Now, you'll notice that dwRate/dwScale is Streams, but those are usually low bitrate and seldom used. The significance of the dwRate/dwScale fraction is that MPEG-1 audio framesĭecompress to 1152 samples each it turns out that this is incorrect for MPEG-2 (16-24KHz) and MPEG-2.5 (8-12KHz) Streams, so setting it to zero for VBR operation doesn't work at all - the AVI parsers use the nBlockAlign
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