Garbled 4k R3D in Quicktime & RedAlert

[Jack James]

I have a 4k R3D file. When I open it in RedCine, everything looks fine. In RedAlert or in Quicktime (via the proxies in the latter case), the lower half of the frame is garbled (see attached pic) and pressing play crashes the app. Does anyone know what might be causing this? I have another take at 2k which is perfectly fine.

 

[Scott Simmons]

I've seen this same thing in certain clips as well. It must be a codec related thing but I've tried different versions of the codecs and still see the same thing.

 

[Gunleik Groven]

16:9....

Try shooting @ 2:1

Currently RC is the way for 16:9 (if you're not happening to have a Scratch suite hanging around...)

G

 

[Scott Simmons]

Can you expand on that gunleik?

 

[Jack James]

16:9....
Try shooting @ 2:1

Yes someone I spoke to mentioned this very same thing. Our first day of shooting is tomorrow, so we'll do a quick test at 2:1 and if that's ok, we'll stick with that. It wouldn't be a big deal not to go 16:9...

 

[Scott Simmons]

So obviously you're talking 2:1 aspect ratio and not a compression ratio. What is the technical reason a 16:9 image comes out all garbled like this? Is this all 16:9? Just 4K?

 

[Zach Hilton]

Yes someone I spoke to mentioned this very same thing. Our first day of shooting is tomorrow, so we'll do a quick test at 2:1 and if that's ok, we'll stick with that. It wouldn't be a big deal not to go 16:9...

2:1 is the way to go for right now. We've done extensive tests with 2:1 and it works just fine. I'm pretty sure all 16:9 will react the same (haven't tried 3k yet since we haven't updated to build 14). 16:9 isn't supported in Redalert, Quicktime proxies and thus Final Cut Pro. So, if you don't want to be forced to go through Redcine right now, then I wouldn't shoot 16:9. I anxiously await the day that 16:9 is enabled though since most of the stuff we shoot is 16:9.

 

[Jack James]

So obviously you're talking 2:1 aspect ratio and not a compression ratio. What is the technical reason a 16:9 image comes out all garbled like this? Is this all 16:9? Just 4K?

yes 2:1 is the aspect ratio. so far we've only encountered this issue with 16:9 4k. 16:9 @2k was absolutely fine. The problem is not related to what's recorded, is to do with the software on the playback end.

 

[Gunleik Groven]

RedCine handles 16:9, but then you'll have to render out your proxies manualy to something like prores before editing.

If you'd like to just start cutting, 2:1 is the way to go.

Gunleik