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C100 - Digital artifacts showing up. Can't explain it.

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Tangier Clarke
C100 - Digital artifacts showing up. Can't explain it.
on Feb 28, 2017 at 11:04:20 pm
Last Edited By Tangier Clarke on Feb 28, 2017 at 11:23:12 pm

Folks we've been using C100's on shoots and we keep coming up with footage that has digital artifacts in. We can't seem to nail down the cause. If anyone has seen this happen and has some insight please let me know. Here's what we do know:

- Artifacts show up in Quicktime, FCP X (10.3 and previous version), VLC, any media player I've tried.
- When playing footage forward we don't see them (rarely). Playing them in reverse seems to show them much more.
- We're using macOS Sierra. Problem existed pre-sierra as well.
- The digital artifacts will still show up on our ProRes 422 exports.
- We generally qualified SDHC media by SanDisk.
- Frame rates are primarily 23.98.
- Some shoots we never see these artifacts and then suddenly they'll appear. It's inconsistent so we can't pin this down.
- Seems to be more prevalent in low light shoots, but not exclusive.
- We offload our cards (rewrap not transcode) using EditReady (KYNO testing in progress)
- The artifacts show up in the original , but not the proxies we make in FCP X.
- We've retired cards thinking it's the cards, but it still shows up on relatively new cards.
- It's showing up in both cameras on a multicam shoot, but not necessarily at the same moment for camera A and B.
- One C100 is new than the other by well over a year or two.

Any insight would be really appreciated.





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Chris Wright
Re: C100 - Digital artifacts showing up. Can't explain it.
on Mar 2, 2017 at 9:03:22 pm

"The artifacts show up in the original , but not the proxies"
have you heard of the holmsian method?

you need to first isolate if its the computer or the camera. find someone who has a working c100 AND computer and
swap out their test footage with yours.
1. if their footage works in your computer, its your camera/card
2. if their footage doesn't work in your computer, its your computer.

...then go from there. smaller and smaller till you find the cause
i.e.
1. record camera with his media. if it works, its your card(if his media works in your computer), if not its your camera.
and so on, and so forth working with a known 'good' will help you isolate the variables.


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