Join Chris Meyer for an in-depth discussion in this video Tracking interlaced sources, part of After Effects Apprentice 12: Tracking and Keying.
- View Offline
Elsewhere in this course I've described this MRI computer footage as being…a progressive scan.…In other words, not being interlaced or not exhibiting fields.…Well, that was a little white lie, but it gives me an opportunity to talk to you…about tracking footage that is interlaced.…Let's move in time to a point where we have the fast motion in this shot,…probably when this woman is coming on screen like right around here.…If I Zoom in on this shot and pan over to her, I do indeed to see the telltale…comb teeth effect of interlacing.…
These horizontal lines being slightly offset from each other indicate that this…frame contains lines that occurred at two different points in time and therefore…are freezing the motion at two different positions.…Normally, I would advice separating fields on any interlaced source.…However, through experimentation I found that on this particular clip it does…not help, and I will explain to you why.…I'll go back to 100% Magnification and open up the Interpret Footage dialog for this clip.…
The After Effects Apprentice videos on lynda.com were created by Trish and Chris Meyer and are designed to be used on their own and as a companion to their book After Effects Apprentice. We are honored to host these tutorials in the lynda.com Online Training Library®.
- Understanding motion stabilization and keying
- Performing a track
- Applying tracking to effects
- Keying with KEYLIGHT
- Replacing images
- Improving the composite
- Garbage masking
- Dealing with interlaced footage