NVEnc Preview

[Selur]

So the question is, it is possible to use NVEnc to produce in output "true" uncompressed frames ?

No, NVEncC, can't output uncompressed frames.

NVEncC64.exe --avhw --input E:\VideoTest\TestSubs\TestSubs-1.mp4 --lossless --output-format raw --output -| ffmpeg.exe -i - -vcodec rawvideo -pix_fmt yuv420p -loglevel debug -f rawvideo E:\VideoTest\TestSubs\Test2.raw

That does not work, since you output raw H.264, but tell ffmpeg that it reads raw uncompressed video with an unknown size.

NVEncC64.exe --avhw --inputE:\VideoTest\TestSubs\TestSubs-1.mp4 --lossless --output-format raw --output - | ffmpeg.exe -i - -an -vcodec rawvideo -pix_fmt yuv420p -f rawvideo Test_raw_yuv420p.raw

will output a raw yuv420 file.