source: multimedia/videoutils/ffmpeg.xml@ d50c2d01

12.1 12.2 gimp3 ken/TL2024 lazarus plabs/newcss python3.11 rahul/power-profiles-daemon renodr/vulkan-addition trunk xry111/for-12.3 xry111/llvm18 xry111/spidermonkey128
Last change on this file since d50c2d01 was 978886d8, checked in by Douglas R. Reno <renodr@…>, 10 months ago

VLC and ffmpeg: Add some missed optional dependencies
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File size: 23.5 KB
Line 
1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../../general.ent">
5 %general-entities;
6
7 <!ENTITY ffmpeg-download-http "https://ffmpeg.org/releases/ffmpeg-&ffmpeg-version;.tar.xz">
8 <!ENTITY ffmpeg-download-ftp " ">
9 <!ENTITY ffmpeg-md5sum "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="xvid"/>,
131 <xref linkend="x-window-system"/>,
132 <ulink url="https://github.com/festvox/flite">Flite</ulink>,
133 <ulink url="https://www.quut.com/gsm/">GSM</ulink>,
134 <ulink url="https://tipok.org.ua/node/17">libaacplus</ulink>,
135 <ulink url="https://www.videolan.org/developers/libbluray.html">libbluray</ulink>,
136 <ulink url="https://github.com/cacalabs/libcaca">libcaca</ulink>,
137 <ulink url="https://gitlab.xiph.org/xiph/celt">libcelt</ulink>,
138 <ulink url="https://sourceforge.net/projects/libdc1394">libdc1394</ulink>,
139 <ulink url="https://www.videolan.org/developers/libdca.html">libdca</ulink>,
140 <ulink url="https://ieee1394.wiki.kernel.org/index.php/Libraries">libiec61883</ulink>,
141 <ulink url="https://github.com/dekkers/libilbc">libilbc</ulink>,
142 <ulink url="https://sourceforge.net/projects/modplug-xmms/">libmodplug</ulink>,
143 <ulink url="https://github.com/Distrotech/libnut">libnut</ulink> (Git checkout),
144 <ulink url="https://rtmpdump.mplayerhq.hu/">librtmp</ulink>,
145 <ulink url="https://www.libssh.org/">libssh</ulink>,
146 <ulink url="https://openal.org/">OpenAL</ulink>,
147 <ulink url="https://sourceforge.net/projects/opencore-amr">OpenCore AMR</ulink>,
148 <ulink url="https://github.com/Haivision/srt">Srt</ulink>,
149 <ulink url="https://sourceforge.net/projects/schrodinger/">Schroedinger</ulink>,
150 <ulink url="https://www.twolame.org/">TwoLAME</ulink>,
151 <ulink url="https://sourceforge.net/projects/opencore-amr/files/vo-aacenc/">vo-aaenc</ulink>,
152 <ulink url="https://sourceforge.net/projects/opencore-amr/files/vo-amrwbenc/">vo-amrwbenc</ulink>,
153 <ulink url="https://vulkan.org/">Vulkan</ulink>, and
154 <ulink url="https://zapping.sourceforge.net/ZVBI/">ZVBI</ulink>
155 </para>
156
157 </sect2>
158
159 <sect2 role="installation">
160 <title>Installation of FFmpeg</title>
161
162 <para>
163 First, apply a patch that adds an API necessary for some packages to
164 build:
165 <!-- qtwebengine -->
166 </para>
167
168<screen><userinput remap="pre">patch -Np1 -i ../ffmpeg-&ffmpeg-version;-chromium_method-1.patch</userinput></screen>
169
170 <para>
171 Install <application>FFmpeg</application> by running the following
172 commands:
173 </para>
174
175<screen><userinput>./configure --prefix=/usr \
176 --enable-gpl \
177 --enable-version3 \
178 --enable-nonfree \
179 --disable-static \
180 --enable-shared \
181 --disable-debug \
182 --enable-libaom \
183 --enable-libass \
184 --enable-libfdk-aac \
185 --enable-libfreetype \
186 --enable-libmp3lame \
187 --enable-libopus \
188 --enable-libtheora \
189 --enable-libvorbis \
190 --enable-libvpx \
191 --enable-libx264 \
192 --enable-libx265 \
193 --enable-openssl \
194 --docdir=/usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
195
196make &amp;&amp;
197
198gcc tools/qt-faststart.c -o tools/qt-faststart</userinput></screen>
199
200 <para>
201 HTML documentation was built in the previous step. If you have
202 <xref linkend="texlive"/> installed and wish to build PDF and
203 Postscript versions of the documentation, issue the following commands:
204 </para>
205
206<screen remap="doc"><userinput>pushd doc &amp;&amp;
207for DOCNAME in `basename -s .html *.html`
208do
209 texi2pdf -b $DOCNAME.texi &amp;&amp;
