Video Pan Shots Stutter!

[RKerly]

Help! Video clips look great (clean & smooth), but ocassionally I've notice a stutter when the camera is panning a scene. Any tips would be cool! Thanks! Bob

[Gazorgan]

Need Details.

Most likely it's a bitrate issue. Panning is demanding, since you are changeing data in 2 axies. This requires more bitrate. There ware workarounds for this in fast action camera work, but generally not available for most home users.

It all depends on your camera (I'm assuming it's at the camera stage, not a converted MPEG2 since you haven't mentioned any conversions?) settings and how it saves the video.

If the video is already captured, then there's probably nothing wrong. What you may be seeing is Interlaced Artifacts. A computer monitor will display since it's not interlaced. A TV is interlaced and you won't see them. Look at the video clips in a de-interlacing viewer like PowerDVD. It can also be from viewing the video in the wrong filed order (interlaced video has 2 fileds, A and B, try flipping the setting).

[RKerly]

Thanks for the Quick Reply! The video content is professionally shot and edited and mastered to Beta-SP. The video looks great. I use Canopus Procoder to convert to mpeg2 and then author using Sonic DVD Producer.
I'm sure it's a bitrate issue, I've been using the Standard CBR (6000)) and I'm experimenting with VBR setting. Any input would be helpful! Thanks! Bob

[FOO]

Wrong field order looks like that .
6000 kbps should be more than adequate for a tape

[RKerly]

I think if I had the wrong field order it would show up on the Beta-SP master when I played it back on a NTSC monitor. In fact I've seen the problem before. I've got extensive experience in Animation/Special Effects compositing to understand field order and 3/2 pulldown issues. Again the mastered tape is flawless, but after I convert to mpeg2 this is where I see a slight stutter in some medium speed pan shots. It's not real bad, just something that bugs me. Thanks again everyone for any ideas. Bob

[racer-x]

A good way to tell if it's field oreder, is to take a samll section of the problem scene and encode 2 Mpeg files with each field order first. Next put both video clips (correctly labled) on a DVDRW and watch them on a TV. If one is smooth, then that is the correct field order to use.

You could also encode a couple of extra clips with different bitrate to see if thet helps.