On 9/8/18, Timo Rothenpieler <t...@rothenpieler.org> wrote: > On 9/8/2018 3:49 PM, Timo Rothenpieler wrote: >> From: Roman Arzumanyan <rarzuman...@nvidia.com> >> >> Signed-off-by: Timo Rothenpieler <t...@rothenpieler.org> >> --- >> I'm not overly a fan of a rotate filter that only support 90DEG 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 90DEG angles except that NN is easily 10 times faster > than the current default Cubic.
Perhaps interpolation is useful for other pixel format where vertical and horizontal subsampling are not same. _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
