A little question about RV9

[Rash]

On AutoRV9 we have the option (under Codec tab) Video Mode: Normal Motion, Sharpest Motion and Smoothest Motion.

I always select Smoothest Motion because I like the word "smooth" hehe. But what are the differences between them?

Thank you very much. ;)

[Tommy Carrot]

It's simply how much frames will be dropped, if the bitrate goes too high. Sharp setting will drop many frames - so the image is sharper. Smooth will be smoother;), but with less dropped frames. Normal is between them.

/iirc. smooth setting reduces the vertical resolution too, then interpolates it back, but i may be wrong/

[karl_lillevold]

@Tommy: That's a good explanation. For high bitrates it should not really matter if you use Normal or Sharp, since the number of frames dropped will be zero in either case. Smooth on the other hand will for the resolutions most often encoded here, drop the resolution horizontally to half, and scale back on playback. This is called HHR or Half Horizontal Resolution, and is very common for digital cable and satellite MPEG-2 .

[Rash]

Thank you guys. ;)

[snowcrash]

karl,

Can you say something about the difference between normal vs sharp? I am particularly interested in how they would differ in low bitrate (~750kbps) encodes using RV9. In my case I'm encoding anime. Any suggestions as to normal vs sharp for my case? Thanks.

[karl_lillevold]

@snowcrash: For such high bitrates as 750 kbps, there should not be any difference between normal and sharp, but stay away from 'smooth' for the reason explained above. The difference between 'normal' and 'sharp' is only noticable for so low bitrates that the encoder has to trade off frame rate for quality, i.e. when it has to decide on dropping down the frame rate to maintain the bitrate.

[Hero--]

Hi,

if I'm using a jobfile/audiencefile where do I set 'Smoothest Motion' parameter?

(or 'Sharpest Image', 'Normal Motion Video')

/H

[karl_lillevold]

In the mediaProfile section, like this:

<mediaProfile>
<videoMode type="string">sharp</videoMode>
</mediaProfile>

[Hero--]

Thanks! :)

/H