More robust key frame index setting #489
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During the can, we currently map a FrameInfo from the
allFramesvec to thekeyFramesvec by checking for pts equality. That's not 100% robust as there may exist some 0-duration frames at the same pts of the keyFrame.We're also not 100% sure that this isn't reliant on metadata somehow.
This PR makes the process more robust by not relying on metadata and by doing the mapping ourselves, adding a new
isKeyFramefield to the struct.