[MPlayer-dev-eng] [PATCH] Audio filter docs for sound.html
Anders Johansson
ajh at watri.uwa.edu.au
Sat Jan 4 07:13:48 CET 2003
> Anders Johansson writes:
> > Attached is a patch documenting the audio filters.
>
> Very nice, thanks a million.
>
> > BTW: The docs are a bit harder to read nowadays. I don't think it was
> > a good idea to put all docs in the man page, they are not detailed
> > enough (due to the space limitation), also it is hard to find a
> > specific switch unless one knows exactly what to look for. Wouldn't it
> > be better to use some other more advanced documentation tool, that can
> > produce may different types of documents like for example
> > http://docbook.sourceforge.net/.
>
> > + <LI><CODE>bps</CODE> is and integer 1, 2 or 4 and denotes the number
> > + of bytes per sample. This switch is required, leaving it empty
> > + results in a runtime error. </LI>
>
> I take this that bps can be 1,2 or 4, right?
Yes.
> > + <LI><CODE>l00:l01:l02:..l10:l11:l12:...ln0:ln1:ln2:...</CODE> are
> > + floating point values between 0 and 1 that determines the level
> > + <CODE>l[i][j]</CODE> that the input channel j is mixed into output
> > + channel i.</LI>
>
> I tried hard to understand this, but I could not.. Could you try to
> explain this again? Here it is again in a more readable form:
>
> l00:l01:l02:..l10:l11:l12:...ln0:ln1:ln2:...
> are floating point values between 0 and 1 that determine the level
> l[i][j] that the input channel j is mixed into output channel i.
>
> Example:
> mplayer -af pan=1:0.5:0.5 -channels 1 media.avi
>
> Now that I have pondered it a bit, I think I know what you meant. I
> hope my version is a little bit clearer:
>
> l00:l01:l02:..l10:l11:l12:...ln0:ln1:ln2:...
> are floating point values between 0 and 1. l[i][j] determines how
> much of input channel j is mixed into output channel i.
Yes, it is better, perhaps one more example would clarify things even
more:
Example2:
mplayer -af pan=6:1:0:1:0.5:0.5 -channels 3 media.avi
would give 3 channel output leaveing channels 0 and 1 intact, and mix
channels 0 and 1 into output channel 3 (which could be sent to a
sub-woofer for example).
> Diego
//Anders
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