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  1. My TV (LG 55SJ810) does not support Dolby Atmos and I wonder if there is an easy way to convert an Atmos sound file into something else?

    Thanks in advance for any assistance.
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  2. Try:
    Code:
    ffmpeg -i "input.mkv" -map 0 -c copy -bsf:a truehd_core "output.mkv"
    https://ffmpeg.org/ffmpeg-bitstream-filters.html#truehd_005fcore
    If it still does not play try updating the TV to the latest firmware.

    If the TV does not support TrueHD even with latest firmware but AC3 core is still present open the file in MKVToolNixGUI. It will separate AC3 core and TrueHD/Atmos into separate tracks automatically. Then you can simply not mux the TrueHD/Atmos part.

    If there is no AC3 core but TV does not support TrueHD you can re-encode:
    Code:
    ffmpeg -i "input.mkv" -map 0 -c:v copy -c:a ac3 -b:a 640k -c:s copy "output.mkv"
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  3. Thanks sneaker, much appreciated! I wasn't aware that MKVToolNix automatically separated AC3 and Atmos, but that solves all my problems.

    Atmos is the only thing I'm having trouble with, every other format including TrueHD plays just fine. Firmware is updated automatically as soon as a new version is released, but when asked LG said the TV would likely not be updated to play Atmos.
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  4. Member Cornucopia's Avatar
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    You'd need an app that could decode the Atmos data and render at set positions then re-mix into channel formats, including standard 5.1 SMPTE, etc. AFAIK, nothing like that exists yet. Considering the closed, proprietary nature of Dolby, it would have to be reverse-engineered.

    Scott
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  5. I'm a Super Moderator johns0's Avatar
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    Audacity will re-encode Dolby Atmos 5.1 to dolby ac3 5.1.
    I think,therefore i am a hamster.
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  6. Member Cornucopia's Avatar
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    To be clear: It will strip all the Atmos positioning from the TrueHD container, throwing it away, also probably ignoring the additional 2 channels of any 7.1 material, and just do the conversion with the 5.1-compatible core.

    So, NOT truly Atmos conversion.

    ...sneaker beat me to it.

    Scott
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  7. Thanks all, I appreciate the additional info.

    I should perhaps have been more specific as to my needs - I use stereo exclusively and have no use for the positional data meant for multi-channel. I stream movies via cabled network to my TV and from there to my stereo and all I need is for the audio to be recognised by the TV.
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  8. Audacity will not utilize the Atmos extension, at best use the TrueHD core.
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    Can i use only mkvtoolnix gui to convert dolby atmos or true hd into the core ac3 without loosing any video or sound quality?


    And if i can do that only with the latest(34.0.0) version of mkvtoolnix
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  10. Member Cornucopia's Avatar
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    Regardless of the app used, the ATMOS portion is not accessible nor convertible. The TrueHD portion may be accessible, but there is ALWAYS loss if reverting to the AC3 core.
    Losses on the audio side, IF DONE CORRECTLY, should have no affect on the video side.

    Scott
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    Is there any other program like mkvtoolnix i can convert dolby atmos to ac3 core or dts.
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  12. Member Cornucopia's Avatar
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    NOT the atmos portion. ANYWHERE.

    Scott
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    What?
    I don't understand you.
    Please explain.
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    I want a SIMPLE program like mkvtoolnixor ts muxer to can convert any truehd into a simple ac3 5.1 or 7.1 channels


    Isn't there any that kind of program?


    Can i use xilisoft video converter ultimate to do that?


    Is this programm a good program for convert truehd to simple ac3 5.1 channels?
    Last edited by fits79; 2nd Aug 2019 at 14:26.
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  15. I'm a Super Moderator johns0's Avatar
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    I did say audacity will do what you want,you won't notice any difference in audio quality if you are using a stereo system 2.0.
    I think,therefore i am a hamster.
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    The xilisoft video converter ultimate doesn't do good work?


    The audacity you tell me does it do the work like mkvtoolnix without convert anything simply it removes the extra truehd infos the audio file has in it?
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  17. I'm a Super Moderator johns0's Avatar
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    It will convert to ac3 and it removes all the hd info but you will not notice any sound quality lose since you are using it on a regular stereo system.
    I think,therefore i am a hamster.
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    I download and install audacity but really i don't understand how it work.
    And how i do convertation truehd into ac3 5.1?
    I try it but when i add a sound file it stuck.
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    Isn't there any program more stable like mkvtoolnix or tsmuxer?
    Last edited by fits79; 2nd Aug 2019 at 16:59.
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