter>: Enables
330 <application>Freetype</application> support.
331 </para>
332
333 <para>
334 <parameter>--enable-gpl</parameter>: Enables the use of GPL code and
335 permits support for postprocessing, swscale and many other features.
336 </para>
337
338 <para>
339 <parameter>--enable-version3</parameter>: Enables the use of (L)GPL
340 version 3 code.
341 </para>
342
343 <para>
344 <parameter>--enable-nonfree</parameter>: Enables the use of nonfree code.
345 Note that the resulting libraries and binaries will be unredistributable.
346 </para>
347
348 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
349 href="../../xincludes/static-libraries.xml"/>
350
351 <para>
352 <parameter>--enable-shared</parameter>: Enables building shared
353 libraries, otherwise only static libraries are built and installed.
354 </para>
355
356 <para>
357 <parameter>--disable-debug</parameter>: Disables building debugging
358 symbols into the programs and libraries.
359 </para>
360
361 <para>
362 <parameter>--enable-libaom</parameter>: Enables AV1 audio and video
363 decoding via <filename class="libraryfile">libaom</filename>.
364 </para>
365
366 <para>
367 <parameter>--enable-libass</parameter>: Enables ASS/SSA subtitle format
368 rendering via <filename class="libraryfile">libass</filename>.
369 </para>
370
371 <para>
372 <option>--enable-libdrm</option>: Use this switch if
373 <xref linkend="libdrm"/> is installed to build the <quote>kmsgrab</quote>
374 input module which is useful for screen capturing or streaming.
375 </para>
376
377 <para>
378 <parameter>--enable-libfdk-aac</parameter>: Enables AAC audio encoding via
379 <filename class="libraryfile">libfdk-aac</filename>.
380 </para>
381
382 <para>
383 <parameter>--enable-libmp3lame</parameter>: Enables MP3 audio encoding
384 via <filename class="libraryfile">libmp3lame</filename>.
385 </para>
386
387 <para>
388 <parameter>--enable-libvorbis</parameter>
389 <parameter>--enable-libtheora</parameter>: Enables
390 Theora video encoding via <filename
391 class="libraryfile">libvorbis</filename> and <filename
392 class="libraryfile">libtheora</filename>.
393 </para>
394
395 <para>
396 <parameter>--enable-libvorbis</parameter>
397 <parameter>--enable-libvpx</parameter>: Enables WebM
398 encoding via <filename class="libraryfile">libvorbis</filename> and
399 <filename class="libraryfile">libvpx</filename>.
400 </para>
401
402 <para>
403 <parameter>--enable-libx264</parameter>: Enables high-quality
404 H.264/MPEG-4 AVC encoding via <filename
405 class="libraryfile">libx264</filename>.
406 </para>
407
408 <para>
409 <parameter>--enable-libx265</parameter>: Enables high-quality
410 H.265/HEVC encoding via <filename
411 class="libraryfile">libx265</filename>.
412 </para>
413
414 <para>
415 <parameter>--enable-openssl</parameter>:
416 Enables HTTPS protocol for network streams.
417 </para>
418
419 <para>
420 <option>--enable-gnutls</option>: Use this option instead of
421 <parameter>--enable-openssl</parameter>, if you want to use
422 <application>GnuTLS</application> instead of
423 <application>OpenSSL</application> for HTTPS protocol.
424 </para>
425
426 <para>
427 <option>--disable-doc</option>: Disables building html documentation.
428 This is only needed if <xref linkend="doxygen"/> is installed and you
429 do not want to build the html documentation.
430 </para>
431
432 <para>
433 <option>--enable-libpulse</option>: Enables support for
434 <application>Pulseaudio</application> for audio output.
435 </para>
436
437 <para>
438 <option>--enable-vulkan</option>: Enables support for using Vulkan for
439 video acceleration.
440 </para>
441
442 <para>
443 <command>gcc tools/qt-faststart.c -o tools/qt-faststart</command>: This
444 builds the <command>qt-faststart</command> program which can modify
445 QuickTime formatted movies (<filename class="extension">.mov</filename>
446 or <filename class="extension">.mp4</filename>) so that the header
447 information is located at the beginning of the file instead of the end.
448 This allows the movie file to begin playing before the entire file has
449 been downloaded.
450 </para>
451
452 <note>
453 <para>
454 Support for most of the dependency packages requires using options
455 passed to the <command>configure</command> script. View the output
456 from <command>./configure --help</command> for complete information
457 about enabling dependency packages.
