Processing videos with ffmpeg.

ffmpeg-cheatsheet.md

compressing a video

ffmpeg -i "$input_video" -vf fps=$fps -c:v libx264 -an -preset veryslow -crf $crf "$output_video"

trimming a video to 20 seconds

ffmpeg -i "$input_video" -ss "00:00:00" -t "00:00:20" "$output_video"

scaling a video

ffmpeg -i "$input_video" -vf scale=$height:$width:flags=accurate_rnd "$output_video"

taking a center crop

ffmpeg -i "$input_video" -vf crop=$crop_w:$crop_h:(in_w-$crop_w)/2:(in_h-$crop_h)/2 "$output_video"

converting video to frames

ffmpeg -i "$input_video" "$output_dir/img%05d.png"

converting frames to video

ffmpeg -framerate $fps -pattern_type glob -i "$video_folder"/'*.png' -c:v libx264 "$output_video"