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0 pointsthe84729y ago0 comments

The maximum number of references frames, i.e. how much the Decoded Picture Buffer has to hold, is 16. So even if a GOP is 1 minute long you would have to hold at most 16 pictures in memory to have enough information to stream over that 1-minute segment.

So I still do not see how this would prohibit parallel processing.

0 comments

pedrocr9y ago

Not sure how that would work. You have a thread that's decoding the frames 1 minute in front of where playback is, so if you're not decoding full frames and storing them until you need to display them what is that thread doing?

the8472OP9y ago

transcoding or video editing in slices is a common application.

you cut the video into a handful of parts at keyframes, process the parts individually in a streaming manner and then splice the partial results together.

If we're talking about playback then creating seeking-thumbnails could similarly benefit from parallel processing.

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