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Important: This document is part of the Legacy section of the ADC Reference Library. This information should not be used for new development.

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CompressSequenceBegin & Ethernet in QuickTime

Q When I send compressed images over Ethernet, CompressSequenceBegin doesn't fill in the ImageDescription, which is needed at the other end of the conference link to DecompressSequenceBegin. Is this a bug?

A CompressSequenceBegin doesn't actually modify the handle that you pass. Instead, QuickTime makes note of the handle that's passed, but it doesn't actually modify the contents until the first call that actually compresses data, such as CompressSequenceFrame. At that point, the handle is changed. If you can postpone dealing with the image descriptor until after the first call that compresses data, your code should work.

[May 01 1995]