210 texi2dvi -b $DOCNAME.texi &amp;&amp;
211
212 dvips -o $DOCNAME.ps \
213 $DOCNAME.dvi
214done &amp;&amp;
215popd &amp;&amp;
216unset DOCNAME</userinput></screen>
217
218 <para>
219 If you have <xref linkend="doxygen"/> installed
220 and you wish to build (if --disable-doc was
221 used) or rebuild the html documentation, issue:
222 </para>
223
224<screen remap="doc"><userinput>doxygen doc/Doxyfile</userinput></screen>
225
226 <para>
227 The fate-suite tests include comparisons with installed files, and should
228 not be run before the package is installed. Therefore, if you desire to
229 run them, instructions are given further below.
230 </para>
231
232 <para>
233 Now, as the <systemitem class="username">root</systemitem> user:
234 </para>
235
236<screen role="root"><userinput>make install &amp;&amp;
237
238install -v -m755 tools/qt-faststart /usr/bin &amp;&amp;
239install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
240install -v -m644 doc/*.txt /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
241
242 <para>
243 If the PDF and Postscript documentation was built, issue the following
244 commands, as the <systemitem class="username">root</systemitem> user, to
245 install them:
246 </para>
247
248<screen role="root"
249 remap="doc"><userinput>install -v -m644 doc/*.pdf /usr/share/doc/ffmpeg-&ffmpeg-version; &amp;&amp;
250install -v -m644 doc/*.ps /usr/share/doc/ffmpeg-&ffmpeg-version;</userinput></screen>
251
252 <para>
253 If you used <command>doxygen</command> to manually create the API
254 documentation, install it by issuing the following commands
255 as the <systemitem class="username">root</systemitem> user:
256 </para>
257
258<screen role="root"
259 remap="doc"><userinput>install -v -m755 -d /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
260cp -vr doc/doxy/html/* /usr/share/doc/ffmpeg-&ffmpeg-version;/api &amp;&amp;
261find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type f -exec chmod -c 0644 \{} \; &amp;&amp;
262find /usr/share/doc/ffmpeg-&ffmpeg-version;/api -type d -exec chmod -c 0755 \{} \;</userinput></screen>
263
264 <para>
265 To properly test the installation you must have <xref linkend="rsync"/>
266 installed and follow the instructions for the <ulink
267 url="https://www.ffmpeg.org/fate.html"> FFmpeg Automated Testing
268 Environment</ulink> (FATE). First, about 1 GB of sample files used to
269 run FATE are downloaded with the command:
270 </para>
271
272<screen remap="test"><userinput>make fate-rsync SAMPLES=fate-suite/</userinput></screen>
273
274 <para>
275 The <filename class="directory">fate-suite</filename> directory is
276 created and the files are downloaded there. That command actually runs an
277 rsync command to obtain the sample files. You may want to compress and
278 keep this directory for testing again, for testing in another system,
279 or for when a new version of ffmpeg is released. Then, unpack the sample
280 files in the source directory, and run the <command>make fate-rsync
281 ...</command> command above to sync with the upstream repository. The
282 download size and time are drastically reduced by doing this. Estimated
283 values in "Package Information" do not include the download SBU. Some
284 samples may have been removed in newer versions, so in order to be sure
285 local and server fate samples are identical when you use previously
286 saved samples, run the following command:
287 </para>
288
289<screen role="nodump"><userinput>rsync -vrltLW --delete --timeout=60 --contimeout=60 \
290 rsync://fate-suite.ffmpeg.org/fate-suite/ fate-suite/</userinput></screen>
291
292 <para>
293 Next, execute FATE with the following commands (there are more than 3800
294 tests in the suite):
295 </para>
296
297<screen remap="test"><userinput>make fate THREADS=<replaceable>N</replaceable> SAMPLES=fate-suite/ | tee ../fate.log &amp;&amp;
298grep ^TEST ../fate.log | wc -l</userinput></screen>
299
300 <para>
301 where <replaceable>N</replaceable> is an integer,
302 <replaceable>N</replaceable> &le; number of cores in the system.
