Scale to frame size not working properly. 50.0% to 50.1%

[#1]

I am having an issue when attempting to import 4K footage onto a 1080p timeline/sequence.

• Default media scaling is "Set to frame size" in Preferences > Media
• When footage is scaled to 50.0%, it distorts showing transparent sidebars, when scaled to 50.1%, it resolves.  Scaling back to 50.0% distorts again showing transparent sides.
• Does the same thing after unchecking and rechecking Uniform Scale
• Does the same thing when right clicking the clip and clicking "Set to frame size

When dragging in a 4K clip, the default scale sets to 50% (which is correct), but the image is distorted. I've been just setting the scale to 50.1% which resolves the issue, but that is quite tedious. Any insight would be appreciated.

[#2]

I am having an issue when attempting to import 4K footage onto a 1080p timeline/sequence.

• Default media scaling is "Set to frame size" in Preferences > Media
• When footage is scaled to 50.0%, it distorts showing transparent sidebars, when scaled to 50.1%, it resolves.  Scaling back to 50.0% distorts again showing transparent sides.
• Does the same thing after unchecking and rechecking Uniform Scale
• Does the same thing when right clicking the clip and clicking "Set to frame size

When dragging in a 4K clip, the default scale sets to 50% (which is correct), but the image is distorted. I've been just setting the scale to 50.1% which resolves the issue, but that is quite tedious. Any insight would be appreciated.

[#3]

Set to frame size is working fine for me with 4K to HD. Do your clips have non-square pixel aspect ratio? 

[#4]

I am not sure how to tell if my clips have a non-square pixel aspect ratio.  All footage was shot on a Sony A7iii.  Footage in 1080p renders correctly on the timeline, 4k footage distorts until the scaling is changed to anything >= 50.1%, then it renders properly.

[#5]

This issue has been reported a couple of times of the past week.

Workaround is to set clip to SCALE to Framesize.

[#6]

Thanks Ann, but scaling and setting to frame size is not a workaround.  They achieve two completely different outcomes.  Knowing that the issue has been reported several times is reassuring however.

[#7 · Accepted solution]

**** SOLUTION ****

I started my project by creating a new sequence using HDV 1080p.  This sequence is not 1920x1080, but rather 1440x1080 (should've paid closer attention).  Creating a new sequence with the correct dimensions of 1920x1080 resolved the import issue.  Hopefully this helps others searching for the same topic.

[#8]

Yep, I suspected that the issue is somehow related to non-square pixel aspect ratio used somewhere