[FFmpeg-devel] [PATCH] H.264 I-frames with SEI are also key frames

Ivan Schreter schreter
Thu Mar 5 22:32:42 CET 2009

madshi wrote:
> Ivan Schreter schrieb:
>> Hi,
>> I just found out that my new seeking code doesn't work with AVCHD 
>> files from a Canon camcorder. The reason being, no key frames are 
>> detected (except first IDR slice), since this camcorder doesn't store 
>> SEI recovery point. In this case, I-slices are taken as key frames.
>> So I'm afraid, we need to consider I-slice as a key frame, even if 
>> recovery point is not set (see attached patch).
>> BTW, as we already discussed with Michael, convergence handling needs 
>> to be cleaned up anyway, since H.264 does it a little differently than 
>> originally thought.
>> Regards,
>> Ivan
> Would it make sense to consider I-slices as key frames only
> if no SEI recovery points are in the stream? Or in other
> words: As soon as you find a recovery point, you might no
> longer want to treat every I-slice as a key frame in that
> particular stream.
> Just a suggestion...
It is a possibility, yes.

Michael: What do you think?



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