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Bill Shupp
Inspiring
December 4, 2018
Answered

Kaleidoscope Sequence showing border lines on export only

  • December 4, 2018
  • 1 reply
  • 453 views

I'm working on a kaleidoscope style sequence, and while it looks fine in my timeline, I sometimes see a horizontal and/or vertical line on export.

Here is a screen shot from the program monitor where it looks correct:

Here is a screenshot from the export window (it renders this way), where you can see a horizontal line through the center:

Some technical details:

The sequence is 1920x1080 HD.  It has 4 layers, and as far as I can tell I have the correct settings for a clean set of "mirrors".  Each layer has the same source HD sequence at 50% scale.  The positions are as follows:

  • Top left layer: 480, 270
  • Top right layer: 1440, 270
  • Bottom right layer: 1440, 810
  • Bottom left layer: 480, 810

The horizontal and vertical flip effects are applied accordingly.

The source HD sequence has a much larger video source (5472x3648), and some scale/zoom keyframes are applied for motion.  The source video was encoded with Cineform.

Things I've tried:

  • I tried re-encoding the video source into ProResHQ (from CineForm, not from the raw files).
  • I've tried re-positioning the layers in the main sequence, 10 or 100 pixels, but the lines remain.

Interestingly, I have source materiel in another sequence that was shot UHD h.264, and it does not have this issue.  So I'm wondering if it's codec related?  I have 3 separate sequences that all have this issue (so far), and all were encoded from canon raw files into CineForm.  My next step would be to re-encode them with something else, but that will take a lot of time as stabilization and some other things have already been applied.  So I'm trying to nail this down before I re-do that work.

Any ideas are greatly appreciated!

Cheers,

Bill

This topic has been closed for replies.
Correct answer Bill Shupp

After further testing, I found that the above workarounds were not worth it.  I also found that After Effects has none of these problems.  Further, I was able to render successfully via a linked AE composition from Premiere Pro.  So that's the approach I'll be using going forward.

1 reply

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excited_Genie16B8
Legend
December 4, 2018

MPEG works best when both dimensions are evenly divisible by 8.  Work that into your scaling.

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Bill ShuppAuthor
Inspiring
December 6, 2018

Thanks for the response, Jim.  I did try altering scaling a number of ways, to no avail.

I've found two changes that get around this issue:

  1. Don't use the vertical flip effect.  Instead, use a combination of horizontal flip and rotation.  While this improves the situation, I still have very thin black lines vertically and and horizontally (like a plus sign through the image).
  2. To get rid fo the remaining black lines, I have to render the source HD sequence (that contains the larger video clip), and re-import it to use in the layering process.

While this is a workaround, it's pretty inconvenient.  Going to leave this open to see if anyone else has any ideas.

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Bill ShuppAuthorCorrect answer
Inspiring
December 8, 2018

After further testing, I found that the above workarounds were not worth it.  I also found that After Effects has none of these problems.  Further, I was able to render successfully via a linked AE composition from Premiere Pro.  So that's the approach I'll be using going forward.

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