Horrible Compression Artifacts Upon Export

Forum|Forum|4 years ago
June 14, 2021
3 replies
8990 views

Hi there!

I'm astonished at the clear difference between my timeline monitor and the export preview window.

You can see a drastic difference between what will be exported and what I was working on in the timeline. Does anyone have any info as to what is causing this?

I have maximum bit depth selected in my sequence settings.

This topic has been closed for replies.

Correct answer Phillip Harvey

I would also uncheck the Max Render Quality checkbox. It doesn't seem like you're scaling and it's possible that you're even introducing issues with that checkbox. You may try the same with unchecking Max Bit Depth (Are you using 32-bit effects in your sequence? Or have high bit depth source media?)

You can also increase your bitrate a little bit, like try 15/20 rather than 10/12, or even higher. In general, compression is going to block together like colors and it's going to struggle with a tightly knit pattern like that road with only subtle differences in color. Higher bitrate would help mitigate it.

Warren Heaton

Community Expert

It looks like compression generation loss. Is the source footage MP4?

Even if your source footage is 1st generation MP4, it can fall apart completely upon export.

Do you know what bit rate the source footage was shot at? Ideally, it's 21 Mbits/second or better. Low-end professional starts at 35 Mbits/second.

Also, consider an editing workflow where you transcode 1st generation MP4 to something that's good for editing like ProRes422 LT. You'll also be taking advantage of Smart Rendering in Premiere Pro (things will be faster).

willb36161674Author

Participant

Hi Warren,

No this was shot in Apple ProRes 422.

I figured out what Premiere was doing (and fixed it) but I thought I'd reach out anyways!

Thank you!

C

Counter23083686qm4b

Participant

You have to give us some information before we can even begin to guess. Might be easier to start a new thread, too.

We need to know the original media, frame-size/rate, and roughly the Mbps, so we know how much media per second is there to begin with. Then your timeline settings for frame-size/rate, and your export settings.

Screen-grabs dragged/dropped onto the text reply box are very helpful to get all that information quickly and accurately into the post.

Neil

With that,

My source clips are 4K 10 bit. Below are my sequence settings and my export settings:

P

Phillip Harvey

Correct answer

Community Expert

I would also uncheck the Max Render Quality checkbox. It doesn't seem like you're scaling and it's possible that you're even introducing issues with that checkbox. You may try the same with unchecking Max Bit Depth (Are you using 32-bit effects in your sequence? Or have high bit depth source media?)

You can also increase your bitrate a little bit, like try 15/20 rather than 10/12, or even higher. In general, compression is going to block together like colors and it's going to struggle with a tightly knit pattern like that road with only subtle differences in color. Higher bitrate would help mitigate it.