458 </para>
459 </note>
460
461 </sect2>
462
463 <sect2 role="content">
464 <title>Contents</title>
465
466 <segmentedlist>
467 <segtitle>Installed Programs</segtitle>
468 <segtitle>Installed Libraries</segtitle>
469 <segtitle>Installed Directories</segtitle>
470
471 <seglistitem>
472 <seg>
473 ffmpeg, ffplay, ffprobe, <!--ffserver,--> and qt-faststart
474 </seg>
475 <seg>
476 libavcodec.so, libavdevice.so, libavfilter.so,
477 libavformat.so, libavutil.so, libpostproc.so,
478 libswresample.so, and libswscale.so
479 </seg>
480 <seg>
481 /usr/include/libav{codec,device,filter,format,util},
482 /usr/include/libpostproc,
483 /usr/include/libsw{resample,scale},
484 /usr/share/doc/ffmpeg-&ffmpeg-version;, and
485 /usr/share/ffmpeg
486 </seg>
487 </seglistitem>
488 </segmentedlist>
489
490 <variablelist>
491 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
492 <?dbfo list-presentation="list"?>
493 <?dbhtml list-presentation="table"?>
494
495 <varlistentry id="ffmpeg-prog">
496 <term><command>ffmpeg</command></term>
497 <listitem>
498 <para>
499 is a command-line tool to convert video files, network streams and
500 input from a TV card to several video formats
501 </para>
502 <indexterm zone="ffmpeg ffmpeg-prog">
503 <primary sortas="b-ffmpeg">ffmpeg</primary>
504 </indexterm>
505 </listitem>
506 </varlistentry>
507
508 <varlistentry id="ffplay">
509 <term><command>ffplay</command></term>
510 <listitem>
511 <para>
512 is a very simple and portable media player using the
513 <filename>ffmpeg</filename> libraries and the SDL library
514 </para>
515 <indexterm zone="ffmpeg ffplay">
516 <primary sortas="b-ffplay">ffplay</primary>
517 </indexterm>
518 </listitem>
519 </varlistentry>
520
521 <varlistentry id="ffprobe">
522 <term><command>ffprobe</command></term>
523 <listitem>
524 <para>
525 gathers information from multimedia streams and prints it in a human
526 and machine-readable fashion
527 </para>
528 <indexterm zone="ffmpeg ffprobe">
529 <primary sortas="b-ffprobe">ffprobe</primary>
530 </indexterm>
531 </listitem>
532 </varlistentry>
533
534 <varlistentry id="qt-faststart">
535 <term><command>qt-faststart</command></term>
536 <listitem>
537 <para>
538 moves the index file to the front of quicktime (mov/mp4) videos
539 </para>
540 <indexterm zone="ffmpeg qt-faststart">
541 <primary sortas="b-qt-faststart">qt-faststart</primary>
542 </indexterm>
543 </listitem>
544 </varlistentry>
545
546 <varlistentry id="libavcodec">
547 <term><filename class="libraryfile">libavcodec.so</filename></term>
548 <listitem>
549 <para>
550 is a library containing the <application>FFmpeg</application> codecs
551 (both encoding and decoding)
552 </para>
553 <indexterm zone="ffmpeg libavcodec">
554 <primary sortas="c-libavcodec">libavcodec.so</primary>
555 </indexterm>
556 </listitem>
557 </varlistentry>
558
559 <varlistentry id="libavdevice">
560 <term><filename class="libraryfile">libavdevice.so</filename></term>
561 <listitem>
562 <para>
563 is the <application>FFmpeg</application> device handling library
564 </para>
565 <indexterm zone="ffmpeg libavdevice">
566 <primary sortas="c-libavdevice">libavdevice.so</primary>
567 </indexterm>
568 </listitem>
569 </varlistentry>
570
571 <varlistentry id="libavfilter">
572 <term><filename class="libraryfile">libavfilter.so</filename></term>
573 <listitem>
574 <para>
575 is a library of filters that can alter video or audio between the
576 decoder and the encoder (or output)
577 </para>
578 <indexterm zone="ffmpeg libavfilter">
579 <primary sortas="c-libavfilter">libavfilter.so</primary>
580 </indexterm>
581 </listitem>
582 </varlistentry>
583
584 <varlistentry id="libavformat">
585 <term><filename class="libraryfile">libavformat.so</filename></term>
586 <listitem>
587 <para>
588 is a library containing the file formats handling (mux and demux
589 code for several formats) used by <command>ffplay</command> as well
590 as allowing the generation of audio or video streams
591 </para>
592 <indexterm zone="ffmpeg libavformat">
593 <primary sortas="c-libavformat">libavformat.so</primary>
594 </indexterm>
595 </listitem>
596 </varlistentry>
597
598 <varlistentry id="libavresample">
599 <term><filename class="libraryfile">libavresample.so</filename></term>
600 <listitem>
601 <para>
602 is a library containing functions for resampling audio and video.
603 </para>
604 <indexterm zone="ffmpeg libavresample">
605 <primary sortas="c-libavresample">libavresample</primary>
606 </indexterm>
607 </listitem>
608 </varlistentry>
609
610 <varlistentry id="libavutil">
611 <term><filename class="libraryfile">libavutil.so</filename></term>
612 <listitem>
613 <para>
614 is the <application>FFmpeg</application> utility library
615 </para>
616 <indexterm zone="ffmpeg libavutil">
617 <primary sortas="c-libavutil">libavutil.so</primary>
618 </indexterm>
619 </listitem>
620 </varlistentry>
621
622 <varlistentry id="libpostproc">
623 <term><filename class="libraryfile">libpostproc.so</filename></term>
624 <listitem>
625 <para>
626 is the <application>FFmpeg</application> post processing library
627 </para>
628 <indexterm zone="ffmpeg libpostproc">
629 <primary sortas="c-libpostproc">libpostproc.so</primary>
630 </indexterm>
631 </listitem>
632 </varlistentry>
633
634 <varlistentry id="libswresample">
635 <term><filename class="libraryfile">libswresample.so</filename></term>
636 <listitem>
637 <para>
638 is the <application>FFmpeg</application> audio rescaling library,
639 it contains functions for converting audio sample formats
640 </para>
641 <indexterm zone="ffmpeg libswresample">
642 <primary sortas="c-libswresample">libswresample.so</primary>
643 </indexterm>
644 </listitem>
645 </varlistentry>
646
647 <varlistentry id="libswscale">
648 <term><filename class="libraryfile">libswscale.so</filename></term>
649 <listitem>
650 <para>
651 is the <application>FFmpeg</application> image rescaling library
652 </para>
653 <indexterm zone="ffmpeg libswscale">
654 <primary sortas="c-libswscale">libswscale.so</primary>
655 </indexterm>
656 </listitem>
657 </varlistentry>
658
659 </variablelist>
660
661 </sect2>
662
663</sect1>
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