MP4WriteRtpHint - Write an RTP hint
bool isSyncSample = true
hFile Specifies the mp4 file to which the operation applies.
Specifies the hint track to which the operation applies.
The duration for this hint sample. Typically this is the same
duration as for the corresponding sample in the reference media
track. Caveat: The duration should be in the hint track
timescale units, again typically the same as the reference media
The sync/random access flag for this sample. Typically this is
the same as for the corresponding sample in the reference media
Upon success, true (1). Upon an error, false (0).
MP4WriteRtpHint writes the current pending hint created with
MP4AddRtpHint() to the specified hint track.
MP4(3) MP4AddRtpHint (3)