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Originally Posted by Turtleggjp
Is the Picture Coding Extension in the MPEG2 data itself?
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Yes, of course. It's part of the MPEG2 video syntax. You can't reliably find frames just using the transport layer and PES syntax.
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One more thing, does the non-NV indexer detect frames the same way? I don't use it much anymore, but I would like my program to be able to use those indexes too someday.
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I believe it is the same. The source for it is available.
If you need any help finding the cause of discrepancies between our methods, let me know. I do think you'll need to parse the video syntax, though. It's not so hard.