[Toolame-devel] Re: Mp2 in a .wav file format and parallel encoding

[Jesse S. <sc...@gm...>]

To answer my own question, and scold myself, www.cartchunk.org has a
nice little app called waveview that can view .wav file header
information from prophet system's output.  I found this in a thread in
this very mailing list, imagine that!!!.  I'm still slogging through
to find info on parallel output, and mp2 input however.

On Thu, 29 Jul 2004 17:50:47 -0400, Jesse Schoch <sc...@gm...> wrote:
> Firstly, I have very little C programming experience, and very little
> experience with audio.  I do have a good background in java, *nix, and
> perl, so please forgive me if these questions are obvious and please
> let me know if there is a better forum in which to ask.
> 
> I have a requirement to do some encoding from .wav file that is
> encoded in a .wav format to several outputs:
>     .mp2 (mpeg audio layer 2 256Kbit/s CBR)
>     .wav (mpeg 2 same CBR and bitrate)
>     .mp3 (I can use lame for this).
> 
> Xdelta shows that there is only a very small difference between the
> .wav and .mp2 files, I assume only the frame headers. and the id3 tag
> 
> The source file is from a proprietary format (Prophet Systems) which
> has the .wav file, a ASCII .dat file containing track information, and
> a binary .vid file.  I have no clue what the .vid file is, and I'd
> very much like to know.  Our current process uses 3rd party software
> that takes the .wav and serialy processes the different outputs.
> 
> What I'd like to know is
> 
> 1.  How can I figure out what format the source file is.  Is there a
> header reader out there I can download and compile?  I've read the
> specs on the MPEG frame header, but I don't have much experience
> dealing with binary file formats.
> 
> 2.  Can I process 1 frame of the input file and output the 3 different
> format framse to my 3 output files in parallel (threaded).  I realize
> that this only saves me the overhead of the initial read but I'd have
> to guess it would improve my transcoding time.
> 
> Any help/feedback is appreciated
>