14 thoughts on “Transcoding Anamorphic 2.8K ProRes

    • bradleyjandrew says:

      Hi Tony,

      Thanks for touching base. When I initially tackled this transcoding problem the original values specific worked perfectly to solve the black border issue, I used them on many jobs with no problems.

      It appears that something has changed either in the ARRI Image Processing or the way Resolve interprets it both when I compiled the assets for this post and over the past few weeks when I’ve been working.

      In the future when completing this transcode task please apply a scale of ‘1.023’ to the X and Y rather then the specified ‘1.059’. This will ensure a full frame anamorphic image with no black borders and no minor image cropping. I have verified this and confirmed that it works.

      Please let me know if you have any other issues!

      Regards
      Brad

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  1. andrew g says:

    Thanks so much for the detailed guide! I kinda got lost on the math, but you’re sure you need to re-size both the X & Y to get rid of the borders? Or should you just be stretching X? Seems to me that you shouldn’t need to do anything to the Y dimensions in an image that is just squeezed horizontally. But, after scaling up X & Y, it’s still a perfect 2:1 ratio?
    Thanks!!

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    • bradleyjandrew says:

      Hi Andrew,

      No worries at all, I’m glad that you found it helpful. You definitely need to resize both the X and the Y, if you just resize the X it will actually stretch the image slightly which would make it slightly distorted, proportions should be constrained when scaling up. I understand the point you are making but despite the black borders there is no way the images come out of the camera squashed or stretched. The native aspect ratio for the format discussed (Anamorphic ProRes 2.8K) is 2.66:1 which is usually cropped at the sides to make 2.39:1, so yes, if you scale up both X and Y you maintain that 2.66:1 Native Aspect Ratio.

      Thanks!

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  2. Chris says:

    Hi Andrew,

    Thanks for the timely walk through! We’re intending to use the camera original ProRes files to edit in Premiere and then take the finished edit to Resolve. From the looks of your workflow and applying it to Premiere, we just interpret the footage as 2:1 anamorphic and it will then be interpreted correctly? From my eyes it seems to be the case.

    Then it’s just a matter of scaling it in our sequence to fit? Like the other commenter I was also confused as to whether we should just be scaling the X axis.

    It looks like we’ll be editing it in a 2.39:1 sequence, so we will loose some of the image on either side anyway.

    Thanks Andrew!
    Chris

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    • bradleyjandrew says:

      Hi Chris,

      Thanks for reading and reaching out. Just for the record, my name is Brad, it often gets confused with my surname Andrew so all good!

      That sounds about right to me, if you’ve got fast enough drives and a decent system editing 2.8K ProRes natively in Premiere shouldn’t be a problem. As you say, if you shot anamorphic definitely run a 2x desqueeze and you should be good to go, your eyes will be the best judge. Just remember the native aspect ratio of disquieted 2.8K Anamorphic is 2.66:1, so if you framed for 2:39:1 you’ll need to zoom in 11.3% to ensure what you see in Premiere matches what you shot, then you’ll have left to right racking room for corrections. Or setup your sequence for 2.39:1 which is sounds like you have done.

      Keep in mind that the aspect ratio scaling mentioned above is different to the black border scaling. Different softwares handle the black borders differently. If you open the files in Quick View or Quicktime on Mac you won’t have black borders, but you will in Resolve. You’ll get different results if you playback in Silverstack, Premiere, VLC, etc. and it also depends on what version you are running. If cutting natively in Premiere and you don’t see any black borders then you shouldn’t need to scale to correct this issue.

      To understand the uniform scale for the black border you need to look at some specs. The camera shoots at ‘2880 x 2160’ but displays in the Quicktime Container at ‘2944 x 2160’, this indicates that we only need to scale the X Axis, but when you look at the desqueezed image in Resolve circles still look like circles, and I’m confident the black border is around the entire image despite not being able to see it as it blends with the slug of the 2:66:1 Aspect Ratio. There is no way that ARRI would record a squashed image out of camera and if you choose to scale only the X then you’ll be distorting your image which is certainly not desirable.

