MP4GetSampleSize - Get the size of a track sample
hFile Specifies the mp4 file to which the operation applies.
Specifies the track to which the operation applies.
Specifies the sample to which the operation applies. Caveat: the
first sample has id 1 not 0.
Upon success, the sample size in bytes. Upon an error, 0.
MP4GetSampleSize returns the size in bytes of the specified sample from
the specified track.