• re-encode videos as H.265

For non-interlaced videos

ffmpeg -i input.mpg -c:v libx265 -crf 30 -c:a libopus -b:a 56k -frame_duration 60 output.mkv

For interlaced videos
Use -vf yadif=1 as interlace filter to prevent interlacing artifacts:

ffmpeg -i input.mpg -vf yadif=1 -c:v libx265 -crf 30 -c:a libopus -b:a 56k -frame_duration 60 output.mkv

ffmpeg -i input.mkv -pix_fmt yuv420p10le -c:v libx265 -crf 28 -x265-params profile=main10 out.mkv

Список поддерживаемых профилей для кодека h265

ffmpeg -h encoder=libx265

ffmpeg -i vid.mp4 -c:v libx265 -crf 22 -c:a copy vid-265-crf-22.mp4

re-encode videos as H.265