On Mon, 4 Apr 2005, chris wrote:
> i'm trying to create a dvd video with an lpcm
> soundtrack that has a sample size of 24 bits and a
> sample frequency of 48 kHz. when i run mplex:
>
> mplex -f 8 -L 48000:2:24 -o sample2448.mpg movie.m2v
> sample2448.wav
>
> INFO: [mplex] mplex version 1.6.2 (2.2.3 $Date:
> 2004/01/13 20:45:26 $)
> INFO: [mplex] File black.m2v looks like an MPEG
> Video stream.
> **ERROR: [mplex] File unrecogniseable!
> **ERROR: [mplex] Unrecogniseable file(s)... exiting.
> are there problems with mplex and lpcm audio? if so,
No, there are not any known problems if you give mplex a lpcm audio
file.
There are problems with a WAV files though. Strip off the WAV header
and produce a 'raw' LPCM file and it will work.
Granted, mplex probably _should_ see that it's a wav file and get the
information it needs from that rather than the command line.
'sox' will produce "raw" output.
> soundtrack for dvd movies can be a number of formats,
> including lpcm in 16, 20 and 24 bits at 48 or 96 kHz.
> is there a transformation that needs to happen on a
> standard wav file to convert to lpcm first? my source
Yes, something like
sox input.wav sox.raw
might do the trick - but check the manpage first ;)
Most of the time folks are trying to squeeze as much playing time as
possible onto a disc so uncompressed audio is not frequently used.
384Kb/s AC3 should be enough for all but the most 'golden ears' ;)
Cheers,
Steven Schultz
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