Sporadic pixalation errors

Forum|Forum|5 years ago
December 27, 2020
4 replies
703 views

Hi! I have noticed sporadic errors including sudden pixalation (pl. see example attached) after export of a music video - these errors are not visible when I play the video session in the time line in adobe premiere pro (14.7.0). It seems that there is an overlay of two clips but there is actually only one clip at the time of interest in the time line?! The export was performed with H.264 format (1920:1080) - the errors did not depent on render quality settings. I had these problems before indicating that I likely make any systematic errors? Tx in advance!

pixalation_errors.zip

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Steve Griffiths

Inspiring

Now that we know you are on Mac OS - don't worry about GPU Drivers. They are part of the MacOS installation and can't be changed.

Try 'preview' rendering your entire sequence before exporting and then - assuming no pixelation is present - export as per normal but ensure you tick the 'use previews' checkbox in the export window. This should then produce a usable export.

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TG-TONEWORKSAuthor

Participating Frequently

Tx Steve, I'm goin' to try these things and come back later to you...

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TG-TONEWORKSAuthor

Participating Frequently

... I have rendered with preview and no pixalation was observable - I exported with ticked "use previews" box, however, the pixalation re-occurred. Interestingly, when I exported only a small piece of the sequence, for example 15 secs where pixalation usually occurred, there was was no pixalation in the exported file?!?!? This may indicate that these errors depend on time and not location in the sequence - funny thing!? I have also tried different export settings (with and without max. render qual, different codices etc. - no success.

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Michael Grenadier

Legend

please tell us your source properties and sequence settings. By any chance are any of your sources from a smartphone or screen capture? If so, the issue is probably variable frame rate sources.

use mediainfo to determine whether your source is variable or constant frame rate
https://mediaarea.net/en/MediaInfo/Download
if it's variable use handbrake to convert to constant frame rate
https://handbrake.fr
and here's a tutorial on how to use handbrake
https://www.youtube.com/watch?time_continue=34&v=xlvxgVREX-Y

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TG-TONEWORKSAuthor

Participating Frequently

...indeed one short clip (4 secs) comes from iphone in full HD - I must admit that I did not care much about frame rate variances despite the clips came from many different sources (youtube stuff, videoblocks, canon camera etc.) - I thought that my settings included an automatic conversion of my imported material to the given frame rate setting of the sequence/project - 25 frames/sec!? Tx a lot for your advice and the link to handbrake website - I will check out this website!

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Michael Grenadier

Legend

unfortunately your sequence settings will not correct for variable frame rate sources. Adobe is working on this but I don't think anyone outside of Adobe has a clue as to when this fix might be implemented.

Ann Bens

Community Expert

Do these errors appear when MPE is set to software?

If so update or downgrade gpu driver.

Post comp specs and OS.

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TG-TONEWORKSAuthor

Participating Frequently

these errors do also appear when I set MPE to software. I am using a MACbook pro (mojave 10.14.6, 2.3 GHz intel core i9, 32GB 2400 MHz DDR4) equipped with radean pro vega 16 4GB and intel uhd graphics 630 1536MB. Which driver must be up/down-graded?