FORUMS: list search recent posts

Upres and preserve Alpha channel?

COW Forums : Apple Final Cut Pro Legacy

<< PREVIOUS   •   FAQ   •   VIEW ALL   •   PRINT   •   NEXT >>
Woody Brubaker
Upres and preserve Alpha channel?
on May 9, 2013 at 11:56:36 pm

I've got an SD video file (a transition) that I'm trying to run through compressor in order to upres it to HD and make it progressive. I know this won't make it look much better, but it's quick and I simply need it to fit the specs of my current project files. It's currently 720x480 animation codec, and I'd love to upres it to 1920x1080. The trouble is when I run it through compressor, I seem to lose the alpha channel. Actually, when I bring the recompressed file into FCP, it recognizes the alpha channel (when I examine item properties), but in my timeline, it ingores it.

Any thoughts?


Return to posts index

Shane Ross
Re: Upres and preserve Alpha channel?
on May 10, 2013 at 12:04:56 am

Use the Apple ProRes with Alpha option...that's ProRes 4444. That should do it.

Shane
Little Frog Post
Read my blog, Little Frog in High Def


Return to posts index

Woody Brubaker
Re: Upres and preserve Alpha channel?
on May 10, 2013 at 1:02:11 am

Okay, this seemed to work, but only if I have frame controls turned off. If I turn them on, say good by to the alpha channel. Unfortunately, with the frame controls turned off, the final file, once imported, comes along with all these nasty interlacing lines. I can't use it like that. Any other suggestions I could try?


Return to posts index


Shane Ross
Re: Upres and preserve Alpha channel?
on May 10, 2013 at 1:10:36 am

Where did this transition come from? Do they make an HD version?

Any decent method I know that will upconvert well and de-interlace, will also strip the alpha.

Look for other options...HD options.

Shane
Little Frog Post
Read my blog, Little Frog in High Def


Return to posts index

Woody Brubaker
Re: Upres and preserve Alpha channel?
on May 10, 2013 at 1:25:23 am

Thanks, Shane. Unfortunately, I can't just replace the transition with a different transition, as I'm in the process of re-editing an old prodction and I don't have the option of buying new footage or transitions.


Return to posts index

Rafael Amador
Re: Upres and preserve Alpha channel?
on May 10, 2013 at 3:54:11 am

[Woody Brubaker] " Unfortunately, with the frame controls turned off, the final file, once imported, comes along with all these nasty interlacing lines. "
So you are not properly setting the Interlacing control.
Is the Animation clip Interlaced or Progressive?
Do you want the upsized version (1920x1080) to be Interlaced or Progressive/
rafael


Return to posts index


John Pale
Re: Upres and preserve Alpha channel?
on May 10, 2013 at 4:18:45 pm

Not exactly ideal, but have you tried up converting the file but leaving it Animation Codec.
Is the Alpha retained?

If yes, then convert the upconverted Animation codec clip to ProRes 4444 in a separate pass.
Animation codec can be pretty lossless (apart from the upscaling), so the extra pass shouldn't really lose you any quality.


Return to posts index

Woody Brubaker
Re: Upres and preserve Alpha channel?
on May 10, 2013 at 8:31:18 pm

The clip is currently interlaced. I'd like it to be progressive. Every time I turn on frame controls to export a progressive version, the alpha channel is lost.


Return to posts index

Shane Ross
Re: Upres and preserve Alpha channel?
on May 10, 2013 at 8:51:25 pm

Yep...it will be. That'll happen no matter what you do to try to make it progressive. This is why I suggest you find an alternate transition.

Shane
Little Frog Post
Read my blog, Little Frog in High Def


Return to posts index


Rafael Amador
Re: Upres and preserve Alpha channel?
on May 11, 2013 at 4:13:59 am

Are you exporting with the "Millions of Colors +" option checked?
rafael


Return to posts index

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
© 2017 CreativeCOW.net All Rights Reserved
[TOP]