      I hope this helps!

      Regards
      Brad

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  3. andrew aiello says:

    I recently shot my first anamorphic project on my Sony F5. We are having post issues regarding transcoding and final output. Do you have any ideas of the scaling with shooting 4K RAW on the Sony F5 with anamorphic in DaVinci? Thanks

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    • bradleyjandrew says:

      Hi Andrew,

      Thanks for reaching out. Most of my work deals with Alexas and REDs, I’ve used Sony Cameras from time to time but unfortunately can’t shed much light in regards to troubleshooting your transcoding problems.

      If the Sony RAW Processing doesn’t do anything weird with pixel aspect ratio or false resolutions then I’d imagine it’d be a 2x Desqueeze and that’s it.

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  4. Simon says:

    Excellent article! If you were required to have the transcodes at 2.39:1 and/or 2.4:1 instead of the full 2.66:1, what would the input settings be for that?

    Thanks

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    • bradleyjandrew says:

      Thanks Simon. Glad that you found it useful!

      If you have a native aspect ratio of 2.66:1 you need to scale that in by 11.111% to make it 2.40:1.

      I’m on the road at the moment without access to a computer but your combo that 11.111% with the scale that you are already applying to loose the black border. Shouldn’t be too tricky to figure out.

      I always be pretty careful with anything like this as the last thing you want is an incorrect scale and your transcodes representing something other then the DPs Frame.

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      • jesse says:

        hmm i think im having this same issue. this article has been super helpful as a reference so thank you! but if im finishing for 2.39. how would i work with this file?

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      • bradleyjandrew says:

        Hey Jesse,

        Thanks for reaching out. The instructions in this tutorial will run you through getting an output of Full Gate at 2.66:1. If you want to finish 2:39:1 you’d just want to crop in a little bit more so that you lose your left to right racking room.

        I’d import the footage, set it to Cinemascope to desqueeze it and then apply an 11.5% Scale to the image. That should give you 2.39:1 as your output aspect ratio. You’ll need to double check it’s all working on your end though, shooting a frame chart would be beneficial. Another way is to make up a 2.39 Frame Leader, you can make one here: http://www.arri.com/camera/alexa/tools/arri_frameline_composer/ and download it as a PNG File, then overlay that with your transcodes to check all is good.

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  5. Ryan says:

    Just wondering, I’ve done this a few different ways on features, based on post house and editorial requests… couldn’t I just create a custom input sizing or output sizing and apply it to the entire project to save on all those clip attribute steps. Much faster for when you have to add reels n reels of footage all day long?

    If that makes sense would the desqueeze be H: 1.000 W: .694 ?
    Save it as custom scaling input preset
    Then override input scaling and set to the custom preset.
    this would be for a 2x anamorphic project and a 2:39 frame
    left and right ends will be cropped off at some point down the pipe.

    Any input is appreciated

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    • bradleyjandrew says:

      Hey Ryan.

      Thanks for reaching out!

      I see what you mean, so rather than tweaking the pixel aspect ratio to Cinemascope you’d just squish the height of the image to achieve a similar desqueeze effect? The problem I see with that is it needs to be set to Cinemascope to do the desqueeze at 2x, then you need to scale the whole image up as the black border theoretically exists on the left/right/top/bottom, but if that is being sorted further on down the pipeline I think your method would work. I’d just want to be double checking that if it’s 2.8K Anamorphic, that the transcodes that Resolve is spitting out are indeed 2.8K and your not losing any res or weird cropping by using the scaling in that way.

      How do you suggest applying it to the project by default? In the project setting the only options for input/output scaling are:
      -Center crop with no resizing
      -Scale full frame with crop
      -Scale entire image to fit
      -Stretch frame to all corners
      When I was testing, these didn’t work for 2.8K Anamorphic thus I needed the custom scaling which seems to function at a clip level. But if you weren’t worried about the black borders you could just set Output Scaling to ‘Cinemascope’ and ‘Scale entire image to fit’ which should do the trick.

      Hopefully that makes sense!

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