CC 608 with MCC comes in randomly aligned

I changed the format from Roll Up-2 to PopOn and exported a Quicktime file with embedded captions, and the captions move up, down and shift horizontally too.

One more note here... I exported a Quicktime file with embedded 608 captions, and the captions that I moved up -180 will randomly move down and back up 10-20 or so, when viewing in Quicktime. So those values I see in Premiere when exporting the MCC and seeing them change when the MCC file comes back in... I see them also moving up/down in the Quicktime file with captions turned on. So Premiere is writing them oddly no?

Here's what the settings are before exporting. The Zone is set to the bottom left, the horizontal and vertical size are zeroed out, and the x is set to -180.

Now after exporting the MCC and re-importing it, the captions now have different values here... and are randomly centered vs left aligned...

Thanks, @Stan Jones. We are using MCC since it seems to be the only format to export and import position data and share among the team for programs. Since there are ads we are working with, one person adjusts positioning while the other is assembling. Also, Aberdeen requires MCC files for delivery and distribution on their end.

I think it's either Premiere exporting with incorrect positioning data, or it reads it and doesn't apply it correctly in the timeline. I think it's the second, since the 708 stream seems fine most of the time, and Aberdeen hasn't mentioned this issue back with us. So Premiere messes up reading all those values when importing and adding into the timeline? That's my guess.

@DaveChap,

Thanks for the info. 

I don't test .mcc often. The files are inscrutable, and do not import to my favorite SubtitleEdit. So here for testing, I just exported from, and imported back to, PR.

Upvoted the bug report. Bottom line, there are so many oddities in timing, position on screen, alignment, that I cannot sort out easily what is even right or wrong.

As a workaround, I would consider using something other than MCC for the export/import to editor. Is there a reason you are using MCC? Is it your final deliverable?

SRT is not a candidate since PR does not export or import it with positioning. And SCC is not, since it is 608 only. I'd look at EBU/XML.

Stan

Well not all are on the latest patch, and some are on 14. But the issue persists from Premiere Pro 2023-2025. It's been an issue.

We are all on Mac. Latest OS (15.6.1). To export, we are doing file > Export > Captions, or right-clicking the sequences and exporting captions there.

For vertical adjustments, we first do the bottom left corner and everything is at 0,0. Then later in the program, we use the vertical input (x) and make the adjustment for a selection. -170 to -180 depending.

@DaveChap,

I'll try to test this, but a couple questions.

How are you exporting the MCC? File -> Export -> Captions? or with an export file?

How are you making the vertical adjustments? by zone or smaller adjustments?

Mac or PC?

Stan