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  1. Hi, I want to convert a Flac audio track from a video to TrueHD. When I do this with Xmedia recode, it encodes it in "standard" DTS. Is there another way?
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  2. Are you sure Xmedia recoder can convert to TrueHD?
    I thought the only tools capable of encoding TrueHD were those of Dolby itself.
    So my guess is that you will have to invest quite a bit of money to get a TrueHD encoder,...
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  3. ffmpeg has an (experimental) TrueHD encoder. (Getting AC3+TrueHD is a different problem, though.)
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  4. Well I managed to make this conversion with Xmedia Recode, it was just in the format selection. So now I'm asking if is this real TrueHD?
    Last edited by TBsq; 29th Apr 2020 at 14:02.
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    Well I managed to make this conversion with Xmedia Recode, it was just in the format selection. So now I'm asking if is this real TrueHD?
    Use MediaInfo, or read what a professional BD authoring software says about it.

    Also, keep in mind that ffmpeg's MLP/TrueHD encoder compresses so poorly that the result has almost the same size as uncompressed PCM.
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  6. @ElHeggunte: Is it really ffmpegs TrueHD encoder or is it TrueHD in general?
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  7. I cannot confirm this either way after a few tests. For one random Hollywood movie with 5.1 ffmpeg TrueHD encoder achieved 68% bitrate saving (without AC3 core). It's content-dependent, though, with the lowest saving being closer to 25%.
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    Originally Posted by Selur View Post
    @ElHeggunte: Is it really ffmpegs TrueHD encoder or is it TrueHD in general?
    I have just compared an ancient version of ffmpeg (4.1.4) with a fresh one (git-2020-04-26-1128aa8). In general this latter compresses somewhat-better than the old one, but it still doesn't have the same efficiency of the official encoders from Meridian/Dolby.
    Last edited by El Heggunte; 30th Apr 2020 at 03:11. Reason: grammar :-/
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  9. Thanks, good to know. btw. is there a freeware tool which can combine an ac3 and truehd stream into a ac3&truehd combi stream?
    ffmpeg, tsMuxeR, eac3to (and probably mkvtoolnix) can be used to split the combi stream, but how to recombine it?

    Cu Selur
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  10. Haven't seen any, but eac3to can encode a (new) AC3 core to an existing core-less TrueHD file.
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