Latest post Wed, Jan 17 2018 5:32 PM by AsafBlasberg. 9 replies.
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  • Tue, Jan 16 2018 4:41 AM

    Downconvert from UHD to HD

    Hello,

    I have DVX200 / GH5 footage shot in UHD 59.94P, editing in Avid MC. I want to downconvert the footage to HD 1080i 59.94 for output to HD Blu-ray. I tried my Decklink card's UHD to HD HARDWARE downconverter, but everything looks kind of soft. Is there any other methods you recommend to get a nice sharp HD image in 1080i for Blu-ray?

     

    Looking forward to your workflows.

  • Tue, Jan 16 2018 5:58 AM In reply to

    Re: Downconvert from UHD to HD

    Also does it make more sense to go from UHD 59.94P to 720 59.94P for Blu-ray? Even though resolution is less, i don't have to worry about frame conversion. Using Premiere Pro with Maximum Render Quality scaling looks extremely sharp.

  • Tue, Jan 16 2018 10:48 AM In reply to

    • Joachim Claus
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    Re: Downconvert from UHD to HD

    I have good experiences with the following procedure:

    Make a copy of your final UHD-sequence.

    Place it in a new Bin.

    In the Project Window select the "Format" Tab, thdn click on the "Presets:" selection and select HD 1080/59.94.

    Open the Media Creation Settings and select the desired DNxHD format, e.g. DNxHD 240 for transcode and render.

    Render your sequence or make a video mixdown.

    Export your sequence as QT-Reference.

    Encode the QT-Reference file to H.264 in a 3rd-party software or import it directly into a BD-Authoring software, e.g. DVD Architect. Make your BD.

    Remark: If you transcode to H.264 in a 3rd-party software, e.g. Sorenson Squeeze or TMPGEnc Video Mastering Works 6, make sure you select Profile "High", Level "5.2", otherwise you cannot select 59.94fps. Also set Max GOP to less than or equals 60, e.g. 24 or 30 or 60.

    Good Look,

    Joachim

    SuperMicro Workstation 7048A-T Dual Xeon (10 cores) E5-2640v4 2.4GHz 128 GB RAM, PNY P4000, 1 PCIe SSD 400 GB (Intel SSDPEDMW400G4) 1 SSD 2 TB for UHD... [view my complete system specs]

    Joachim Claus

  • Tue, Jan 16 2018 12:24 PM In reply to

    • Lukas Boeck
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    Re: Downconvert from UHD to HD

    what claus said.

     

    change resolution of your project at any time & refresh seqence.

    if weary, make  a mixdown first.

    there's a but: Bluray only does interlaced at 25 or 29,97 fps, as you said yourself.

    so you'll never get the feeling of a really sharp picture.

     

    MC 2018.12.2 Cusom bulid Supermicro X9SRL-F, 32 Gig Ram, 3ware 9750 6x6TB Seagate EC Drives, LSI 9207 + LTO-6, Mojo DX, Artist Color, Flanders CM240, GTX... [view my complete system specs]
  • Tue, Jan 16 2018 3:34 PM In reply to

    Re: Downconvert from UHD to HD

    I took my UHD 59.94P footage and converted to HD 1080i using Avid and what you folks told me to do method-wise. I have to say it looks very sharp and excellent. I do see a few aliasing here and there, but it's very minimal.

    Looks like Blackmagic UHD downconvert has an anti-alias filter which makes everything looks softer.

    Conclusions? Which would you use guys?

  • Tue, Jan 16 2018 6:26 PM In reply to

    Re: Downconvert from UHD to HD

    Also, upon further testing, it looks like with Blackmagic's UHD to HD hardware downconvert, there is an anti-aliasing filter applied, making the image a bit softer, but i don't see any aliasing. With Avid I definitely see aliasing. So which one would be better - i guess it depends on the client's decision. In any event, I'm curious what Hollywood Studios use - what their methods are - do they use Avid's DNX hardware? If so that would be the same downconverter as my Decklink 4K :)

  • Wed, Jan 17 2018 9:11 AM In reply to

    • Joachim Claus
    • Top 150 Contributor
    • Joined on Fri, Nov 4 2005
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    Re: Downconvert from UHD to HD

    AsafBlasberg:
    I took my UHD 59.94P footage and converted to HD 1080i using Avid

    Why did you convert to 1080i? You can produce BD's with 1080/p59.94. I do this with 1080/50p, and the result is excellent with no aliasing.

    Even when 50p/59.94p is not part of the BD-standard, it works fine. You just have to set the Profile and Level accordingly.

    Joachim 

    SuperMicro Workstation 7048A-T Dual Xeon (10 cores) E5-2640v4 2.4GHz 128 GB RAM, PNY P4000, 1 PCIe SSD 400 GB (Intel SSDPEDMW400G4) 1 SSD 2 TB for UHD... [view my complete system specs]

    Joachim Claus

  • Wed, Jan 17 2018 1:09 PM In reply to

    Re: Downconvert from UHD to HD

    Hi Joachim,

    59.94p is not part of the BD-Standard, so how are you able to author and burn it? I use Scenarist BD authoring software and it will not let me import any 59.94p 1080p H.264 files as it is not compatible with the spec. Can you tell me what your workflow is to burn 59.94p 1080p Blu-ray.

    Thanks,

    Asaf

  • Wed, Jan 17 2018 4:54 PM In reply to

    • Joachim Claus
    • Top 150 Contributor
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    Re: Downconvert from UHD to HD

    Asaf,

    I use authoring software from DVD-Logic (BD-Author), which allows to use 50fps and 59.94 fps. But as you say, the use of 50fps (progressive) and 59.94fps (progressiv) is outside the BD-specification. My player and players of a number of my friends play BD's with 1080/50p without problems.

    If you want to stay in the BD-standard, I recommend to make your BD format 29.97 fps progressive or convert to 24 fps.

    BTW:

    I tested DVD Architect, and it also inhibits BD production in 1080/50p, it only allows 1080/25 (PAL country).

    Joachim 

    SuperMicro Workstation 7048A-T Dual Xeon (10 cores) E5-2640v4 2.4GHz 128 GB RAM, PNY P4000, 1 PCIe SSD 400 GB (Intel SSDPEDMW400G4) 1 SSD 2 TB for UHD... [view my complete system specs]

    Joachim Claus

  • Wed, Jan 17 2018 5:32 PM In reply to

    Re: Downconvert from UHD to HD

    Hi Joachim,

    Thank you for much for this. I use Scenarist BD and it also prohibits BD authoring in 1080/59.94p (I'm from USA-NewYork). I tried BD-Author and yes you are right that it works perfectly.

     

    I will use the non-BD-standard at 1080-59.94P (progressive) since my discs are for duplication. I'm sure for replication i'll have to make the BD-standard of 720-59.94p instead. Both look great. :)

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