Remove non-pre scenecut
Add support for no-b-adapt + pre-scenecut (patch by BugMaster) Pre-scenecut was generally better than regular scenecut in terms of accuracy and regular scenecut didn't work in threaded mode anyways. Add no-scenecut option (scenecut=0 is now no scenecut; previously it was -1) Fix an incorrect bias towards P-frames near scenecuts with B-adapt 2. Simplify pre-scenecut code.
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