MP4SetTrackEditMediaStart man page

MP4SetTrackEditMediaStart ā€” Set the media start time of a track edit segment


#include <mp4.h>

bool MP4SetTrackEditMediaStart(
MP4FileHandle hFile,
MP4TrackId trackId,
MP4EditId editId,
MP4Timestamp mediaStartTime



Specifies the mp4 file to which the operation applies.


Specifies the track to which the operation applies.


Specifies the edit segment to which the operation applies. Caveat: the first edit has id 1 not 0.


Species the new value for the media start in track time scale units.

Return Values

Upon success, true (1). Upon an error, false (0).


MP4SetTrackEditMediaStart sets the media start time of the specified edit segment from the specified track in the track time scale units. See MP4ConvertToTrackTimestamp() for how to map this value from another time scale.

Note that this differs from the edit segment start time. For example:

EditId Start MediaStart Duration

1 0 15 30
2 30 120 20
3 50 3000 10

See Also

MP4(3) MP4GetTrackEditMediaStart(3)

Referenced By


Version 0.9 Cisco Systems Inc. MP4 File Format Library