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QT H264 compressor won't save animation on export.

the export progress bar is on for a short flash and then the progress panel disappears.
the result: an exported Quicktime file that is only one frame long ( and i did make sure to select animation)
in contrast, QT H263 does work, but i would prefer to work with 264.

what could be the problem here?

i figured out how to 'sort of' fix this

the first time i tried to export a PAL (720X576) project into a 600x480 resolution

now i left the original PAL size and it did work
is this a restriction of the codec?

should there not be some warning?
or is there still some other cause possible?

We will do some test because we only send all information and data to the codec which will create the video file.