Interlacing = PAFF or MBAFF, there is no "alternative" interlacing method for H.264/AVC. I'd pin the blame on PAFF decoding, MBAFF decoding I think has been solid for a while. I shall take a look myself tomorrow, but if it's PAFF I'd consider letting ffmpeg's developers know, since they're the primary libavcodec developers.
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On Discworld it is clearly recognized that million-to-one chances happen 9 times out of 10. If the hero did not overcome huge odds, what would be the point? Terry Pratchett - The Science Of Discworld
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