.TH "MP4" "3" "Version 0.9" "Cisco Systems Inc." "MP4 File Format Library".SH "NAME".LP \fBMP4GetSampleDuration\fR \- Get the duration of a track sample.SH "SYNTAX".LP #include <mp4.h>.LP MP4Duration \fBMP4GetSampleDuration\fR(.br 	MP4FileHandle \fIhFile\fP,.br 	MP4TrackId \fItrackId\fP,.br 	MP4SampleId \fIsampleId\fP.br );.SH "ARGUMENTS".LP .TP \fIhFile\fPSpecifies the mp4 file to which the operation applies..TP \fItrackId\fPSpecifies the track to which the operation applies..TP \fIsampleId\fPSpecifies the sample to which the operation applies. Caveat: the first sample has id 1 not 0..SH "RETURN VALUES".LP Upon success, the sample duration in track time scale units. Upon an error, MP4_INVALID_DURATION..SH "DESCRIPTION".LP \fBMP4GetSampleDuration\fR returns the duration of the specified sample from the specified track in the track time scale units. See MP4ConvertFromTrackDuration() for how to map this value to another time scale..SH "SEE ALSO".LP MP4(3) MP4ConvertFromTrackDuration(3)