303 </para>
304
305 <para>
306 A successful run should return no errors or warnings, just a list of tests
307 and total amount at the end.
308 </para>
309
310 </sect2>
311
312 <sect2 role="commands">
313 <title>Command Explanations</title>
314
315 <para>
316 <command>sed -i ... configure</command>: This command adds the
317 <application>ALSA</application> library to the
318 <application>Flite</application> <envar>LDFLAGS</envar> variable and
319 enables the discovery of <application>Flite</application>.
320 </para>
321
322 <para>
323 <command>find ... ;</command>: Fixes permissions of documentation files
324 and directories.
325 </para>
326
327 <para>
328 <parameter>--enable-libfreetype</parameter>: Enables
329 <application>Freetype</application> support.
330 </para>
331
332 <para>
333 <parameter>--enable-gpl</parameter>: Enables the use of GPL code and
334 permits support for postprocessing, swscale and many other features.
335 </para>
336
337 <para>
338 <parameter>--enable-version3</parameter>: Enables the use of (L)GPL
339 version 3 code.
340 </para>
341
342 <para>
343 <parameter>--enable-nonfree</parameter>: Enables the use of nonfree code.
344 Note that the resulting libraries and binaries will be unredistributable.
345 </para>
346
347 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
348 href="../../xincludes/static-libraries.xml"/>
349
350 <para>
351 <parameter>--enable-shared</parameter>: Enables building shared
352 libraries, otherwise only static libraries are built and installed.
353 </para>
354
355 <para>
356 <parameter>--disable-debug</parameter>: Disables building debugging
357 symbols into the programs and libraries.
358 </para>
359
360 <para>
361 <parameter>--enable-libaom</parameter>: Enables AV1 audio and video
362 decoding via <filename class="libraryfile">libaom</filename>.
363 </para>
364
365 <para>
366 <parameter>--enable-libass</parameter>: Enables ASS/SSA subtitle format
367 rendering via <filename class="libraryfile">libass</filename>.
368 </para>
369
370 <para>
371 <option>--enable-libdrm</option>: Use this switch if
372 <xref linkend="libdrm"/> is installed to build the <quote>kmsgrab</quote>
373 input module which is useful for screen capturing or streaming.
374 </para>
375
376 <para>
377 <parameter>--enable-libfdk-aac</parameter>: Enables AAC audio encoding via
378 <filename class="libraryfile">libfdk-aac</filename>.
379 </para>
380
381 <para>
382 <parameter>--enable-libmp3lame</parameter>: Enables MP3 audio encoding
383 via <filename class="libraryfile">libmp3lame</filename>.
384 </para>
385
386 <para>
387 <parameter>--enable-libvorbis --enable-libtheora</parameter>: Enables
388 Theora video encoding via <filename
389 class="libraryfile">libvorbis</filename> and <filename
390 class="libraryfile">libtheora</filename>.
