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Question

Weird bug (noise line at bottom of some video clips)

Forum|Forum|7 years ago
September 17, 2018
5 replies
1568 views

I've already searched a lot here and on the web and didn't find anyone with this same problem, so here it is:

when editing (Premiere Pro CC 12.1, MacOS 10.13.6) some clips shows a strange kind of "coloured white noise" line at the very bottom of it.
I first saw them at program window, but when I click on the those clips on Program to open on Source window, it's also there.

I tried some things: re-import footage on same project; exclude and re-import on same project; close this and open another (new) project) and the same happens.

When I export these lines also appears, but when I open the raw footage on other softwares, no lines there.

Tried cleaned all cache files, restart the computer and still there...

Based on this, looks like Premiere is creating some information related (metadata, XMP?) to affected clips, so once appears, ever appears.

This is happening on random clips, as long all the footage was recorded using same equipment (DSLR, h264 MOVs).
Post-production workflow is also the same. No effects or plugin applied, just raw files thrown on timeline.

It's the third project this happens.
The workaround I'm using is scale the clips a little bit, so the lines goes off screen.

But I really like to fix this.

Any ideas?
Thanks!

This topic has been closed for replies.

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rodneyb56060189

Legend

I don't know what to suggest. I got same SD card specs and that should be fine for you.

The full vs. limited thing I mentioned is just output range ( has to do with clipping blacks and whites) and I have my camera set on limited, but that should have no bearing on your problem.

Since your problem is intermittent there's no way to 'test' stuff with a little video file and share that with others to see if they get the same weird stuff in their copy of PPro… cause you would have to share the original and NOT an export from PPro, which might be introducing the weird stuff.

If there WAS some way to share a really really small video file that is giving you the problem ( like 1 second at 24fps would be more than enough ), then I'd do that. Let others put it into their machines and see if they get the same weird stuff.

That at least would maybe whittle it down to camera problem vs. computer hardware problem ( graphic card, drivers, etc. )

I agree, if it's baked into the camera original file I would guess you would see it before going into PPro.

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rodneyb56060189

Legend

probably stupid question, but is the firmware in your camera up to date ? I have no clue what camera you are using, but there's usually an easy way to update that stuff.

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rodneyb56060189

Legend

Looks kinda like macroblocking, like the card speed and compression being fed to it can't keep up with the bandwidth or something. Like, on some shots the info can't get fully onto the card before it has to quit that frame and start the new one.

beats me. Never saw this before.

I guess you're formatting the cards in camera and all that stuff.. and since it's intermittent it's hard to figure out. Like some shots are good off the card and some are not ( off same card ).

very weird.

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bagadefenteAuthor

Participating Frequently

Never heard of this "macroblocking" thing... but at first seems a possibility.II

But if it was this, the video file should shows these lines even on finder/explorer, not just when import to Premiere, right?

About the card, I use a SDHC Class 10.
I usually delete the files on my mac after copy to an external drive, but sometimes, during shooting, I formar on camera.

My camera is a Canon T3i.
I have Magic Lantern installed, and I believe this one and the oficial firmware are update to date, but tomorrow I'll confirm this.

Once again thanks for all your inputs!

P.S.: and sorry for some mistakes on my writing; English is not my native language.
=)

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rodneyb56060189

Legend

I'm just guessing off top of head.. but I use a Nikon d800 DSLR and there's a couple things for me personally. I record out of HDMI to atomos and don't use the SD card. But there's settings in the camera which are NOT WELL documented in the Nikon Manual.

For example, if I leave SD card in camera while going out to HDMI the result is limited to 720p. So the manual is WRONG.

Off top of head, there are other settings having to do with LIMITED or FULL … but for life of me I can't remember right now what the heck that referred to....

I'll look into it by getting out camera from closet and look at the settings, but it's basically similar to Canon stuff I think.

My gut feeling is that is what you are seeing, cause everything else looks like it should be cool.

Good luck !

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rodneyb56060189

Legend

probably good idea to post screen shot of your source video using mediainfo or something. So everyone knows how your video is from the DSLR. The tree view of media info is the most effective way to share the info, but maybe mac has similar info available somewhere.

Then post screen shot of your project or sequence settings.