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It may be useful to have a copy of the original video to check the behaviour of the GIF animation encoder. As already mentioned, the main issue will be the visual artifacts, probably caused by wrong bit flags defining the meaning of transparency. Their support may depend on the renderer in different viewers, too; I remember a warning about that in JASC Animation Shop 3.
I remembered one quirk: Animated GIFs support a variable framerate. The duration of every frame may only be integer multiples of 1/100 s, but every frame may have a different one. So one would have to analyze this sequence. Also the playback speed is not guaranteed to be supported by all viewers, some may have their own technical limits. Different webbrowsers or image viewers may be able to play them fast enough, others may fail.
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