Question about video file tags: Duration, TrackDuration, MediaDuration

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Posted on Sat May 17 22:56:36 2008 by akrk1986

Question about video file tags: Duration, TrackDuration, MediaDuration

I'm using ExifTool to read information from video files and ran into a file that has different values in some of those tags.
I have two questions:
1) What is the difference between the above 3 tags? Or, actually, between all six (those and their group 1 counterparts)?
2) What is the difference between 'MediaDuration' and 'MediaDuration (1)'? I understand that tags with '(1)' are from group 1, but I'm unclear what the distinction between Group 1 and non-Group 1 tags.
Thanks, Amir

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Posted on Mon May 19 01:23:10 2008 by exiftool in response to 7894

Re: Question about video file tags: Duration, TrackDuration, MediaDuration

"MediaDuration" and "MediaDuration (1)" are simply different tag keys for the same tag name. This happens whenever a duplicate tag name is encountered.

Duration should be the length of the Movie. If it has separate tracks, each track may have its own duration. The length of sequential tracks should add to the total movie length provided they run for the entire movie. I'm not entirely sure what MediaDuration is, and would have to consult the QuickTime or MP4 documentation to figure this out.

Sometimes it is useful to decode the file with -v, -v2 or -v3 to see the structure. This sometimes helps in understanding. - Phil

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