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Old 11th August 2009, 16:01   #1  |  Link
iw2z
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Join Date: Aug 2009
Posts: 3
Quicktime files metadata

hi
i'm not sure of this is the right place for this question, but i'll ask anyway...
i've been working on an application that will give me some general info about a quicktime video file (Dimensions, Frame Rate, Compressor Name, Audio channels...)

so i read the "Quicktime File Format Specification" document from apple.com, and i did get to read most of the data i need from the corresponding atoms (atoms are the building units of a quicktime file), but i came across some files that didn't have these atoms at all (since most of these atoms are optional)

examples include
- 'stsd' atoms hold the compressor name, but it's optional
- 'stts' atoms hold data vital to the frame rate calculation, also optional
- 'stss' atoms hold data regarding key frames, also optional

and even though one of the atoms i need isn't even optional, i still couldn't find it ('tkhd' for the video dimensions)

but when i open these files (which missing atoms) they work well, and when i open them in VLC player, i can see the data i need in the 'media information' provided by the player

so my question is: how can i get the data i need even when the atoms aren't available? (it must be doable, VLC proves that!)
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metadata, quick, quicktime, time

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