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How to avoid scaling twice after rotation?

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Peter WuHow to avoid scaling twice after rotation?
by on Jul 18, 2016 at 4:10:54 am

I have to rotate a video by 1.1 degree because it is not level. Then I zoom in to 103% to crop out the black corners.
The source is HD 1920 x 1080 and the output encoded video is 1536 x 864.
This results in the video being scaled twice, first from 1920 x 1080 to 103%, then to 1536 x 864 during encoding.

Is there a way to make only one scaling operation to reduce the blur introduced by scaling?

I'm using premiere cs4.


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Dave LaRondeRe: How to avoid scaling twice after rotation?
by on Jul 18, 2016 at 4:34:15 pm

1536 x 864 is a mighty strange dimension for video. What are you delivering?

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Alan LloydRe: How to avoid scaling twice after rotation?
by on Jul 18, 2016 at 5:24:01 pm

Export the rotated and slightly up-resed clip to something comparatively "lossless" and use that.

Lagarith or CineForm, maybe, at a good high bitrate, and possibly (depending on the content) a touch of sharpening applied should help.

And yes, as Dave comments, your export dimensions seem somewhat unusual. What's the output headed for?


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Peter WuRe: How to avoid scaling twice after rotation?
by on Jul 18, 2016 at 6:03:28 pm

It's for youtube. I don't want to upload the full 1920x1080 for several reasons:

- I want a smaller file size than HD so the upload go faster
- after rotation, the video no longer has 1920 x 1080 effective resolution so why waste the file size and give false expectation to audience

1280x720 is probably a more common resolution, but is a little too low so I pick something in the middle. Is there a better choice?


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Alan LloydRe: How to avoid scaling twice after rotation?
by on Jul 18, 2016 at 8:06:07 pm

Does YouTube even have a 1536 x 864 setting? (I have not seen one.)


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Tero AhlforsRe: How to avoid scaling twice after rotation?
by on Jul 18, 2016 at 8:12:57 pm

Just use standard resolutions like 720p. You're not gaining anything from that weird resolution.


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Dave LaRondeRe: How to avoid scaling twice after rotation?
by on Jul 18, 2016 at 8:14:07 pm

I'd stick with 1280x720. Youtube's going to re-compress the upload anyway, and it may turn out funny-looking with your current dimensions. A lot of codecs work well only with standard dimensions.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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