What is the correct way to create SDR output from Dolby Vision IMF input

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I'm using aws mediaconvert and want to produce SDR/REC709 output from a dolby vision mezzanine.

I have an input video packaged in an IMF, where the actual video is contained in an mxf with frame interleaved dolbyvision-metadata. From reading the documentation, the way to create an SDR output from an HDR source seems to be to set colorspace conversion to FORCE_709. However, when I do this the result is not good, the colors seems to be off and the output video seems too bright. So is this the correct way to get an SDR output from a dolby vision input, and/or may there be any settings that I am missing?

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Please see this link for the Dolby Vision input requirements when creating a Dolby Vision output. https://docs.aws.amazon.com/mediaconvert/latest/ug/dolby-vision.html Though the input detailed may match these, the output does not seem to be a Dolby Vision. In this case, it appears that color space conversion between DV and SDR may not be supported. HDR and HLG to SDR are supported.

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Mike-ME
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EXPERTE
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Is your question relating to using the Elemental Live encoder? Have you tried other Color Correction settings, Force 601 or Force SDR 2020? Do they provide a better experience? You may want to look a the following link https://docs.aws.amazon.com/elemental-live/latest/ug/about-color-metadata.html

AWS
Mike-ME
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  • No, aws mediaconvert. I've updated the question for clarity. I will try conversion to other color spaces to see what the outcome might be, although i need my output to be rec 709.

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Do you know what format of Dolby Vision is the source? If it is a delivery format, then those are not made to be converted back to SDR. If the source is a mezzanine sourcing format, they it would be good to know what encoding format is being used.

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Mike-ME
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  • Apologies for late reply. The input video is jpeg2000 , 12bit rgb, P3D65 colorspace, with frame interleaved dolby vision metadata, in an MXF container.

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Can you confirm that the source DolbyVision is either Profile 5 or Profile 8.1 What is the out formats that are being created?

AWS
Mike-ME
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No, the source is neither profile 5 nor profile 8.1. As far as I know Dolby Vision Profiles specify formats for end-user deliverables, not for mezzanines.

Regarding the the out-formats, I transcode to h264 in an mp4 container.

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