Quote:
Originally Posted by benwaggoner
OH! Gotcha. Sounds like RADL from x265. In that case, they are B-frames only in the sense that the allow prediction from frames later in temporal order.
I think it is technically possible for one of those to reference a P-frame after the IDR, but for most content the encoder wouldn't find useful references there to use, so they wouldn't be in the list.
x264 doesn't have --radl, of course. You could evaluate this if you used a QPfile to force a "bbIP" start sequence, and make the P a better reference for the bb than the I is.
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Thanks for your explanation,
but unfortunately not possible with QPfile ,because using QPfile, the first frame in stream order will always be IDR ,not B.