[Libav-user] Decoding H264 frames on Windows

Carl Eugen Hoyos ceffmpeg at gmail.com
Mon Oct 3 14:45:32 EEST 2016

2016-10-03 12:52 GMT+02:00 Alex Grosu <agrosu at c-s.ro>:

> I am having some issues with time decoding H.264 frames with libavcodec. I
> am receiving 1920x1080 frames at 25 FPS, thus a frame should be displayed
> each 40 ms. But the decoding time per frame is between 55 ms and 83 ms, way
> too much.
> I am thinking at the following strategy: create 4 threads, each thread will
> decode a I-Frame slice (composed by SPS and PPS and IDR + all NACs until the
> next SPS&PPS&IDR). In theory, this should work on a >4CPUs processor.
> My question is: is there any other way in handling this kind of situation?

FFmpeg already contains a multi-threaded H.264 decoder: While it scales badly
I don't expect a wrapper implementation to work much better.
(Unless you really have full control over gop size, in this case you know
something that the FFmpeg decoder cannot know.)

Carl Eugen

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