Overhauling the thresholds and mixing proportions for mfqe postprocessor.
Makes the thresholds for the multiframe quality enhancement module depend on the difference between the base quantizers. Also modifies the mixing function to weigh the current low quality frame less if the difference in quantizer is large. With the above modifications mfqe works well for both scalable patterns as well as low quality key frames. Change-Id: If24e94f63f3c292f939eea94f627e7ebfb27cb75
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