[M4IF Technotes] Identification of MPEG4 video stream?

[Trevor NG]

Dear experts,
How can I identify a video stream as mp4 video? Is it strong enough to say a stream is not mp4 video if it doesn't contain start codes like 0x000001B6 (VOP)?
If the stream uses short header, is VOP start code still necessary to be present?
Thanks in advance,
Trevor
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