mirror of https://github.com/mpv-player/mpv
Some updates and rewordings as well as a much better table design by
Nilmoni Deb, Daniel Carter and Philip Jägenstedt. git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@9083 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
diego
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DOCS/sound.html
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DOCS/sound.html
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@ -22,7 +22,7 @@
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<DD>OSS (ioctl) driver (supports hardware AC3 passthrough)</DD>
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<DT>sdl</DT>
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<DD>SDL driver (supports <B>ESD</B>, <B>ARTS</B> etc)</DD>
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<DD>SDL driver (supports sound daemons like <B>ESD</B> and <B>ARTS</B>)</DD>
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<DT>nas</DT>
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<DD>NAS (Network Audio System) driver</DD>
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@ -43,18 +43,21 @@
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<DD>native ESD driver (mostly for GNOME users)</DD>
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</DL>
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<P>Fact is, Linux sound card drivers have compatibility problems. The cause
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is that MPlayer uses a feature that well coded audio drivers implement to
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maintain audio/video sync. Regrettably, some driver authors do not care about
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this function, it is not needed for playing MP3s or for sound effects.</P>
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<P>Linux sound card drivers have compatibility problems. This is because MPlayer
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relies on an in-built feature of <EM>properly</EM> coded sound drivers that
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enable them to maintain correct audio/video sync. Regrettably, some driver
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authors don't take the care to code this feature since it is not needed for
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playing MP3s or sound effects. </P>
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<P>Other media players like aviplay or xine possibly work out-of-the-box with
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these drivers because they use "simple" methods with internal timing. A note:
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time showed their methods aren't AS efficient as MPlayer's.</P>
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<P>With a correctly written audio driver MPlayer will never create audio related
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A/V desynchronisation, unless your file is badly broken. Some options to work
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around these problems are described in the man page).</P>
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<P>Other media players like <A HREF="http://avifile.sourceforge.net">aviplay</A>
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or <A HREF="http://xine.sourceforge.net">xine</A> possibly work
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out-of-the-box with these drivers because they use "simple" methods with
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internal timing. Measuring showed that their methods are not as efficient
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as MPlayer's. </P>
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<P>Using MPlayer with a properly written audio driver will never result
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in A/V desyncs related to the audio, except only with very badly created
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files (check the man page for workarounds).</P>
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<P>If you happen to have a bad audio driver, try the <CODE>-autosync</CODE>
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option, it should sort out your problems. See the man page for detailed
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@ -67,94 +70,160 @@
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default). If you experience glitches, halts or anything out of the
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ordinary, try <CODE>-ao sdl</CODE> (NOTE: You need to have SDL libraries
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and header files installed). The SDL audio driver helps in a lot of cases
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and also supports ESD and ARTS. (ESD is the sound daemon
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from GNOME, ARTS is from KDE.)</LI>
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and also supports ESD (GNOME) and ARTS (KDE).</LI>
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<LI>If you have ALSA version 0.5, then you almost always have to use
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<CODE>-ao alsa5</CODE> , since ALSA 0.5 has buggy OSS emulation code, and
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will <B>crash MPlayer</B> with a message like this:<BR>
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<CODE>DEMUXER: Too many (945 in 8390980 bytes) video packets in the buffer!</CODE></LI>
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</UL>
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<P>On <B>Solaris</B>, use the SUN audio driver with the
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<CODE>-ao sun</CODE> option, otherwise neither video nor audio will work.</P>
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<LI>On Solaris, use the SUN audio driver with the <CODE>-ao sun</CODE> option,
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otherwise neither video nor audio will work.</LI>
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<LI>If the sound clicks when playing from CD-ROM, turn on IRQ unmasking, e.g.
