[Mp4-tech] Question about QuickTime Pro

[Ryan Lei]

Sorry for the mass email. I have this question for the QuickTime expert.
I am using QuickTime Pro to create 3gp files with H.263 elementary streams
in it. When I do transcoding
I can specify the frame rate and I frames interval. After I create the 3gp
file and open it in the analyzer, I can
See there is a SyncSampleBox, which tells me which frames are I frame.
However, when I extract the H.263
Elementary stream out from the 3gp file, and open the elementary stream in
the analyzer, it tells me only
The first frame is the I frame, all other frames are all P frames. If I open
the stream in a Hex Editor and check
the frame start code of H.263 stream, it actually shows that there is only 1
I frame. Can somebody tell me what's
going on.
Ryan Lei
ATI Technologies Inc.
Handheld Products Team
33 Commerce Valley Dr. East
1-905-8822600 ext 2712 (o)
www.discover.uottawa.ca/~leizj/ <www.discover.uottawa.ca/~leizj/> 
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