So you're basically removing data from the stream to smoothen it out... ? If that's the case, is it noticable? I ask because this is for an interview recorder, and it's pretty important that nothing is missed. I'd think about using GOPchop if it had a command line interface :)
Sorry, I can't release the code as it's part of a commercial project. Regards, MAL Kees Cook wrote: >GOPchop will do this for you. I designed it using kfir streams, so I >think most of the bugs are worked out. Check: > >gopchop.sourceforge.net > > >I haven't found a single decoder that actually pays attention to the >"broken_link" flag. I find this _highly_ irritating. Since GOPs are >optional headers, I assume that these decoders are just cutting corners >and ignoring the GOPs. To solve this problem in GOPchop, I would do two >things: the "correct" thing, which is setting the "broken_link" flag, and >then I actively remove all the B-frames from the video stream that follow >the first I-frame. This appears to totally do the trick. I also set the >"closed" bit, since now the GOP is closed. > >Can you share your code with us? In my most recent CVS, I wrote "mpegcat" >which will spit out all kinds of information about an MPEG2-PS file, >reporting locations, sizes, and flags of all the headers. > >On Wed, Feb 06, 2002 at 02:12:21PM +0000, MAL wrote: > >>This is a last call for aid... >>I am trying to cut sections from an MPEG2 generated by a KFir. >>By my understanding, the KFir uses bi-directional frame coding (IBP), as >>opposed to progressive frame coding, which makes cutting the files at >>clean boundaries very hard. >>I need to be able to cut a file into sections, (for burning to cd >>progressively), and those sections need to be sequential without loss. >> >>I have written a program to almost completely dissect an MPEG2, >>(everything bar decoding the actual pictures), and output a section, but >>regardless of whether I set the group of pictures' header's >>'broken_link' flag, I still get corrupt starts to the beginning of my >>sections. The closed_gop flag within the mpeg2 is set, meaning the fkir >>doesn't encode cleanly cuttable group_of_pictures. >> >>Does anyone know of a way I can "fix" the mpeg2 to have cleanly cuttable >>boundaries, or will I need to re-encode the whole file? >> >>_Any_ help on this subject would be great, I refuse to believe there is >>no way to do it :) >> >>Also, if anyone knows whether you can get the KFir to encode >>differently, shout me pls. >> >>All the best, >> >>MAL >>Komcept Solutions Ltd. >>United Kingdom >> >
