[FFmpeg-devel] [PATCH] lavc/vc1dec: add multi-slice decoding support for hwaccel.

[Hendrik Leppkes]

On Tue, Nov 15, 2016 at 1:39 AM, Hendrik Leppkes <h.leppkes at gmail.com> wrote:
> On Tue, Nov 15, 2016 at 1:19 AM, Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
>> 2016-11-14 23:47 GMT+01:00 James Almer <jamrial at gmail.com>:
>>
>>> but vc1_sa10143 fails using DXVA2 and a recent driver.
>>
>> I suspect it actually passes with DXVA2: FFmpeg is not
>> bit-exact for vc1.
>
> Looks like you are right, thats the hashes I get as well.
>
> In any case, I have a working WIP patch that fixes sa10091 and sa20021
> with DXVA2, which were broken before.
> I'll clean it up tomorrow and send it for testing.
>
> Unfortunately I don't have a sample for field mode with slices, so
> that remains un-implemented. If someone comes across such a thing,
> that would be nice to have.
>

Here is my current work in progress:
https://github.com/Nevcairiel/FFmpeg/commits/vc1slices

It fixes sa10091 and sa20021 on NVIDIA with DXVA2 for me. Note that
sa10143 breakage is from the software decoder not being bitexact, and
not a hwaccel failure (it doesn't even use slices).

Appreciate any testing on other hardware or on VAAPI/VDPAU.

- Hendrik