ffmpeg -i you.s02e05.mkv -vn -c:a copy you.s02e05_audio.aac Check track numbers with ffmpeg -i file.mkv . Suppose video track #0, audio #1, subtitles #2. Remove subtitles:
for f in you.s02e*.mkv; do ffmpeg -i "$f" -c:v libx264 -crf 23 "${f%.mkv}_compressed.mp4" done Delay audio by 0.5 seconds: you s02e05 ffmpeg
ffmpeg -i you.s02e05.mkv -c:v libx264 -c:a aac you.s02e05.mp4 Take a frame at 00:15:30 and save as JPEG: ffmpeg -i you