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I've been trying to downmix a 5.1 DTS HD-MA (specifically arranged as C L R Ls Rs LFE) track into 2.1 (with LFE), but I'm not sure of the recommended/standard way that doesn't mess up the audio. I first extracted the audio alone into an mka container, and then ran:

ffmpeg -i "audio.mka" -c dca -vol 256-af "pan=stereo|FL=0.5*FC+0.707*FL+0.707*BL+0.5*LFE|FR=0.5*FC+0.707*FR+0.707*BR+0.5*LFE" "audio-stereo.mka"

But I get an error: -vol has been deprecated. Use the volume audio filter instead

I'm not exactly sure how to fix this. I also want to downmix to 2.1 other immersive tracks (Atmos/DTS-X and maybe some regular 7.1 as well), is that possible using ffmpeg or it is not supported? I'm just not familiar with these commands in general.

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  • Best way to not mess up the audio is to just play it back on a device that's only 2.1-capable. It will do it on the fly.
    – Tetsujin
    Commented Jun 17, 2021 at 7:35
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    @Tetsujin Not all devices do though, which is precisely the point of what I'm trying to accomplish. If it worked, I wouldn't have asked.
    – Noitaercar
    Commented Jun 17, 2021 at 14:29
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    These are two questions. (1) The "best" way probably depends on how the audio is laid out for the particular file - different coefficients will give different (and better/worse, depending on your taste) downmixing results. So experiment. I am also not sure you want LFE in the FL/FR mix if you have 2.1. (2) Quick googling finds docs on how to use the volume audio filter instead of -vol. (3) Is there a space missing between 256 and -af?
    – dirkt
    Commented Jun 17, 2021 at 16:42

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