[FFmpeg-devel] [PATCH] avfilter: add nvidia NPP based transpose filter

[Timo Rothenpieler]

On 9/8/2018 3:49 PM, Timo Rothenpieler wrote:
> From: Roman Arzumanyan <rarzumanyan at nvidia.com>
> 
> Signed-off-by: Timo Rothenpieler <timo at rothenpieler.org>
> ---
> I'm not overly a fan of a rotate filter that only support 90° angles
> either.
> So here's my modified version of the original transpose filter, which
> now behaves the exact same as the software transpose filter.
> 
> Additionally, I removed the format conversion from the filter. That's
> the job of the scale filter, and also saves you from doing pointless
> double format conversion if you scale and transpose NV12 video.
> Nvenc accepts yuv420p/444p input anyway, and if you really need to, one
> can add another scale_npp after to get back nv12.
> 
> A possible commandline for this is:
> ./ffmpeg.exe -hwaccel cuvid -c:v h264_cuvid -i in.mkv -c copy -c:v h264_nvenc -vf scale_npp=format=yuv420p,transpose_npp=cclock_flip out.mkv

I'll probably remove the interp_algo from this before committing, hard 
coding it to nearest neighbor. I'm unable to see any difference between 
them for perfect 90° angles except that NN is easily 10 times faster 
than the current default Cubic.

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