To avoid encountering "juq439mp4" or similar broken files in the future:
: If you prefer your current player, install a pack like the K-Lite Codec Pack to ensure your system can read various MPEG-4 variations. juq439mp4 fixed
: The file header is damaged, often due to an interrupted download or transfer. To avoid encountering "juq439mp4" or similar broken files
: Open VLC, go to Tools > Preferences > Input / Codecs , and set "Damaged or incomplete AVI file" to Always fix . Even for MP4s, renaming the extension to .avi and letting VLC "fix" it can sometimes work. juq439mp4 fixed
: Ensure the SD card or hard drive you are saving to isn't failing.