On Sat, 24 Jun 2006, Roger Ivie wrote:
> On Sat, 24 Jun 2006, Bob Stia wrote:
> > Have a new problem that has never happened before. Ripped a dvd and
> > converted it to a movie.m2v - then shrunk that to shrink.m2v. ...
Why shrink it? If you're making a 'backup copy' of one of your
DVDs (for the kids to scratch/maul/etc) why not simply use a dual
layer disc and make a 'bit for bit' copy? DL media's down to a dollar
or so for the 'noname' brands and not much more for the "good stuff"
(if you watch out for the rebates and sales).
> > Went to recombine them with mplex for a movie.mpg. All seemed to work well
> > except that the audio is WAY out of sync with the video. Not just a little.
> > But by many many frames...
>
> Yeah, I've seen this. Sometimes quite obnoxiously; I've seen a few
> movies where the audio stream doesn't even start for a second or so!
> To deal with it, I use a little program I wrote called deltapts. It
That's not the only problem that can arise
Naive decode/re-encode pipelines can also run up against DVDs that
switch frame rates. DVD starts out with a 29.97 fps splash screen
and the decoding side uses that frame rate for the entire movie even
though the rate switches to 23.98 with 2:3 pulldown.
> It does have a weakness in that it assumes all audio streams have the
> same delay; it returns the delay for the first audio stream it sees.
Technically it's legal for the audio stream to stop/start at any time.
Not sure if any DVDs use that feature though ;)
> I've seen a couple of cases where that isn't true. For those, I strip
> down to the audio stream I'm interested in using vobstripper, another
I don't bother with either the stripping or the recoding/shrinking -
backups are just that: _exact backups_
Cheers,
Steven Schultz
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