[MPlayer-users] high-pitched sound during mencoder recordings

[Timo Reimann]

> > I'm having some trouble with the audio quality of
> my
> > TV recordings produced with mencoder.
> >
> > When I use mencoder to watch TV regularly, the
> sound
> > is perfect but when I play recordings I've made
> they
> > all have a distinct high-pitched sound throughout
> the
> > video. Apart from that, the audio part is ok but
> the
> > high-pitched tone is just bothering.
> >
> > Any idae what might be causing this?

> I believe it is interference, but I can't be sure.
> It happens with both 
> mythtv and mencoder (and others) 

Yeah I've tested it on nvrec using nuppelrec - same
problem.

> I will reccomend audacity for cleaning this up (the
> noise removal tool, 
> select a small section, then "get noise profile" and
> then select all of the 
> audio, and chose remove noise.)

The tool seems to work, but I need something more
automatic. I've found a way to dump the audio stream
to a file, yet I need to find a tool that let's me
denoise on the console. Besides, I haven't found a way
to reinsert audio stream into a video file using
mencoder without having to reencode. :(

> unfortuantely we don't yet have -af denoise that
> fixes it magicly :(

I could live with that if I was able to do the noise
reduction fully automatically and without quality loss
(that is: I don't want to re-encode).

> > PS: Anyone managed to use the btaudio.o module
> from
> > the kernel with mencoder? I haven't been
> successful
> > with any /dev/dsp? device other than /dev/dsp.
> Hints
> > concerning this are welcome as well!
> 
> yes, add to mplayer/mencoder  in the -tv section
> adevice=/dev/dspX (for me 
> only the analog work, digital doesn't) and for
> mplayer you will need to add 
> immediatemode=0 (mencoder's default)

Tried that, I think it's not working appropriately on
my box. According to the btaudio documentation, the
driver sets up another device at /dev/dspX which can
be used. I insmod'ed btaudio with 'analog=1' and
probed all dspX's: dsp worked as usual, dsp1 made
mencoder run weird and stopable only via kill -9, dsp2
and -3 didn't output any sound at all.
Is this normal? What other switches did you apply to
the module?

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