mp4gettrackvideoframerate.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 
\fBMP4GetTrackVideoFrameRate\fR \- Get the video frame rate of the specified video track
.SH "SYNTAX"
.LP 
#include <mp4.h>
.LP 
float \fBMP4GetTrackVideoFrameRate\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 video frame rate is desired.
.SH "RETURN VALUES"
.LP 
Upon success, the number of video frames per second of the track. Upon an error, 0.
.SH "DESCRIPTION"
.LP 
\fBMP4GetTrackVideoFrameRate\fR returns the frame rate of the video in the specified track in the mp4 file. If the video is variable rate, the average frame rate is returned. 

.SH "SEE ALSO"
.LP 
MP4(3)