I changed the color level of an video ("ORIGINAL_VIDEO1.MP4") that had previously played well in Apple Quicktime. After brightening,
ffmpeg -i ORIGINAL_VIDEO1.MP4 -vf colorlevels=romin=0.4:gomin=0.4:bomin=0.4 -c:a copy BRIGHTER_VIDEO_1.MP4
BRIGHTER_VIDEO_1.MP4 can no longer be played in Quicktime and it says something about the video missing elements. All the while, VLC plays it perfectly. Is there something I am doing wrong?