Author: igor
Date: Wed Oct 9 02:29:36 2013
New Revision: 11945
Log:
clarify chosen ffmpeg configure switches
Modified:
trunk/BOOK/multimedia/videoutils/ffmpeg.xml
Modified: trunk/BOOK/multimedia/videoutils/ffmpeg.xml
==============================================================================
--- trunk/BOOK/multimedia/videoutils/ffmpeg.xml Tue Oct 8 14:42:43 2013
(r11944)
+++ trunk/BOOK/multimedia/videoutils/ffmpeg.xml Wed Oct 9 02:29:36 2013
(r11945)
@@ -256,16 +256,6 @@
</para>
<para>
- <command>gcc tools/qt-faststart.c -o tools/qt-faststart</command>:
- This builds the <command>qt-faststart</command> program which can
- modify QuickTime formatted movies
- (<filename class="extension">.mov</filename> or
- <filename class="extension">.mp4</filename>) so that the header
information
- is located at the beginning of the file instead of the end. This allows
- the movie file to begin playing before the entire file has been
downloaded.
- </para>
-
- <para>
<parameter>--enable-gpl</parameter>: Enables the use of GPL code and
permits support for postprocessing, swscale and many other features.
</para>
@@ -300,40 +290,37 @@
</para>
<para>
- <parameter>--enable-libfdk-aac</parameter>: Enables AAC format
de/encoding
- via <filename class="libraryfile">libfdk-aac</filename>.
+ <parameter>--enable-libfdk-aac</parameter>: Enables currently the
+ highest-quality AAC audio encoding via <filename
+ class="libraryfile">libfdk-aac</filename>.
</para>
<para>
- <parameter>--enable-libmp3lame</parameter>: Enables MP3 de/encoding via
+ <parameter>--enable-libmp3lame</parameter>: Enables MP3 audio encoding
via
<filename class="libraryfile">libmp3lame</filename>.
</para>
<para>
- <parameter>--enable-libopus</parameter>: Enables Opus format de/encoding
- via <filename class="libraryfile">libopus</filename>.
+ <parameter>--enable-libopus</parameter>: Enables Opus encoding for low
+ latency streaming via <filename class="libraryfile">libopus</filename>.
</para>
<para>
- <parameter>--enable-libtheora</parameter>: Enables
- <application>Theora</application> de/encoding
- via <filename class="libraryfile">libtheora</filename>.
+ <parameter>--enable-libvorbis --enable-libtheora</parameter>: Enables
+ Theora video encoding via <filename
+ class="libraryfile">libvorbis</filename> and <filename
+ class="libraryfile">libtheora</filename>.
</para>
<para>
- <parameter>--enable-libvorbis</parameter>: Enables
- <application>Vorbis</application> de/encoding
- via <filename class="libraryfile">libvorbis</filename>.
+ <parameter>--enable-libvorbis --enable-libvpx</parameter>: Enables WebM
+ encoding via <filename class="libraryfile">libvorbis</filename> and
+ <filename class="libraryfile">libvpx</filename>.
</para>
<para>
- <parameter>--enable-libvpx</parameter>: Enables VP8 de/encoding
- via <filename class="libraryfile">libvpx</filename>.
- </para>
-
- <para>
- <parameter>--enable-libx264</parameter>: Enables H.264 de/encoding
- via <filename class="libraryfile">libx264</filename>.
+ <parameter>--enable-libx264</parameter>: Enables high-quality
H.264/MPEG-4
+ AVC encoding via <filename class="libraryfile">libx264</filename>.
</para>
<para>
@@ -341,20 +328,24 @@
</para>
<para>
- Support for most of the dependency packages requires using options passed
- to the <command>configure</command> script. View the the output from
- <command>./configure --help</command> for complete information about
- enabling dependency packages. The only reason to enable a specific codec
- (and make <application>FFmpeg</application> link to the prerequisite
- shared library installed on your system) is to make
- <application>FFmpeg</application> compile an <emphasis>encoder</emphasis>
- and/or <emphasis>decoder</emphasis> for that codec. If you just want to
- use <application>FFmpeg</application> to watch video or listen to music
- (via other applications such as <application>Gstreamer</application> or
- <application>Xine</application>) then you will not benefit from linking
- <application>FFmpeg</application> to other codec libraries.
+ <command>gcc tools/qt-faststart.c -o tools/qt-faststart</command>:
+ This builds the <command>qt-faststart</command> program which can
+ modify QuickTime formatted movies
+ (<filename class="extension">.mov</filename> or
+ <filename class="extension">.mp4</filename>) so that the header
information
+ is located at the beginning of the file instead of the end. This allows
+ the movie file to begin playing before the entire file has been
downloaded.
</para>
+ <note>
+ <para>
+ Support for most of the dependency packages requires using options
+ passed to the <command>configure</command> script. View the the output
+ from <command>./configure --help</command> for complete information
+ about enabling dependency packages.
+ </para>
+ </note>
+
</sect2>
<sect2 role="configuration">
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