391 </para>
392
393 <para>
394 <parameter>--enable-libvorbis --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 <command>gcc tools/qt-faststart.c -o tools/qt-faststart</command>: This
436 builds the <command>qt-faststart</command> program which can modify
437 QuickTime formatted movies (<filename class="extension">.mov</filename>
438 or <filename class="extension">.mp4</filename>) so that the header
439 information is located at the beginning of the file instead of the end.
440 This allows the movie file to begin playing before the entire file has
441 been downloaded.
442 </para>
443
444 <note>
445 <para>
446 Support for most of the dependency packages requires using options
447 passed to the <command>configure</command> script. View the output
448 from <command>./configure --help</command> for complete information
449 about enabling dependency packages.
450 </para>
451 </note>
452
453 </sect2>
454
455 <sect2 role="content">
456 <title>Contents</title>
457
458 <segmentedlist>
459 <segtitle>Installed Programs</segtitle>
460 <segtitle>Installed Libraries</segtitle>
461 <segtitle>Installed Directories</segtitle>
462
463 <seglistitem>
464 <seg>
465 ffmpeg, ffplay, ffprobe, <!--ffserver,--> and qt-faststart
466 </seg>
467 <seg>
468 libavcodec.so, libavdevice.so, libavfilter.so,
469 libavformat.so, libavutil.so, libpostproc.so,
470 libswresample.so, and libswscale.so
471 </seg>
472 <seg>
473 /usr/include/libav{codec,device,filter,format,util},
474 /usr/include/libpostproc,
475 /usr/include/libsw{resample,scale},
476 /usr/share/doc/ffmpeg-&ffmpeg-version;, and
477 /usr/share/ffmpeg
478 </seg>
479 </seglistitem>
480 </segmentedlist>
481
482 <variablelist>
483 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
484 <?dbfo list-presentation="list"?>
485 <?dbhtml list-presentation="table"?>
486
487 <varlistentry id="ffmpeg-prog">
488 <term><command>ffmpeg</command></term>
489 <listitem>
490 <para>
491 is a command-line tool to convert video files, network streams and
492 input from a TV card to several video formats
493 </para>
494 <indexterm zone="ffmpeg ffmpeg-prog">
495 <primary sortas="b-ffmpeg">ffmpeg</primary>
496 </indexterm>
497 </listitem>
498 </varlistentry>
499
500 <varlistentry id="ffplay">
501 <term><command>ffplay</command></term>
502 <listitem>
503 <para>
504 is a very simple and portable media player using the
505 <filename>ffmpeg</filename> libraries and the SDL library
506 </para>
507 <indexterm zone="ffmpeg ffplay">
508 <primary sortas="b-ffplay">ffplay</primary>
509 </indexterm>
510 </listitem>
511 </varlistentry>
512
513 <varlistentry id="ffprobe">
514 <term><command>ffprobe</command></term>
515 <listitem>
516 <para>
517 gathers information from multimedia streams and prints it in a human
518 and machine-readable fashion
519 </para>
520 <indexterm zone="ffmpeg ffprobe">
521 <primary sortas="b-ffprobe">ffprobe</primary>
522 </indexterm>
523 </listitem>
524 </varlistentry>
525
526 <varlistentry id="qt-faststart">
527 <term><command>qt-faststart</command></term>
528 <listitem>
529 <para>
530 moves the index file to the front of quicktime (mov/mp4) videos
531 </para>
532 <indexterm zone="ffmpeg qt-faststart">
533 <primary sortas="b-qt-faststart">qt-faststart</primary>
534 </indexterm>
535 </listitem>
536 </varlistentry>
537
538 <varlistentry id="libavcodec">
539 <term><filename class="libraryfile">libavcodec.so</filename></term>
540 <listitem>
541 <para>
542 is a library containing the <application>FFmpeg</application> codecs
543 (both encoding and decoding)
