[FFmpeg-devel] [PATCH] (for discussion): cuvid: allow to crop and resize in decoder

[wm4]

On Sun, 12 Feb 2017 21:07:40 +0100
Miroslav Slugeň <thunder.m at email.cz> wrote:

> Dne 12.2.2017 v 20:59 Hendrik Leppkes napsal(a):
> > On Sun, Feb 12, 2017 at 8:51 PM, Miroslav Slugeň <thunder.m at email.cz> wrote:  
> >> This patch is for discussion only, not ready to commit yet.
> >>
> >> 1. Cuvid decoder actualy support scaling input to requested resolution
> >> without any performance penalty (like libnpp does), so this patch is proof
> >> of concept that it is working like expected.
> >>  
> > I don't think scaling is something a decoder should be doing, we don't
> > really want all sorts of video processing jumbled up into one
> > monolithic cuvid thing, but rather keep tasks separated.
> >
> > - Hendrik
> > _______________________________________________
> > ffmpeg-devel mailing list
> > ffmpeg-devel at ffmpeg.org
> > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel  
> Yes, but when you transcoding from FHD or 4K to SD quality it could save 
> alotof GPU resources.
> 
> We have one example where "ONE" Quadro P5000 (2xNVENC) is downscaling 
> about 74 FHD streams to SD at realtime.
> 
> I know it is not something that is acceptable in current ffmpeg, maybe 
> libav could adopt this patch.

You mean the Libav project? They'd be even less likely to accept such a
patch.

Anyway, I don't think this would be slower than doing it in some sort
of separate cuda video filter.