C100: clips inexplicably interlaced with strange motion

E

Erick Stoll

Member
Hey All,

I'm shooting on a C100 in 24p (23.98) 1080p. Several shots I took recently look very strange--weird, 'slow' movement, and seem to be interlaced.

I uploaded this clip as an example: https://www.youtube.com/watch?v=cgD1RZdT7wk&feature=youtu.be

You have to load it in 1080p to see the interlaced problem.

There's no way the camera settings were changed in this time, and the shot immediately before and after this look fine. But it isn't the only shot on the card like this, there are at least 4 or 5 others, maybe more. The card is a 64gb Sandisk extreme pro, and I filled it completely before dropping the footage.

Any thoughts on why this happened, and if these shots can be saved?

- E
 
Erick,

It sounds like you might want to check out this article by Matt Davis.

The AVCHD Codec captures 23.98 in Progressive Segmented Frames, so essentially the progressive frame rate wrapped in an interlaced package.

It seems for some reason NLE's cant differentiate between a PsF (a progressive clip in an interlaced package) and an actual interlaced clip of AVCHD footage from the C100.

So if your NLE is not setup to recognize the clip as progressive, it may try to deinterlace it and you'll end up getting some of those "interlaced" artifacts depending on the type of movement in your frame.

Allan Tepper has written a 10 Part article detailing PsF on certain cameras and NLE systems, here is Part 1: http://provideocoalition.com/ateppe...ow_em_part_1_benign_psf_versus_malignant_psf/
 
In which type of project you worked with 23.98fps, at 25p or 50i? Can you uploud a short orig clip?
 
Macaholic said:
Erick,

It sounds like you might want to check out this article by Matt Davis.

The AVCHD Codec captures 23.98 in Progressive Segmented Frames, so essentially the progressive frame rate wrapped in an interlaced package.

It seems for some reason NLE's cant differentiate between a PsF (a progressive clip in an interlaced package) and an actual interlaced clip of AVCHD footage from the C100.

So if your NLE is not setup to recognize the clip as progressive, it may try to deinterlace it and you'll end up getting some of those "interlaced" artifacts depending on the type of movement in your frame.

Allan Tepper has written a 10 Part article detailing PsF on certain cameras and NLE systems, here is Part 1: http://provideocoalition.com/ateppe...ow_em_part_1_benign_psf_versus_malignant_psf/
Click to expand...

Thanks for the response, but I don't think this it! I've been working in Premiere for a year and a half now with the c100, and have never had this happened before. It is a timeline with literally of other shots from the same card that view fine. It is only this clip and several others that look like this. Also, when I open the clip in VLC, or in FCP through log and transfer I have the same problem.
 
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