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Originally posted by midiguy
also, in autoRV9, it has options for "normal video" "smooth video" and "sharpest video".. I always use sharpest, but what exactly does puitting it on normal or smooth do? does it pre-process the source?
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Glad you asked. That's always been a confusing option, because it affects a few non-documented internal parameters. It was designed mainly for low bitrates, and is the trade-off in the encoder between frame rate and quality/sharpness. So 'sharpest' would be better quality/sharper but skip more frames. There is no pre-filtering.
For VBR and higher bitrates, the 'normal' vs 'sharpest' will have very little effect, if any. However, the 'smooth' setting has the following effect: If you choose 'smooth', the encoder will operate in HHR mode (half-horizontal resolution) for video sizes larger than 640x320. HHR means to resample and encode at half the width, and have the player scale back on playback. This looks very smooth, but is a good trade-off for very low bitrates, relative to video size. I rarely use it though. HHR in RealVideo was more common in the past, when 'normal' would use HHR the way 'smooth' does now. We probably should make HHR a separate option.