[ExtractStream] Lip Sync with mplex and netmplex

[David Gerdes]

You can already do this if you edit on Linux or have unix tools on Windows

A chunk is 131072 bytes. you can use the 'dd' command to pull out any
chunks you want. to cut off the first and last 200 chunks from a 
100,000 chunk file, use the command:

dd if=stream.ty of=edited.ty bs=131072 skip=200 count=99600


The stream becomes less compatible than it already was, but I was
successful using this method to remove just enough to fit a 100 minute
movie onto two SVCDs.

Also note that it is much cleaner to crop at Groups of Pictures rather
than chunks, thus keeping audio and video pieces together. 

This can give you very coarse control, enough to trim at beginning and
end, but if you want to edit commercials, long term, I would go with a 
group of pictures editting tool rather than chunk based. 


Stealth Dave wrote:
> 
> That's an interesting way to get a very cheap editing tool. I like it! 
> A suggestion though? In addition to being able to drop 'x' number of
> chunks off the front, how about being able to specify only 'y' number of
> chunks be processed as well? i.e., throw away the first 80 chunks and
> save only the next 300, etc. That would allow one to process a small
> subset of chunks at a time.
> 
> Be forewarned that this may not produce a viable mpeg stream. MPEG2
> especially is very picky about how it is chopped up.
> 
> - Stealth Dave
> 
> On Tue, 2002-02-26 at 17:47, Roger Merchberger wrote:
> > I have more changes to make to zss - buffered input, the ability of
> > dropping 'x' number of chunks from the beginning, and adding
> > verbosity to the logging from the command line - but most of these
> > changes are still on paper. Sometime this weekend, they should become
> > reality...
> > 
> > HTH,
> > Roger "Merch" Merchberger
> > 
> -- 
> David E. Still phone:818.980.6909
> dave@s... http://www.stilldesigning.com
> 
> 
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-- 
David Gerdes CCIE #6911 Tiercel Consulting dgerdes@t...