mp4gettrackduration.3

完整的RTP RTSP代码库

.TH "MP4" "3" "Version 0.9" "Cisco Systems Inc." "MP4 File Format Library"
.SH "NAME"
.LP 
\fBMP4GetTrackDuration\fR \- Get the duration of a track
.SH "SYNTAX"
.LP 
#include <mp4.h>
.LP 
MP4Duration \fBMP4GetTrackDuration\fR(
.br 
	MP4FileHandle \fIhFile\fP,
.br 
	MP4TrackId \fItrackId\fP
.br 
)
.SH "ARGUMENTS"
.LP 
.TP 
\fIhFile\fP
Specifies the mp4 file to which the operation applies.
.TP 
\fItrackId\fP
Specifies the track for which the duration is desired.
.SH "RETURN VALUES"
.LP 
The duration in track time scale units of the track in the mp4 file.
.SH "DESCRIPTION"
.LP 
\fBMP4GetTrackDuration\fR returns the total duration of all the samples in the specified track in the mp4 file. 
.LP 
Caveat: The value is in units of the track time scale.
.SH "SEE ALSO"
.LP 
MP4(3)