questions about mpeg editing

uuuhmwhat wrote on 7/15/2003, 12:53 AM
How can I cut and paste MPEG files without recompressiond?
There are no GOP indicators that would tell me where I can
do a clean cut.
Basically I need to reencode section of a larger file and
then cut and paste everything together again.
Of course all the orginal encoding has to be retained
without recompression.

Comments

filmy wrote on 7/15/2003, 1:38 AM
Just for the heck of it you might want to look into the Womble MPEG Editor. If you are only taking out one section and not really doing editing this might work for you. http://www.womble.com
mikkie wrote on 7/15/2003, 8:05 AM
"Basically I need to reencode section of a larger file and
then cut and paste everything together again.
Of course all the orginal encoding has to be retained
without recompression. "

Other then something like the womble editor filmy suggested...

I'd use DVD2AVI & VFAPI to get the mpg into Vegas for less prob, greater speed etc. [see doom9.org, digital-digest.com, dvdrhelp.com for instructions and downloads]

Then I'd cut the portions on the timeline in Vegas that I didn't need - the tricky part is there's not a good way to tell your split points for keyframes. A bit of work, but I have used an mpg2 cutter at about where I want to cut, then checked the result -> it will end at the last keyframe usually -> match that point in Vegas. Do the same for the other end, the 2nd cut at the end of the sequence to re-encode, and do your thing with what's left, re-encoding in Vegas, putting stuff back together in TMPGEnc.

As you can see, saving a render, or part of a render can easily be enough work that one can play with getting it right and not save a minute of total proj time. On the other hand, using the dvd2avi method you'll not lose a lot of quality re-encoding everything.
johnmeyer wrote on 7/15/2003, 11:15 AM
TMPGEnc also works for combining MPEG files without re-compression.

I sure hope SF people are listening (they usually are). There seem to be a LOT of requests for this feature, in one form or another, both in Vegas and in DVD-A.
mikkie wrote on 7/15/2003, 11:33 AM
While you're at it John, how about the same for wmv? Winmedia 9 allows the same features we take for granted with avi's - no recompression if nothing changes, combining/editing etc.