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<CODE>hdparm -u1 /dev/cdrom</CODE> (<CODE>man hdparm</CODE>). This is
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generally beneficial and described in more detail in the
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<A HREF="cd-dvd.html#drives">CD-ROM section</A>.</LI>
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</UL>
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<H4><A NAME="experiences">2.3.2.2 Sound Card experiences, recommendations</A></H4>
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<TABLE BORDER="0" WIDTH="100%">
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<TR><TD COLSPAN=3><B>VIA onboard chipset (via82cxxx) 48kHz only</B></TD></TR>
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<TR><TD></TD><TD>Driver:</TD><TD> from the
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<A HREF="http://sourceforge.net/project/showfiles.php?group_id=3242&release_id=59602">gkernel project</A></TD></TR>
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<TR><TD COLSPAN=3><B>Aureal Vortex 2</B></TD></TR>
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<TR><TD> </TD><TD>OSS:</TD><TD>no driver</TD></TR>
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<TR><TD></TD><TD>OSS/Pro:</TD><TD>OK</TD></TR>
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<TR><TD></TD><TD>ALSA:</TD><TD>no driver</TD></TR>
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<TR><TD></TD><TD>Max kHz:</TD><TD>48</TD></TR>
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<TR><TD></TD><TD>Driver:</TD><TD><A HREF="http://aureal.sourceforge.net">aureal.sourceforge.net</A></TD></TR>
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<TR><TD></TD><TD>Driver2:</TD><TD> from <A HREF="http://makacs.poliod.hu/~pontscho/aureal/au88xx-1.1.3.tar.bz2">Pontscho's page</A>
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(<I>buffer size increased to 32k</I>)</TD></TR>
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<TR><TD COLSPAN=3><B>GUS PnP</B></TD></TR>
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<TR><TD></TD><TD>OSS:</TD><TD>no driver</TD></TR>
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<TR><TD></TD><TD>OSS/Pro:</TD><TD>OK</TD></TR>
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<TR><TD></TD><TD>ALSA:</TD><TD>OK</TD></TR>
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<TR><TD></TD><TD>Max kHz:</TD><TD>48</TD></TR>
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<TR><TD COLSPAN=3><B>SB Live!</B></TD></TR>
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<TR><TD></TD><TD>OSS:</TD><TD>Analog OK, SP/DIF not working</TD></TR>
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<TR><TD></TD><TD>ALSA:</TD><TD>Both OK</TD></TR>
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<TR><TD></TD><TD>Max kHz:</TD><TD>192</TD></TR>
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<TR><TD COLSPAN=3><B>SB AWE 64</B></TD></TR>
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<TR><TD></TD><TD>OSS:</TD><TD>max 44kHz</TD></TR>
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<TR><TD></TD><TD>ALSA:</TD><TD>48kHz sounds bad</TD></TR>
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<TR><TD></TD><TD>Max kHz:</TD><TD>48</TD></TR>
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<TR><TD COLSPAN=3><B>Gravis UltraSound ACE</B></TD></TR>
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<TR><TD></TD><TD>OSS:</TD><TD>not OK</TD></TR>
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<TR><TD></TD><TD>ALSA:</TD><TD>OK</TD></TR>
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<TR><TD></TD><TD>Max kHz:</TD><TD>44</TD></TR>
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<TR><TD COLSPAN=3><B>Gravis UltraSound MAX</B></TD></TR>
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<TR><TD></TD><TD>OSS:</TD><TD>OK</TD></TR>
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<TR><TD></TD><TD>ALSA:</TD><TD>OK (?)</TD></TR>
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<TR><TD></TD><TD>Max kHz:</TD><TD>48</TD></TR>
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<TR><TD COLSPAN=3><B>ESS 688</B></TD></TR>
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<TR><TD></TD><TD>OSS:</TD><TD>OK</TD></TR>
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<TR><TD></TD><TD>ALSA:</TD><TD>OK (?)</TD></TR>
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<TR><TD></TD><TD>Max kHz:</TD><TD>48</TD></TR>
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<TR><TD COLSPAN=3><B>C-Media cards (which ones?)</B></TD></TR>
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<TR><TD></TD><TD>OSS:</TD><TD>not OK (hissing) (?)</TD></TR>
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<TR><TD></TD><TD>ALSA:</TD><TD>OK (?)</TD></TR>
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<TR><TD></TD><TD>Max kHz:</TD><TD>?</TD></TR>
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<TR><TD COLSPAN=3><B>Yamaha cards (*ymf*)</B></TD></TR>
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<TR><TD></TD><TD>OSS:</TD><TD>not OK (?) (maybe <CODE>-ao sdl</CODE>)</TD></TR>
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<TR><TD></TD><TD>ALSA:</TD><TD>OK only with ALSA 0.5 with OSS emulation <B>AND</B> <CODE>-ao sdl</CODE> (!) (?)</TD></TR>
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<TR><TD></TD><TD>Max kHz:</TD><TD>?</TD></TR>
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<TR><TD COLSPAN=3><B>Cards with envy24 chips (like Terratec EWS88MT)</B></TD></TR>
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<TR><TD></TD><TD>OSS:</TD><TD>?</TD></TR>
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<TR><TD></TD><TD>OSS/Pro:</TD><TD>OK</TD></TR>
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<TR><TD></TD><TD>ALSA:</TD><TD>?</TD></TR>
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<TR><TD></TD><TD>Max kHz:</TD><TD>?</TD></TR>
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<TR><TD COLSPAN=3><B>PC Speaker or DAC</B></TD></TR>
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<TR><TD></TD><TD>OSS:</TD><TD>OK (Use the SDL driver: <CODE>-ao sdl</CODE>)</TD></TR>
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<TR><TD></TD><TD>ALSA:</TD><TD>no driver</TD></TR>
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<TR><TD></TD><TD>Max kHz:</TD><TD>The driver emulates 44.1, maybe more.</TD></TR>
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<TR><TD></TD><TD>Driver:</TD><TD><A HREF="ftp://ftp.infradead.org/pub/pcsp">ftp://ftp.infradead.org/pub/pcsp</A></TD></TR>
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</TABLE>
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<P>On Linux, a 2.4.x kernel is highly recommended. Kernel 2.2 is not tested.</P>
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<P>If the sound clicks when playing from CD-ROM, turn on IRQ unmasking, e.g.
