Choppy on B&W Sequence

**marine** · 10-13-2006,02:11 AM

SMS is really an amazing program for me and for most of the time, SMS playback is very smooth. But I just find it becomes very choppy during the black and white scenes of a movie, or even when the the black and white content is fitted in most of the screen.

Can anyone confirm this?

**znoby** · 10-13-2006,03:01 AM

I notice this during the intro to Chappelle's Show (which I rip from DVDs myself). The intro is 2 people on a white background. Choppy is a good word to describe it, it's not losing frames, but the image is literally jumping around.

**rathunter** · 10-14-2006,12:14 AM

Often black and white video can be grainy video (although color can also be grainy). Grainy video doesn't compress very well. This could make it choppy, or it may increase the (variable) bitrate above the throughput. This is just a guess--are your scenes grainy?

**znoby** · 10-15-2006,12:29 AM

Well the video is not grainy, and the audio is fine, but during the opening scenes of all of Chappelle's Show, the video literally jumps around on screen (for example someone's head is there one second, then half an inch to an inch somewhere else the next). Once the opening is over, this problem no longer happens. Real strange

**marine** · 10-15-2006,12:45 AM

Originally Posted by rathunter

Often black and white video can be grainy video (although color can also be grainy). Grainy video doesn't compress very well. This could make it choppy, or it may increase the (variable) bitrate above the throughput. This is just a guess--are your scenes grainy?

I think you are right, that may be the reason! Although it's hard to define how grainy it is. Are there any tools I can easy watch the bit rate of a media file (in details)?

**rathunter** · 10-15-2006,02:11 PM

The jumping during a show intro could also result from a rising bitrate because often those segments have fast cuts. When a frame is very different from the previous frame more information must be encoded. There are probably programs to watch or analyse the bitrate during playback, but I've only done it during encoding.

**Z-Saber** · 10-15-2006,05:04 PM

Chapelle's Show's intro doesn't have a lot of cuts and whatnot. It's just a white background with a couple of guys.

**znoby** · 10-20-2006,11:33 PM

I know - that's why I think it's so strange (yet to test on 1.8 rev.1)

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