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Diffstat (limited to 'DOCS/sound.html')
| -rw-r--r-- | DOCS/sound.html | 46 |
1 files changed, 30 insertions, 16 deletions
diff --git a/DOCS/sound.html b/DOCS/sound.html index 23acb250b6..828aa959fa 100644 --- a/DOCS/sound.html +++ b/DOCS/sound.html @@ -12,6 +12,8 @@ <H3><A NAME="audio">2.3.2 Audio output devices</A></H3> +<H4><A NAME="sync">2.3.2.1 Description of MPlayer's A/V sync method</A></H4> + <P>MPlayer's audio interface is called <I>libao2</I>. It currently contains these drivers:</P> @@ -26,8 +28,24 @@ <TR><TD></TD><TD VALIGN=top>arts</TD><TD></TD><TD>native ARTS driver (mostly for KDE users)</TD></TR> </TABLE> -<P>Fact is, Linux sound card drivers have compatibility problems. - It <B>may</B> take a while to find your optimal settings.</P> +<P>Fact is, Linux sound card drivers have compatibility problems. The cause + is that MPlayer uses a feature of normally coded audio drivers to maintain + audio/video sync. Regrettably, some driver authors don't care of this + function: it isn't needed for playing MP3s, or sound effects.</P> + +<P>Other media players like aviplay or xine possibly work out-of-the-box with + these drivers because they use "simple" methods with internal timing. A note: + time showed their methods aren't AS efficient as MPlayer's.</P> + +<P>Using MPlayer with a correctly written audio driver won't ever give you A/V + desyncs related to the audio, only with very badly created files (check the + documentation for workarounds!).</P> + +<P>If you happen to have a bad audio driver, try the <CODE>-autosync</CODE> + option, it should sort out your problems. See the man page for detailed + information.</P> + +<P>Some notes:</P> <UL> <LI>If you have an OSS driver, first try <CODE>-ao oss</CODE> (this is the @@ -40,17 +58,13 @@ <CODE>-ao alsa5</CODE> , since ALSA 0.5 has buggy OSS emulation code, and will <B>crash MPlayer</B> with a message like this:<BR> <CODE>DEMUXER: Too many (945 in 8390980 bytes) video packets in the buffer!</CODE></LI> - <LI>If you have ALSA version 0.9 you may choose between <CODE>-ao oss</CODE> - and <CODE>-ao sdl</CODE>. You can also use <CODE>-ao alsa9</CODE>. It - works, but there may be problems like lost sync and disappearing - audio.</LI> </UL> -<P>On <B>Solaris/FreeBSD</B> systems, use the SUN audio driver with the +<P>On <B>Solaris</B>, use the SUN audio driver with the <CODE>-ao sun</CODE> option, otherwise neither video nor audio will work.</P> -<H4><A NAME="experiences">2.3.2.1 Sound Card experiences, recommendations</A></H4> +<H4><A NAME="experiences">2.3.2.2 Sound Card experiences, recommendations</A></H4> <TABLE BORDER=0 WIDTH="100%"> <TR><TD COLSPAN=3><B>VIA onboard chipset (via82cxxx) 48kHz only</B></TD></TR> @@ -136,7 +150,7 @@ and your sound card(s) worked together.</P> -<H4><A NAME="plugins">2.3.2.2 Audio plugins</A></H4> +<H4><A NAME="plugins">2.3.2.3 Audio plugins</A></H4> <P>MPlayer has support for audio plugins. Audio plugins can be used for changing the properties of the audio data before the sound reaches the sound @@ -164,7 +178,7 @@ <P>Currently audio plugins can not be used in MEncoder.</P> -<H5><A NAME="resample">2.3.2.2.1 Up/Downsampling</A></H5> +<H5><A NAME="resample">2.3.2.3.1 Up/Downsampling</A></H5> <P>MPlayer fully supports up/downsampling of the sound. This plugin can be used if you have a fixed frequency sound card or if you are @@ -184,7 +198,7 @@ in addition to audio distortion.</P> -<H5><A NAME="surround_decoding">2.3.2.2.2 Surround Sound decoding</A></H5> +<H5><A NAME="surround_decoding">2.3.2.3.2 Surround Sound decoding</A></H5> <P>MPlayer has an audio plugin that can decode matrix encoded surround sound. Dolby Surround is an example of a matrix encoded format. @@ -195,7 +209,7 @@ <CODE>mplayer media.avi -aop list=surround</CODE></P> -<H5><A NAME="format">2.3.2.2.3 Sample format converter</A></H5> +<H5><A NAME="format">2.3.2.3.3 Sample format converter</A></H5> <P>If your sound card driver does not support signed 16bit <CODE>int</CODE> data type, this plugin can @@ -210,7 +224,7 @@ list=format:format=<required output format></CODE></P> -<H5><A NAME="delay">2.3.2.2.4 Delay</A></H5> +<H5><A NAME="delay">2.3.2.3.4 Delay</A></H5> <P>This plugin delays the sound and is intended as an example of how to develop new plugins. It can not be used for anything useful from a users perspective @@ -218,7 +232,7 @@ plugin unless you are a developer.</P> -<H5><A NAME="volume">2.3.2.2.5 Software volume control</A></H5> +<H5><A NAME="volume">2.3.2.3.5 Software volume control</A></H5> <P>This plugin is a software replacement for the volume control, and can be used on machines with a broken mixer device. It can also be @@ -251,7 +265,7 @@ list=volume:softclip</CODE></P> -<H5><A NAME="extrastereo">2.3.2.2.6 Extrastereo</A></H5> +<H5><A NAME="extrastereo">2.3.2.3.6 Extrastereo</A></H5> <P>This plugin (linearly) increases the difference between left and right channels (like the XMMS extrastereo plugin) which gives some sort of "live" @@ -267,7 +281,7 @@ -1.0, left and right channels will be swapped.</P> -<H5><A NAME="normalizer">2.3.2.2.7 Volume normalizer</A></H5> +<H5><A NAME="normalizer">2.3.2.3.7 Volume normalizer</A></H5> <P>This plugin maximizes the volume without distorting the sound.</P> |