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<CODE>hdparm -u1 /dev/cdrom</CODE> (<CODE>man hdparm</CODE>). This is
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generally beneficial and described in more detail in the
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<A HREF="cd-dvd.html#drives">CD-ROM section</A>.</P>
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<P>Linux sound drivers are primarily provided by the free version of OSS. These
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drivers have been superceded by <A HREF="http://www.alsa-project.org">ALSA</A>
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(Advanced Linux Sound Architecture) in the 2.5 development series. If your
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distribution does not already use ALSA you may wish to try their drivers if
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you experience sound problems. ALSA drivers are generally superior to OSS in
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compatibility, performance and features. But some sound cards are only
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supported by the commercial OSS drivers from
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<A HREF="http://www.opensound.com/">4Front Technologies</A>. They also support
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several non-Linux systems.</P>
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<TABLE BORDER="1" WIDTH="100%">
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<TR>
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<TD ROWSPAN="2"><B>SOUND CARD</B></TD>
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<TD COLSPAN="4"><B>DRIVER</B></TD>
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<TD ROWSPAN="2"><B>Max kHz</B></TD>
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</TR>
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<TR>
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<TD><B>OSS/Free</B></TD>
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<TD><B>ALSA</B></TD>
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<TD><B>OSS/Pro</B></TD>
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<TD><B>other</B></TD>
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</TR>
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<TR>
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<TD><B>VIA onboard (686/A/B, 8233, 8235)</B></TD>
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<TD><A HREF="http://sourceforge.net/project/showfiles.php?group_id=3242&release_id=59602">via82cxxx_audio</A></TD>
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<TD>snd-via82xx</TD>
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<TD> </TD>
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<TD> </TD>
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<TD>4-48 kHz or 48 kHz only, depending on the chipset</TD>
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</TR>
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<TR>
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<TD><B>Aureal Vortex 2</B></TD>
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<TD>none</TD>
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<TD>none</TD>
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<TD>OK</TD>
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<TD><A HREF="http://aureal.sourceforge.net">Linux Aureal Drivers</A><BR>
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<A HREF="http://makacs.poliod.hu/~pontscho/aureal/au88xx-1.1.3.tar.bz2">buffer size increased to 32k</A></TD>
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<TD>48</TD>
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</TR>
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<TR>
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<TD><B>GUS PnP</B></TD>
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<TD>none</TD>
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<TD>OK</TD>
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<TD>OK</TD>
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<TD> </TD>
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<TD>48</TD>
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</TR>
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<TR>
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<TD><B>SB Live!</B></TD>
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<TD>Analog OK, SP/DIF not working</TD>
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<TD>Both OK</TD>
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<TD> </TD>
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<TD> </TD>
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<TD>192</TD>
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</TR>
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<TR>
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<TD><B>SB AWE 64</B></TD>
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<TD>max 44kHz</TD>
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<TD>48kHz sounds bad</TD>
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<TD> </TD>
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<TD> </TD>
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<TD>48</TD>
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</TR>
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<TR>
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<TD><B>Gravis UltraSound ACE</B></TD>
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<TD>not OK</TD>
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<TD>OK</TD>
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<TD> </TD>
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<TD> </TD>
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<TD>44</TD>
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</TR>
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<TR>
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<TD><B>Gravis UltraSound MAX</B></TD>
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<TD>OK</TD>
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<TD>OK (?)</TD>
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<TD> </TD>
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<TD> </TD>
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<TD>48</TD>
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</TR>
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<TR>
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<TD><B>ESS 688</B></TD>
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<TD>OK</TD>
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<TD>OK (?)</TD>
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<TD> </TD>
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<TD> </TD>
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<TD>48</TD>
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</TR>
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<TR>
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<TD><B>C-Media cards (which ones?)</B></TD>
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<TD>not OK (hissing) (?)</TD>
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<TD>OK (?)</TD>
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<TD> </TD>
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<TD> </TD>
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<TD>?</TD>
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</TR>
