[libav-bugs] [Bug 55] cdg: set AV_PKT_FLAG_KEY

bugzilla-daemon at aruru.libav.org bugzilla-daemon at aruru.libav.org
Thu Nov 24 12:50:08 CET 2011


http://bugzilla.libav.org/show_bug.cgi?id=55

Robert Swain <robert.swain at gmail.com> changed:

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                 CC|                            |robert.swain at gmail.com

--- Comment #2 from Robert Swain <robert.swain at gmail.com> 2011-11-24 12:50:08 CET ---
Looking at http://www.ccs.neu.edu/home/bchafy/cdb/info/cdg it seems there is a
tile type that XORs with the pixels already on screen, which means it is
non-key. In terms of packets, I suppose some of the instructions would
constitute the key semantic. To fix this, those cases could be enumerated and
filtered out to set the key flag for the packet.

Because of the tiling nature of the codec, the decoder might have to do some
magic to identify what is a keyframe other than the instructions that clear the
whole screen. I'm not sure this format is particularly seekable.

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