544 </para>
545 <indexterm zone="ffmpeg libavcodec">
546 <primary sortas="c-libavcodec">libavcodec.so</primary>
547 </indexterm>
548 </listitem>
549 </varlistentry>
550
551 <varlistentry id="libavdevice">
552 <term><filename class="libraryfile">libavdevice.so</filename></term>
553 <listitem>
554 <para>
555 is the <application>FFmpeg</application> device handling library
556 </para>
557 <indexterm zone="ffmpeg libavdevice">
558 <primary sortas="c-libavdevice">libavdevice.so</primary>
559 </indexterm>
560 </listitem>
561 </varlistentry>
562
563 <varlistentry id="libavfilter">
564 <term><filename class="libraryfile">libavfilter.so</filename></term>
565 <listitem>
566 <para>
567 is a library of filters that can alter video or audio between the
568 decoder and the encoder (or output)
569 </para>
570 <indexterm zone="ffmpeg libavfilter">
571 <primary sortas="c-libavfilter">libavfilter.so</primary>
572 </indexterm>
573 </listitem>
574 </varlistentry>
575
576 <varlistentry id="libavformat">
577 <term><filename class="libraryfile">libavformat.so</filename></term>
578 <listitem>
579 <para>
580 is a library containing the file formats handling (mux and demux
581 code for several formats) used by <command>ffplay</command> as well
582 as allowing the generation of audio or video streams
583 </para>
584 <indexterm zone="ffmpeg libavformat">
585 <primary sortas="c-libavformat">libavformat.so</primary>
586 </indexterm>
587 </listitem>
588 </varlistentry>
589
590 <varlistentry id="libavresample">
591 <term><filename class="libraryfile">libavresample.so</filename></term>
592 <listitem>
593 <para>
594 is a library containing functions for resampling audio and video.
595 </para>
596 <indexterm zone="ffmpeg libavresample">
597 <primary sortas="c-libavresample">libavresample</primary>
598 </indexterm>
599 </listitem>
600 </varlistentry>
601
602 <varlistentry id="libavutil">
603 <term><filename class="libraryfile">libavutil.so</filename></term>
604 <listitem>
605 <para>
606 is the <application>FFmpeg</application> utility library
607 </para>
608 <indexterm zone="ffmpeg libavutil">
609 <primary sortas="c-libavutil">libavutil.so</primary>
610 </indexterm>
611 </listitem>
612 </varlistentry>
613
614 <varlistentry id="libpostproc">
615 <term><filename class="libraryfile">libpostproc.so</filename></term>
616 <listitem>
617 <para>
618 is the <application>FFmpeg</application> post processing library
619 </para>
620 <indexterm zone="ffmpeg libpostproc">
621 <primary sortas="c-libpostproc">libpostproc.so</primary>
622 </indexterm>
623 </listitem>
624 </varlistentry>
625
626 <varlistentry id="libswresample">
627 <term><filename class="libraryfile">libswresample.so</filename></term>
628 <listitem>
629 <para>
630 is the <application>FFmpeg</application> audio rescaling library,
631 it contains functions for converting audio sample formats
632 </para>
633 <indexterm zone="ffmpeg libswresample">
634 <primary sortas="c-libswresample">libswresample.so</primary>
635 </indexterm>
636 </listitem>
637 </varlistentry>
638
639 <varlistentry id="libswscale">
640 <term><filename class="libraryfile">libswscale.so</filename></term>
641 <listitem>
642 <para>
643 is the <application>FFmpeg</application> image rescaling library
644 </para>
645 <indexterm zone="ffmpeg libswscale">
646 <primary sortas="c-libswscale">libswscale.so</primary>
647 </indexterm>
648 </listitem>
649 </varlistentry>
650
651 </variablelist>
652
653 </sect2>
654
655</sect1>
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