Fwd: Track Header's duration value versus Media Handler Header's duration value

Subject: Fwd: Track Header's duration value versus Media Handler Header's duration value

From: Tim Monroe <email@hidden>

Date: Thu, 27 Oct 2005 12:42:04 -0700

Delivered-to: email@hidden

On Oct 27, 2005, at 12:10 PM, email@hidden wrote:

Well, lets see.
The timescales can be different.
Not all the media is used in the track.
The media may be used multiple times in the track.
The track has blank spots where there is no media.

there may be other reasons.

On 27-Oct-05, at 11:53 AM, Graham Anderson wrote:

How does the Media Handler's duration value correlate to the Track
Header's duration value ?
Is it related in some way ?

Track Header [tkhd]
duration= 18579

Edits [edts]
Edit List [elst]
trackdur = 18579 //same value which makes sense

Media[mdia]
Media Handler Header[mdhd]
duration = 92900 // huh ?
timescale = 2997

many thanks
g

The track duration is expressed in the movie time scale, which I'm gonna guess is 600. So 18579 / 600 = 30.965 seconds of movie. The media duration is expressed in the media time scale, here 2997. Looks like 92900 / 2997 = 30.99 seconds of media. Not sure there is a problem here.

Tim Monroe

QuickTime Engineering

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