ffmpeg -i input.mkv -vf "cropdetect" -f null - 2>&1 | grep crop ffmpeg -i input.mkv -codec: copy -start_number 0 -hls_time 10 -hls_list_size 0 -f hls episode.m3u8 10. Add external subtitle file (e.g., SRT) ffmpeg -i input.mkv -i subtitles.srt -c copy -c:s mov_text -metadata:s:s:0 language=eng output_with_subs.mp4 11. Speed up / slow down a scene Double speed (no audio pitch change):

ffmpeg -f concat -safe 0 -i concat.txt -c copy merged.mkv ffmpeg -i superman_and_lois_s04e02.mkv \ -map 0:0 -map 0:1 -map 0:2 \ -c:v libx265 -crf 22 -preset slow \ -vf "scale=1920:1080" \ -c:a aac -b:a 160k \ -c:s copy \ -metadata title="Superman & Lois - S04E02" \ s04e02_1080p.mp4

ffmpeg -i input.mkv -filter_complex "[0:v]setpts=0.5*PTS[v];[0:a]atempo=2.0[a]" -map "[v]" -map "[a]" fast_scene.mp4 First make a concat.txt :