MP4GetTrackNumberOfSamples - Get the number of samples in a track
hFile Specifies the mp4 file to which the operation applies.
Specifies the track for which the number of samples is desired.
Upon success, the number of samples in the track. Upon an error, 0.
MP4GetTrackNumberOfSamples returns the number of samples in the
specified track in the mp4 file. Sample id’s are the consecutive
sequence of numbers from 1 to the total number of samples, i.e. 1-based
indexing, not 0-based indexing.