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How to convert HD 1080i to XGA (1024 x768)

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Allan Hughes
How to convert HD 1080i to XGA (1024 x768)
on Sep 26, 2011 at 8:51:09 am

Not an ideal situation to be in but a workaround for a possible hurdle I may have to tackle for an upcoming exhibition.
Gallery has only got older kind HD ready plasmas with 1024 x 768 XGA type display with rectangular pixels. My video is 1080i and I want to have the option to re-encode rather than have the receiver box for the screen do it. My video is running of Roku Brightsign 410s
Can anyone suggest a workflow to create a suitable H.264 MP4 out of Final Cut Pro 7 that would work in this instance. I'm guessing there's probably something simple like not selecting 'preserve aspect ratio'and to just re-size that may do this but I just wanted to make sure.
Thanks,
Al


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Bill Hall
Re: How to convert HD 1080i to XGA (1024 x768)
on Sep 26, 2011 at 8:27:35 pm

Why don't you create a new timeline based on the settings of the monitor. Copy and paste your project into that timeline. Adjust one of the pieces of video to where it looks correct and copy and paste attributes.

If you have a bunch of media and it's not cuts only your best bet might be to export quicktime conversion mp4. Make a custom frame size and set the preserve aspect ratio to crop.

I'd be interested to hear how you solve this though. Let us know.


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Allan Hughes
Re: How to convert HD 1080i to XGA (1024 x768)
on Sep 27, 2011 at 8:19:10 am

Thanks for the reply. I want to avoid cropping the image, while the screens pixels are 1024x768, they're rectangular so the screen itself is 16:9, just like my 1080i. If we get better screens then I'll not get to test this out. I exported the video via 'Quicktime Conversion' to an H.264, resizing it to 1024x768 and unchecking preserve aspect ratio. The video is all there, nothing cropped, but it's squished up into 4:3. If it works the rectangular pixels should re-shape the image to 16:9. I'll let you know if I get to test it.


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Bill Hall
Re: How to convert HD 1080i to XGA (1024 x768)
on Sep 27, 2011 at 12:46:46 pm

I guess I didn't read the original post properly. What you want to do then is export a video with non square pixels. Compressor is calling the aspect ratio you want to use .75 but I've also seen it as 1.3333.

It seems like unchecking preserve aspect ratio would work. What is your origanl footage? 1080 i HDV should be 1440 x 1080. That is the proper pixel aspect ratio.

It may play back in 4x3 during play back on your mac but test it out on the monitor. You will need software that understands non square pixels.

Sounds like you are on the right path.


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Allan Hughes
Re: How to convert HD 1080i to XGA (1024 x768)
on Oct 4, 2011 at 1:44:37 pm

I've not heard back from the gallery yet re. the monitors so will wait and see. My original footage is 1920x1080i.
I unchecked 'preserve aspect ratio' and made some exports. I'll see how it goes.


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