24 frames at 29.97..?

[bobbystone]

If I set a project to 29.97, then shoot varispeed at 24 frames will the camera introduce the proper 3:2 pulldown? I'm wondering if this might help solve some of the aliasing issues people are having when scaling down to SD. I have a suspicion that these issues may be related less to scaling and more to how the workflow handles the 24 to 60i conversion. Any thoughts?

[Stuart English]

If I set a project to 29.97, then shoot varispeed at 24 frames will the camera introduce the proper 3:2 pulldown?

No, it will play your footage recorded at 23.98 fps at 29.97 fps in a one to one relationship i.e things will be "faster" - no 3:2 pulldown added.


I'm wondering if this might help solve some of the aliasing issues people are having when scaling down to SD.

In my opinion, nothing to do with it. The scaling issues will be a function of the scalers being used. They are probably making assumptions about the vertical resolution available in the source footage that are wrong, and unless filtered correctly, a standard definition signal will have aliasing.

The Panasonic DVX-100 had a similar issue when recording "24P" to DV tape - viewed on an interlace monitor there was aliasing, on a progressive scan monitor there was not. Hence there was a "thick / thin" setting for vertical detail that set a filter to smooth vertical detail for SD interlace use.

[Dj Joofa]

Hence there was a "thick / thin" setting for vertical detail that set a filter to smooth vertical detail for SD interlace use.

Stuart, there's got to be a more intelligent method than blind low-pass filtering for downsizing to SD to remove such aliasing (talking not particularly about monitors, but more regarding the issue of downsizing to SD). And apparently there are, and I would tend to think that some manufacturers are using them for a more adaptive downsizing.

[Stuart English]

Stuart, there's got to be a more intelligent method than blind low-pass filtering for downsizing to SD to remove such aliasing (talking not particularly about monitors, but more regarding the issue of downsizing to SD).

Thats true Joofa. I was just using this as an example, and I described the interlaced TV monitor problem as that's what most people are going to watch SD on. The point is you need to tailor the information to the visual medium that is used to present that - if you provide too much detail then it WILL alias.