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On Sunday 22 Aug 2004 19:52, Steven M. Schultz wrote:
> On Sun, 22 Aug 2004, Anne Wilson wrote:
> > So, if I'd used -f 8 I didn't need a -b setting at all?
>
>       Close, but not quite.
>
>       If you specify '-b' to mpeg2enc then it is likely that you'll also
>       need to specify '-r' to mplex and take into account the audio plus
>       overhead.
>
>       As was mentioned earlier you probably want to be using '-f 8' anyhow
>       if the end result is going to be a DVD disc.
>
Yes, I've changed my notes to reflect that.

> > OK, I tried that, but the sound is still hopelessly wrong.  In the avi it
> > played with just one small hicough near the beginning, but otherwise
> > faultlessly.  This is coughing and spluttering all over the place!  Any
> > ideas?
>
>       If you're using MPlayer to play the output of mplex then it is possible
>       that you're encountering the probley with the default MP2/3 audio
>       decoding.   Some versions of gcc miscompile part of mplayer and the
>       symptom is corrupted audio playback.   

I don't think I'm using mplayer.  I played it back in both xine and totem.  I 
don't know what mechanism they use for sound, but I used to use xine without 
mplayer installed, so I assume not.

>       The workaround is to use 
>       '-ac mad' (assuming  you've built mplayer with the libmad routines
>       from http://www.underbit.com/products/mad/
>
Mplayer is the standard Mandrake distro version, IIRC.  I'll have to read up 
on that.

>       Hmmm, does the .wav file play correctly 

Remember that I built the wav first, then added it to the avi.  It played 
fine, both alone and in the avi.

>       and is it at a 48000 sampling 
>       rate (which is required for DVD)?  I think mp2enc will automatically
>       downsample to 44100 unless told otherwise - and 44100 is not valid
>       for a DVD.
>
That looks like it -

 INFO: [mplex] MPEG AUDIO STREAM: c0
   INFO: [mplex] Audio version  : 1.0
   INFO: [mplex] Layer          :        2
   INFO: [mplex] CRC checksums  :       no
   INFO: [mplex] Bit rate       :    28672 bytes/sec (224 kbit/sec)
   INFO: [mplex] Frequency      :     44100 Hz
   INFO: [mplex] Mode           :        0 stereo

The man page for mpeg2enc gives a huge number of parameters, but none look to 
be relevant, unless just setting -f 8 takes care of it?

Anne
- -- 
Registered Linux User No.293302
Have you visited http://twiki.mdklinuxfaq.org yet?
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