Blackmagic Forum

So I am about to start a project that is going to involve some heavy green screen work. What I really want to accomplish is to shoot RAW and eventually export a file at 2400X1350 to take into After Effects.. I spent a couple of hours experimenting with the different codecs available in Resolve and I am having a hard time figuring out a way to export a file that isn't 3 times bigger than my original.. Every Codec that allowed me to export at my preferred resolution tripled the file size and I would love to find something that could give me something a little smaller.. Are there any other Codecs that will work in Resolve that I could use?

I am on PC by the way and I try to avoid quicktime since it gamma shifts like crazy...

Whats wrong with using quicktime to output DNxHD? I would suggest outputting to DNxHD or ProRes at 10 bit, full res. You're file size shouldn't be triple of RAW....

*edit. Having said that...why don't you just bring your DNGs directly into AE? You can import them straight in....

sean mclennan wrote:Whats wrong with using quicktime to output DNxHD? I would suggest outputting to DNxHD or ProRes at 10 bit, full res. You're file size shouldn't be triple of RAW....

*edit. Having said that...why don't you just bring your DNGs directly into AE? You can import them straight in....

I believe 1080 is the highest you can go on DNxHD.. All the options are presets for 1080, 1080i, 720, etc.. at least that is what I recall.. I could be wrong.. I'll have to double check tonight..

I like taking my footage through Resolve since it's easy to isolate the green and tweak it to be a bit more pure green making for a little easier key..

Plus taking the footage directly in AE does work but you only get to see the first frame in camera RAW when tweaking the RAW settings.. I like to be able to scrub the footage to make sure there are any hotspots or other things that need to be tweaked..

you can use compressed file formats:

tiff (16 bits with compression)
EXR (16 bits with compression)

that will be lass than 3 times your data... However, if you start from compress data, your key might suffer nonetheless...

waltervolpatto wrote:you can use compressed file formats:

tiff (16 bits with compression)
EXR (16 bits with compression)

that will be lass than 3 times your data... However, if you start from compress data, your key might suffer nonetheless...

Tiff exports a 40GB clip when I used it.. The EXR gave me about a 30GB clip.. The original Black Magic RAW clip was about 11GB

It almost seems nonsensical that my export is 3-4 times larger than my original RAW footage...


Are you saying it's going to hurt my key if I use a compressed format out of Resolve? Maybe I just need to bite the bullet and buy more storage for this project.. then I can just export DPX and be done with it.. I would love to keep the file sizes down if I could though..

I'll play around with it some more when I got home tonight...

Thanks for the responses guys..

Brad Ballew wrote:

waltervolpatto wrote:you can use compressed file formats:

tiff (16 bits with compression)
EXR (16 bits with compression)

that will be lass than 3 times your data... However, if you start from compress data, your key might suffer nonetheless...

Tiff exports a 40GB clip when I used it.. The EXR gave me about a 30GB clip.. The original Black Magic RAW clip was about 11GB

It almost seems nonsensical that my export is 3-4 times larger than my original RAW footage...


Are you saying it's going to hurt my key if I use a compressed format out of Resolve? Maybe I just need to bite the bullet and buy more storage for this project.. then I can just export DPX and be done with it.. I would love to keep the file sizes down if I could though..

I'll play around with it some more when I got home tonight...

Thanks for the responses guys..

It actually make mathematically sense.

One of the most common bayer pattern is RGBG with the two "G" in the diagonals. this mean that for each of the 4 pixels (4x3rgb --> 12 units) you store only RGBG (4 units) giving a ratio of about 1/3 (assuming that the bit depth is the same AND there is no compression in the Bayer file)

http://en.wikipedia.org/wiki/Bayer_filter