MP4 container

To support efficient streaming in Media Services On Demand, all MP4 containers should have their MOOV box placed at the beginning of the file, before any MDAT box but after any FTYP box. If the video file does have an MDAT box before the MOOV atom it will still play back, but you might experience a higher start-up time due to the round trip required to determine the exact location of the MOOV box.

Many encoders provide an option that ensures proper placement of this box, usually labeled with something like “Prepare for Streaming.” Content that does not follow this recommendation can be fixed using tools to move the MOOV atom to the proper location. Several free tools are available online that can correct this very quickly without the need to re-encode.