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Geoffrey Beane
Known Participant
October 1, 2025
Question

Generative extend and 1.0 aspect ratio

  • October 1, 2025
  • 1 reply
  • 141 views

I tried using Generative Extend without success. I received an error message that said: "Generative Extend requires clips with a 1.0 aspect ratio."

 

I'm using Canon HD footage. MP4s. Seems like pretty standard stuff. But I went to my source clip in the Project panel, then did Modify>Interpret Footage and sure enough, under pixel aspect ratio it appears that the ratio of my pixels are 1.007. 

 

Who knew. Anyway,  I then selected Conform and chose "square pixels (1.0)".

 

I went back to my sequence. No deal.

I tried dropping the footage, fresh, into the sequence. No deal.

I tried making a brand new sequence with just that clip. No deal.

I tried restarting Premiere. No deal.

 

When I went back to my source clip after restarting, it says the clip is conformed to square, BTW.

 

Disappointed! 😞

 

If anyone has thoughts (in other words an Adobe employee, most likely), please share! 

 

(And in the future, do I need to be asking my camera guy to make sure he has some setting on his Canon to ensure square pixels? I thought only older footage, like SD wasn't square and that anything current was automatically square...but I'm just a dumb producer who doesn't know tech stuff, so I'm probably completely wrong!)

 

Thanks.

 

If anyone can give me other ideas, I'd be grateful.

1 reply

Warren Heaton
Community Expert
Warren HeatonCommunity Expert
Community Expert
October 17, 2025

Hi, @Geoffrey Beane:

 

Are these clips 720-by-486?  If so, I would use After Effects to transcode them to 648-by-486 Square Pixel and then import those into Premiere Pro.  Depending on the indended use, I'd go with ProRes 422 LT or ProRes 422 HQ for the compression type.

G
Geoffrey BeaneAuthor
Known Participant
October 18, 2025

Hey Warren - no, the footage is 1920x1080. I ended up doing a version of what you suggest. I took the clip, put it in it's own sequence in Premiere and then exported it as an mp4. When I imported that clip back into Premiere, Generative Extend did work.

 

It worked, but not really. It was the end of a sound bite with a woman on camera. I wanted her to sit on camera a beat more without saying anything, just to make the cut to the next clip a little less abrupt. But when I did generative edit of an extra 30 frames, it assumed I wanted her to be talking! So her lips started moving randomly. 

 

Kind of the opposite of the effect I was going for!!

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