[FFmpeg-devel] [PATCH 2/3] avfilter/vf_yadif_cuda: CUDA accelerated deinterlacer

[Philip Langdale]

On 2018-11-01 14:05, Timo Rothenpieler wrote:
> On 01.11.2018 21:54, Carl Eugen Hoyos wrote:
>> 2018-10-26 17:56 GMT+02:00, Philip Langdale <philipl at overt.org>:
>> 
>> Could you add some sample numbers about how fast the cuda
>> variant is compared to cpu?
> 
> I don't think such numbers are overly useful by themselves.
> The primary benefit here is that it's now possible to decode,
> deinterlace and encode all without pulling the frames out of VRAM.
> 
> Though it would definitely be interesting. I guess hwupload +
> yadif_cuda + hwdownload vs. normal yadif is a fair comparison?

Yeah, the comparison is a bit fuzzy, because you completely
change how you think about solving the problem depending on whether
you have a filter available or not. But I did get some data previously.

For cpu decode + cpu yadif, the yadif slowdown is ~50%
For gpu decode + gpu yadif, the yadif slowdown is ~25%

That means, the fps reported by `ffmpeg` when down by 50%/25%
respectively. This was with null encoding.

I can collect data for the up/down case, but I do think it's
unrealistic - no one would actually do that.

--phil