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[mmalcodec] Remove dropping logic. It only seems to make things worse
We get frequent reports of stuttery playback especially with live tv, the PVR channel preview window and overlays with mmal. The problem is whenever the dropping code is triggered it makes the problem worse. I suspect this is an issue with the asynchronous mmal decoder which has a large input buffer (~2MB) which for a low bitrate stream can contain a couple of seconds of video. We end up dropping a very large number of frames which tends to upset dvdplayer more. Seeing as dropping frames has marginal benefit - the work is done on the gpu which isn't the bottleneck, and discarding frames doesn't help the processing on the arm side sigificantly, just don't do it.
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