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Jeff,
My example is solar imaging....
If you use say AS3! For quality assessment and stacking. What is does is analyse the total video for the best quality image and then matching the rest of the frames to that. If there’s no movement - rotation etc then each frame will effectively have the same basic data. In this case the final stack should reflect the best quality outcome.
If, like me in solar, there’s dynamic movement across ALL the frames (think about prominences changing over the duration of the video) a long AVI video is a bad choice! The stacking program will attempt to stack the best frames which may be subject to movements.
It’s much better to run a series of shorter AVI to get the best quality result with minimal movement. Processing each AVI and then if appropriate stacking the final images.
It may well be that the rotation of the planet in aggravating the quality of the stack. You could use Vdub to cut the large video into smaller AVI’s and see if there’s any improvement.
Summary: large AVI files are not the best solution.
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