If your media player says it can't play the AVI or MP4 file, don't delete it yet.
Install a universal player like VLC Media Player . VLC contains its own internal codecs, allowing it to play MP4, AVI, and AAC files that Windows Media Player might reject. B. Broken File Headers or "0 Length" Files Titanic Index Of Last Modified Mp4 Wma Aac Avi Fix
ffmpeg -i input.mp4 -c copy -movflags +faststart output.mp4 If your media player says it can't play