Having a glitch when exporting

Question

Hi there,

I'm experiencing a weird issue when exporting a sequence.

I'm making a video of the year-end school performance of my daughter I shot last Christmas.

Everything is fine, except for the introduction sequence I'm making using a stock background video found on YouTube: it's basically a little shooting star moving across a red background.

For a nice effect, I'm using a black mate mask with opacity at 0 only around the little star and tracking it, with stereo effect of a glitter sound.

This happens three times before the mate mask reveals the whole imagine.

And it's precisely at the third occurence happening at around 00:00:08 to 00:00:09 that there's a glitch after exporting.

Weird thing is that there's no glitch for the two previous ones, and yet it's the same thing happening on the screen.

It's worth noting that the stock footage is 25 fps and my export is 60 fps, because I shot the whole school performance at 60 fps for smoother movements.

As for export settings, I'm using H264 codec with 2 pass variable bitrate set to 20 and 60 max, key frame pacing to 60 and time interpolation to optical flow.

All the export is nice, except for this glitch.

If someone has some time to take a look, here's a link to the project and the exported sequence showing the glitch: http://gofile.me/5CWqe/0ZHEiL99L

Thanks in advance!

Joost van der Hoeven · Accepted Answer

Thanks for providing the project and media. I see that the artifacts are already in the original stock animation. When the "comet" enters the screen from the top, it is already blurred and compressed. Fixing the Keyframe Distance to 60 or higher will force the compression to use the first "apprearance" and that one is not at good one. (see my screen grab, this is actually in the stock footage)
This is not a bug. In short: your source footage already has these artifacts and these are aplified with the export setting your are using.

Joost van der Hoeven · Answer

Hello @chris_3459 ,This looks like a h.264 compression artifact to me. Try these two options:1- Uncheck the Keyframe Distance option and let Pr choose it2- What happens when you use the default preset: Match Source - Adaptive High Bitrate?

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