Video conversion

Linux

ffmpeg with nvidia HW encoding

Very fast (430 fps for 1280x720) with good/medium quality.

optirun ffmpeg -i input.mkv -c:v h264_nvenc -profile:v main -preset:v fast -b:v 1M output.mkv

It is medium speed (165 fps for 1280x720) with good quality.

optirun ffmpeg -i input.mkv -c:v h264_nvenc -profile:v main -preset:v medium -b:v 1M output.mkv

ffmpeg with vaapi HW decoding & encoding

It is fast (240 fps for 1280x720), but quality below 5Mbps is poor.

ffmpeg -hwaccel vaapi -hwaccel_output_format vaapi -vaapi_device /dev/dri/renderD128 -i input.mkv -vf 'format=nv12|vaapi,hwupload,scale_vaapi=w=1280:h=720' -c:v h264_vaapi -b:v 5M output.mkv

Hardware decoding & encoding with QP ICQ setting, High profile and audio AAC

ffmpeg -hwaccel vaapi -hwaccel_output_format vaapi -vaapi_device /dev/dri/renderD128 -i input.mp4 -vf 'format=nv12|vaapi,hwupload,scale_vaapi=w=1280:h=720' -c:v h264_vaapi -qp 31 -rc_mode 4 -profile:v 100 -level 4.1 -c:a aac -b:a 96k output.mkv

ffmpeg with software encoding

Slow (120 fps for 1280x720), but the encoding quality is good.

ffmpeg -i input.mkv -c:v libx264 -profile:v main -preset:v fast -b:v 1M output.mkv

Slow (90 fps for 1280x720), but the encoding quality is good.

ffmpeg -i input.mkv -c:v libx264 -profile:v main -preset:v medium -b:v 1M output.mkv

Windows

Quick sync

Quick sync decoding / scaling / encoding, QP:

ffmpeg -init_hw_device qsv=hw -hwaccel qsv -c:v h264_qsv -filter_hw_device hw -i "Stulecie Winnych 42 S04E03.mp4" -vf "hwupload=extra_hw_frames=64,format=qsv,scale_qsv=w=1280:h=720" -c:v h264_qsv -global_quality 31 -profile:v 100 -level 4.1 -c:a aac -b:a 96k output.mp4