ffmpeg -i source.mkv -vf "scale=720:480,setfield=tff" -c:v mpeg2video -b:v 7000k -maxrate 8000k -bufsize 2000k -flags +ilme+ildct -top 1 -c:a copy output.m2v Use eac3to or FFmpeg:

ffmpeg -i source.mkv -c:a ac3 -b:a 448k -center_mixlev 0.707 output_51.ac3 Create chapters.txt :