Video file editor?

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http://www.linuxforums.org – What's the most capable one you know of? I offloaded my DVR hard disk's recordings, and 90% of them play in Media Player Classic, including premium channel recordings. Still there's about 200 that will not play in ANY media players, of the 2 dozen or so that I've tried. So I want to break them down in an editor program, to see if it's a codec issue, corruption, decryption, or other issue... Ideas? (HowTos)