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Please support audio upmix #2143
Please add support for upmixing audio to a higher number of channels, e.g. mono to stereo or stereo to 5.1.
My use case is archiving the extra features from a BluRay. I like to put all the extra features into a single MKV file. First I HandBrake all the individual extra features, then I put them together with MkvTooNix. For this to work all the pieces need to have identical audio and video encodings. Today I need to downmix to the lowest common channel setting. I would much prefer to keep the highest channel count.
This same use case i also applicable to video upscaling, but there are already other feature requests for that.