[FFmpeg-devel] [PATCH 3/3] avcodec: Implement mpeg4 nvdec hwaccel

Michael Niedermayer michael at niedermayer.cc
Mon Nov 20 23:53:00 EET 2017

On Sun, Nov 19, 2017 at 11:52:28AM -0800, Philip Langdale wrote:
> This was predictably nightmarish, given how ridiculous mpeg4 is.
> I had to stare at the cuvid parser output for a long time to work
> out what each field was supposed to be, and even then, I still don't
> fully understand some of them, particularly:
> vop_coded: I think this means whether the vop has a picture shape,
>            and therefore a picture type. I have no samples where
>            this is not the case.
> divx_flags: There's obviously no documentation on what the possible
>             flags are. I simply observed that this is '0' for a
>             normal bitstream and '5' for packed b-frames.

> gmc_enabled: This seems to map to mc_sel being non-zero, but I also
>              have no samples where that is true.

seems to use gmc, didnt check how compex or trivial its use is

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety -- Benjamin Franklin
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