On Sun, 21 Mar 2004, Boris Shingarov wrote:
> Can mplex include an uncompressed PCM stream?
Yes, it can.
> I tried
> mplex -f 8 -o birthday1.mpg birthday1.mpv birthday1.pcm
> but mplex says 'Unrecognised format'.
It is necessary to use the "-L" (or --lpcm-params) option and
specify the characteristics of the audio file.
from the mplex manpage:
-L|--lpcm-params
samples_per_sec:channels:bits_per_sample
[, samples_per_sec:channels:bits_per_sample
A comma-seperated list of paramter sets for the
lpcm audio streams (given in the order the lpcm
streams appear on the command line). Each parame-
ter set comprises the sampling rate in Hz, the num-
ber of channels, and the number of bits per sample
seperated by colons. For example, the default
48kHz two-channel 16-bit audio would be specified
as 48000:2:16.
Note: these parameters are necessary because mplex
expects raw LPCM audio data without any headers.
That is: for each sample point a group of 16,20, or
24 bit amplitude values, one for each channel.
Amplitude values are signed with the constituent
bytes in big-endian (most significant bytes first)
order.
> I tried wrapping it into wav so mplex could look at the riff header, but the
> result is the same. In the man page I read that "mplex can take ac3 and
> mp2". Is this right, and it doesn't know anything about pcm?
What version of mplex are you using? If the manpage does not have
the paragraphs above then the version of mplex is too old - upgrading
to a newer version of mjpegtools will solve the problem you are
having.
It would be nice if mplex did understand .wav files and obtained the
necessary information automatically but at the present time that is
not how mplex works.
The PCM data has to be in big-endian format and for DVDs must be at
the 48k sampling rate.
Cheers,
Steven Schultz
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