I am facing issue while transcoding using “scale_npp” in complex filter of ffmpeg.
I have h264 ts file as a input and added closed caption support in nvenc to preserve captions.
Here in output , some captions text missing.
Is there any specific support/patch needs to add for (scale_npp) GPU scaling? When I use software scaling captions are proper in output but with scale_npp option, it causes a problem.
I have used patch to add caption support.
http://trac.ffmpeg.org/ticket/6802
Here is patch commited in ffmpeg for nvenc. and add some logic in cuvid decoder to pass side data to encoder from cuvid decoder.
scale_npp is an option provided to do scaling on the surface of GPU instead of CPU scaling.
Ex. We can add option as below in ffmepg command.
-filter_complex “[0:v]yadif_cuda=1:-1:0,scale_npp=1920:1080:format=yuv420p[out1]”
My issue is here like when I use “scale_npp” in above patch , my captions in output affected(missing some text) , with CPU scaling option in the above patch it works.
Like CPU scaling option
“scale=-1:480” in stead of “scale_npp”.