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Question

glitching when fading in from black using keyframes.

Forum|Forum|7 years ago
November 12, 2018
3 replies
3917 views

I've noticed that on every keyframe opacity fade in I have a glitch at the start. Due to a different premiere bug related to encore authoring, my workflow is this:

Export high quality h.264

import that into premiere cc 2017

export that as lower bitrate h264

BOTH the high quality h264 file exported in cc 2018 and the lower bitrate version exported in cc 2017 have the same pixelation/glitch at the start and also at any point during where I fade in.

For example, at exactly 46 seconds on this when the footage fade in after the title. aimee + charlie / where our story starts on Vimeo

This topic has been closed for replies.

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davidpayne1981Author

Known Participant

ok so not remotely linked to the initial post but I'd just like to come back here to ask a question. Since your recommendation of using mpeg2 dvd export from the original high quality (now a DNX file) I've noticed the quality of my DVD footage has MASSIVELY improved so thank you for that.

My issue now is that my bluray footage is awful! It's fine, except for example 4k drone shots downscaled to 1080p timeline. They look fine on the 1080p USB file and also (now, thanks to you) on the DVD, but the bluray looks massively aliasy. Is that even a word? It flickers and looks awful anyway. Too much detail..

I use the h264 BluRay export. Am I doing this wrong?!

Averdahl

Community Expert

I use the h264 BluRay export. Am I doing this wrong?!

Post a screen shot of the of your export settings.

How do you downscale the footage on the timeline, Scale, Scale to Frame Size or Set to Frame Size? (Scale to Frame Size should be avoided.)

And, be sure to set the Multiplexer to Blu-ray. I use 25 or 50 frames per second so i choose BDMV, PAL. Choose BDMV, NTSC if you use 23.976/24/30/60 frames per second.

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davidpayne1981Author

Known Participant

yeah I'm a pal guy too but I have never even clicked the multiplexer tab before..

for dfownscaling the footage I just go to effects controls and type 50 in the scale box (to bring 4k footage down to 1080p). Would you say this is incorrect?

I even tried exporting the drone shot on its own as a 1080p file and re-importing it into the 1080p timeline so no downscaling was required but the aliasing and moire when burned to the bluray was even worse

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davidpayne1981Author

Known Participant

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davidpayne1981Author

Known Participant

thats mid way through a fade in, you can see the pixelation around the image. The problem is that it flickers and comes and goes as it fades in making it really distracting and noticeable and more like a glitch than just pixelation

Averdahl

Community Expert

The only way to fix this is to export an intermediate file from 2018 and then import and re-export in 2017.

Got it, but using H.264 as an intermediate is still a bad choice. Just saying.

I have seen similar compression artifacts in compressed outputs from Premiere Pro for years. I have not yet found a 100% way to reproduce it but it seems that the more whites in the image, the more artifacts in the output. The shorter the fade, the more artifacts. Both lots of whites and short fades=disaster.

The build in H.264/H.264 Blu-ray encoder in Premiere Pro has imho some flaws and most of the times a thrid party encoder does the job better. Download the free trial version of TMPGEnc Movie Plug-in AVC for Premiere Pro - Export Premiere Pro projects using the TMPGEnc H.264 encoder. and see if it does the job better. You can export to x.264 and x.264 Blu-ray. No watermark or other limitations in the trial version.

I use that plug-in myself and love it.

No matter what, forget about CineForm and use DNxHR/DNxHD instead. I had a similar issue a couple of weeks ago and the DNxHD were much better that CineForm in that situation.

Averdahl

Community Expert

For Blu-ray authoring you do not want to export as plain H.264, use the H.264 Blu-ray exporter instead. And, if you export H.264 and import into CC 2017 and then export to H.264 again you will indeed loose quality since H.264 is a heavily compressed codec.

If you really need to export a file to use in CC 2017, use a good intermediate codec such as CineForm or DNxHD and then import that file into CC 2017. From what application do you export the "high quality h.264"?

Can you post a screen shot of the pixelation? When i look at the video i cannot see anything out of the ordinary nor anything that sticks out as a glitch, problably because i don´t know where to look in the image.

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davidpayne1981Author

Known Participant

the high res h264 is because of a bug that was recently discovered meaning that if you export a h-264 bluray file from cc 2018 and try to author a bluray with encore, you get an error. The only way to fix this is to export an intermediate file from 2018 and then import and re-export in 2017. You're right though I should be using the highest quality export setting I can, but I only ever use h264 so I just went for that with maxed out bitrate settings. I'll try with a CineForm file but it wont fix this issue. I'll try to get a screenshot and post it

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