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FORUMS Post Processing, Marketing & Presenting Photos Video and Sound Editing 
Thread started 21 Apr 2011 (Thursday) 19:34
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Using PTLens on video

 
Chippy569
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Apr 21, 2011 19:34 |  #1

http://www.youtube.com​/watch?v=ekXZhLQT20M (external link)

I got a Rokinon/Samyang 14mm/2.8 and one of the drawbacks of the lens is the uneven distortion. Luckily, there is some software, PTLens, that corrects this distortion (along with just about every lens/body combo you can imagine!) but does not work on video. As far as I am aware, there is no similar lens correction video filters for $25, so it came time to get creative.

I shot a quick 5-sec clip to test this with. Shot on a D7000, 1920x1080p24. I then opened the clip in Quicktime 7 Pro, and exported as an image sequence. Make sure to export to a unique new folder.

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Then, open PTLens. On the top right, hit "Directory" and navigate to the folder you made that now contains a ton of sequentially-numbered images.
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Select one image, and then under "Barrel-Pincushion" make sure the camera and lens are correct. Finally, select all and hit "Apply." It will now save all your images with a "_pt" extended to the filename.

Now, go back into Quicktime 7 Pro and open your now-corrected files as an image sequence.
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Then, export using the settings in the post linked in my sig.

Things that didn't work so well:
1. There's a noticeable color shift. I think this might have happened when I exported from movie to JPEG. I wonder if TIFF or some other format would be better.
2. It should be noted that video is really a crop out of the center of the sensor, meaning video is really more like a 1920x1080 crop from any resulting image. I'm not sure how PTLens handles this.
3. I wish PTLens would have the ability to output to a new folder.

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How to export to Youtube HD from Quicktime

  
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tricky500
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Apr 21, 2011 23:26 |  #2

I was wondering if this was possible. Good info, thanks for posting. Now I only need to buy the lens and learn how to edit vid in general :) Gotta sell my motorcycle stat!


- Paul

  
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Chippy569
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Apr 22, 2011 00:04 |  #3

Lol. I'd say for the shot I made, the correction was minimal and rather unnecessary really. But ocassionally it might be just the trick.


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Terjay
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Apr 22, 2011 00:40 |  #4

There's also straight up video lens correction filters available for After Effects.




  
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Chippy569
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Apr 22, 2011 07:12 |  #5

Terjay wrote in post #12270293 (external link)
There's also straight up video lens correction filters available for After Effects.

I figured as much, just didn't want to spend the time finding them nor the money to buy them as I'm sure they aren't cheap.


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Using PTLens on video
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