Edit: Just seeing that your dimensions are 672x288
uh... I'll leave what I posted anyway.
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Varying results for various reasons. Convert it to a more edit friendly format.
Pro Res(Requires Quicktime) - Can convert to this on windows using EyeFrame Converter
DNxHD(Requires Quicktime) - Free codec installations from Avid
Cineform(Requires GoPro Studio Install) - Free from GoPro website
Lagarith(Prepare to run out of disk space) - Free download
What format/codec do you work with, John?