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Tools for Manipulating MPEG Headers?
mattjarvis asks: "Does anyone out there know of a software solution for batch manipulating MPEG file headers, ie. stripping the header and replacing it with another header, or editing the existing header. I've searched the usual places, and have come up with a few libraries that look like they are capable of doing this but I don't seem to be able to find anything already written to do this. Basically I have a client using a hardware MPEG audio recorder, who wishes to change one of the bits in the header ( the original/home bit ) which is causing some problems with other software they are using. Surely this should be relatively simple to achieve and it's possible that I am missing the obvious but there doesn't seem to be anything available open source or not to easily edit the header without reconverting the actual audio stream."
erm... no.
MPEG headers aren't just at the beginning of the file. You'd have to watch the transport stream for video packets, watch for video headers, and *then* flip the bit. For each one throughout the stream.
Most available software will want you to strip the transport stream into video/audio elementary streams before doing anything further. You would then work on the video stream and finally remux.