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Weird problem in Premiere pro – rendering and transcoding causes pixelation
Hi – long time lurker, first post 🙂
The past few days I have been going insane over a weird issue that suddenly appeared as the attached screen should show.
I am working on a stop-motion/timelapse sequence and I have not noticed this problem before.
To the right you see the preview from the timeline after a full preview render, to the left, the original clip.
Any ideas as to what might cause the pixelation?
I tried everything I could think of: Different resolutions, removing all effects, rendering preview in max quality but the result is the same. As soon as I change a parameter (and the green bar turns yellow or red, the pixelation goes away..
The stills are imported as a sequence.
I will try to think of more experiments and tests as I realize that this might be too vague for you to help me but I spend all day with zero progress and I am getting rather stressed (the project is already past deadline :))
EDIT: Ok, it does NOT appear to affect the final render 🙂
Also, I oppened a new project and re-imported the images as a sequence and the behavior is the same. However, if I import only ONE image, the phenomenon does not occur.
I guess I CAN finish the project like this if I have to but it is very frustrating still 🙂
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6 Replies
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Any chance you could post one or two of these source frames so we can try mucking aout with them in Premiere?
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I am not sure about how to do that in a productive way. When I only import a frame, then the problem does not occur
hmm, maybe I’ll throw a bunch of them on dropbox, but it’ll take some time as I have pretty slow upload here -
I am not sure about how to do that in a productive way. When I only import a frame, then the problem does not occur
hmm
EDIT:
Here a go 🙂https://www.dropbox.com/sh/9bd27w5r1r8qhx1/MvsDlu8LZe
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oups, sry bout the doublepost..
Daylight broke me loose and brought me back
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So the problem appears to be that the default Preview codec that Premiere uses, which they call “I-Frame only MPEG” doesn’t correctly compress the grain in your photos. These were shot on film, am I right?
There are two solutions:
1) Live with it. Since it’s a problem with the preview codec it doen’t affect the final output (as you discovered.)
2) Change preview codecs. On Windows, your options are limited to various flavors of DVCPRO HD, which work fine but leave the image looking soft. (Unless you have Cineform or another AVI based codec installed.) On mac, however, you have every Quicktime codec at your disposal. If you have ProRes installed, go ahead and use that. Avid DNxHD also works, which can be downloaded for free.
To change preview codecs you may have to create a new sequence and copy everything from the old one to the new.One question though: Why are you rendering preview files? I have no trouble with playback on my 5 year old MBP, though admittedly I do have an SSD installed in it.
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Thanks for the reply John.
I tried playing with the preview settings, but it didn’t seem to have any effect. Can you recommend any free codecs for this use?
[John-Michael Seng-Wheeler] “Why are you rendering preview files? I have no trouble with playback on my 5 year old MBP, though admittedly I do have an SSD installed in it.”The ability to playback live seems to vary greatly.
I am starting to worry that I have hardware or software issues.
I am on a 5 months old Thinkpad W530 – QuadroK2000M 2GB with 32GB DDR3 and 2x 256SSD running CS6 “hacked” for CUDA support.I assume there must be a general thread here dealing with benchmarking and such? Maybe even a benchmark project for download?
My OS came pre-installed from a “student-discount-retailer” in germany and you never know how they might have bloated the OS install.
Are there any codec packs that one should stay away from? It suddenly occurs to me that I installed the CCCP codec pack a few months back in a white-night anime frenzy 🙂Last thing, a month ago some idiot sat on my laptop for almost 30min before I took notice and whereas the machine seems fine upon inspection, I am left with the nagging worry of bad connections.
I assume however, that problems such as the ones I am having wouldn’t likely be related to hardware issues?Meh, I am starting to spend WAAY more time on troubleshooting than on production 🙁
Daylight broke me loose and brought me back
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