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<TR>
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<TD><B>Yamaha cards (*ymf*)</B></TD>
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<TD>not OK (?) (maybe <CODE>-ao sdl</CODE>)</TD>
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<TD>OK only with ALSA 0.5 with OSS emulation <B>AND</B>
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<CODE>-ao sdl</CODE> (!) (?)</TD>
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<TD> </TD>
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<TD> </TD>
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<TD>?</TD>
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</TR>
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<TR>
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<TD><B>Cards with envy24 chips (like Terratec EWS88MT)</B></TD>
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<TD>?</TD>
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<TD>?</TD>
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<TD>OK</TD>
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<TD> </TD>
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<TD>?</TD>
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</TR>
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<TR>
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<TD><B>PC Speaker or DAC</B></TD>
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<TD>OK (Use the SDL driver: <CODE>-ao sdl</CODE>)</TD>
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<TD>none</TD>
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<TD> </TD>
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<TD><A HREF="http://www.geocities.com/stssppnn/pcsp.html">Linux PC speaker OSS driver</a></TD>
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<TD>The driver emulates 44.1, maybe more.</TD>
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</TR>
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</TABLE>
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<P>Feedback to this document is welcome. Please tell us how MPlayer
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and your sound card(s) worked together.</P>
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@ -474,7 +543,7 @@
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<DL>
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<DT><CODE>g1:g2:g3...g10</CODE></DT>
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<DD>are floating point numbers between <CODE>-12<CODE> and <CODE>+12</CODE>
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<DD>are floating point numbers between <CODE>-12</CODE> and <CODE>+12</CODE>
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representing the gain in dB for each frequency band.</DD>
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</DL>
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@ -591,8 +660,8 @@
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<H4><A NAME="plugins">2.3.2.4 Audio plugins (deprecated)</A></H4>
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<P>MPlayer has support for audio plugins. Audio plugins can be used for
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changing the properties of the audio data before the sound reaches the sound
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<P>MPlayer has support for audio plugins. Audio plugins can be used to
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change the properties of the audio data before it reaches the sound
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card. They are enabled using the <CODE>-aop</CODE> switch which takes a
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<CODE>list=plugin1,plugin2,...</CODE> argument. The <CODE>list</CODE> argument
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is required and determines which plugins should be used and in which order they
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@ -614,7 +683,7 @@
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<P>would set the output frequency of the resample plugin to 44100Hz and the
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output format of the format plugin to AFMT_U8.</P>
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<P>Currently audio plugins can not be used in MEncoder.</P>
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<P>Currently audio plugins cannot be used in MEncoder.</P>
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<H5><A NAME="resample">2.3.2.4.1 Up/Downsampling</A></H5>
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@ -622,11 +691,10 @@
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<P>MPlayer fully supports up/downsampling of the sound. This plugin can
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be used if you have a fixed frequency sound card or if you are
|
||||
stuck with an old sound card that is only capable of max 44.1kHz.
|
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Whether is usage of this plugin is necessary or not, is <B>autodetected</B>.
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This plugin has one switch:
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<CODE>fout</CODE> which is used for setting the desired output sample
|
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frequency. It defaults to 48kHz, and is given in
|
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<Hz>.</P>
|
||||
MPlayer <EM>autodetects</EM> whether or not usage of this plugin is necessary.
|
||||
This plugin has one switch, <CODE>fout</CODE>, which is used for setting the
|
||||
desired output sample frequency. The value is given in Hz, and defaults to
|
||||
48kHz.</P>
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||||
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||||
<P>Usage:<BR>
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||||
<CODE>mplayer media.avi -aop list=resample:fout=<required
|
||||
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@ -634,7 +702,7 @@
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|||
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||||
<P>Note that the output frequency should not be scaled up from the default value.
|
||||
Scaling up will cause the audio and video streams to be played in slow motion
|
||||
in addition to audio distortion.</P>
|
||||
and cause audio distortion.</P>
|
||||
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||||
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||||
<H5><A NAME="surround_decoding">2.3.2.4.2 Surround Sound decoding</A></H5>
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@ -670,6 +738,10 @@
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and is mentioned here for the sake of completeness only. Do not use this
|
||||
plugin unless you are a developer.</P>
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||||
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<P>If you have a file with a consistent A/V sync fault, use the <CODE>+/-</CODE>
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keys to adjust timings on-the-fly instead. Usage of the OSD is recommended
|
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to make this easier.</P>
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<H5><A NAME="volume">2.3.2.4.5 Software volume control</A></H5>
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Loading…
Reference in New Issue