HEVC HDR MP4/MKV videos on Bolt play back in SDR instead of HDR

Discussion in 'TiVo Bolt DVR/Streamer' started by Mudflapper, Feb 10, 2018.

  1. Mudflapper

    Mudflapper New Member

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    Oct 24, 2014
    Chicago

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    I've been trying to get my Bolt to play 4K HEVC HDR videos transferred from my Mac via pyTivo. You can download and test one of the videos here, if you like: Exodus – 4K UHD HDR Sample Footage)

    I can't get that video to play back in HDR on my Bolt. Nor any other HDR video.

    I can transfer 4K HEVC videos in MKV or MP4 format to the Bolt and they play back perfectly. However, if they're HDR videos they play back in SDR — image is dim and my Vizio M50-D1 displays a "2160p - Normal" indicator instead of "2160p - HDR10." These same exact files, including the sample file from the link above, play in HDR when I use Plex. It appears that the Bolt simply cannot handle HDR.

    Yes, I can just use Plex to play 4K HDR, however, the Vizio display's ethernet connection doesn't seem to be fast enough to handle any video with a bitrate of more than around 50,000. So, I thought I could get around that by utilizing the Tivo instead.

    Has anyone else experienced this? Any solutions?

    Thanks in advance!
     
  2. kpeters59

    kpeters59 Well-Known Member

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    Jun 19, 2007
    Houston, Texas
    So, you're using Plex on the TV? Have you tried Plex on the TiVo?

    -KP
     
  3. Mudflapper

    Mudflapper New Member

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    Oct 24, 2014
    Chicago
    Sorry, I forgot to mention that I tried Plex on Tivo as well. Same thing. It plays but it doesn't play in HDR.
     
  4. jcthorne

    jcthorne Well-Known Member

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    Houston
    pyTivo cannot transfer 4k or HDR recordings to the tivo. It transcodes them down to 1080p.

    You are also correct that Plex for Tivo does not play well with these files either.
     
  5. Mudflapper

    Mudflapper New Member

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    Oct 24, 2014
    Chicago

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    Actually, pytivo transfers 4K recordings just fine. At least in my setup. The Vizio displays a "2160p" indicator only when playing 4K video. I have my Bolt set up for 2160, 1080 and 720 so it's not upscaling, either. So I've got 4K working, I just can't get HDR to work.
     
    Last edited: Feb 11, 2018
  6. fyodor

    fyodor Active Member

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    Sep 19, 2006
    I had been under the same impression-that pytivo couldn't handle 4K. If you look at the detailed info for the file what does it list as the resolution? Does it have the original file size?

    BTW, you may have more success posting this in the Home Media Features forum-some of the pytivo developers and more involved pytivo users are more likely to see it there.
     
  7. jcthorne

    jcthorne Well-Known Member

    3,116
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    Jan 28, 2002
    Houston
    If you really do have this working, the developers would love to hear what exactly got through. Current versions of pyTivo DO NOT support 4k video direct transfers. Its a feature much asked for and left waiting on details of how to make it work.
     
  8. aaronwt

    aaronwt UHD Addict

    23,409
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    Jan 31, 2002
    Northern...
    The Bolt does't support HDR. While TiVo reps have said it's capable of HDR, it has not been implemented on the Bolt yet. Even though the Bolt came out in October 2015.

    When I play back Plex UHD HDR video from my Roku, they will play back in HDR. As well as my Sony UHD BD player. My TiVos choke on just about all of my UHD HDR videos.
     

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