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

[James Lancaster]

On Sunday 09 November 2003 16:17, you wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
>
> Hi,
>
> 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've tested this on mplayer 1.0 and 0.92 with my
> 2.4.18 kernel using Debian Woody. The soundcard is a
> C-Media CM8738 on-board chip, and I have a bt878 TV
> adapter.
>

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

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.)

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

http://kirk.math.twsu.edu/family/james/system.html

>
> --Timo
>
> 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)

>
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