The MP4 file might be open in another application (like a video player or converter) during the export process. Verify Data Flow Destinations
if the file was truncated (cut off). You will need a "healthy" file from the same source to act as a reference for the repair. ssis951mp4 fix
. These can rebuild the file index if the "moov atom" is missing or damaged. Disable Hardware Acceleration The MP4 file might be open in another