half hearted refactoring to make countTrailingNopFrames callable statically
first working impl of frame decoder for H264 asset source, not fully tested
fix H264 frame decoder display time and frame index calculation bugs
rework AVAssetFrameDecoder to detect movie dimensions when opening asset, rework AVAssetJoinAlphaResourceLoader to use asset frame decoders instead of decoding to mvid first, enable just the explosion decode test
fix memory leak in frame buffer allocation logic in AVAssetFrameDecoder and generate some decode time numbers
cleanup parameter passing logic in AVAssetJoinAlphaResourceLoader
drop image from previous frame ref in the asset frame decoder to make sure that next frame decode will always work
rewrite AVAssetReaderConvertMaxvid to make use of AVAssetFrameDecoder, enable test case