rewriter: add vp8 keyframe detection function #140
Merged
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We've postponed working on #100
The branch I started more than a month ago is obsolete and does not compile anymore (due to conflicts caused by changes done in the previous PRs). Still, the function for the detection of VP8 frames is somewhat isolated and does not really have any dependencies, so I decided to file the PR with this small function so that I can remove the now obsolete branch while preserving something that could be reused by one who works on the issue in the future.