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Old 27th January 2019, 18:33   #4  |  Link
Sparktank
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Join Date: Mar 2011
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Since the audio peaks at 24bit, eac3to will store it in a 24bit container.

Unless, you tell it to dither down to 16bit then it will store in a 16bit container.

It's trying to keep the original bit depth for the TrueHD stream as much as possible, so a 24bit container is the solution.
The actual bit depth for the TrueHD is greater than 16 bit depth, and there's no container for 17-23, so 24 is what it must use.

Convert to FLAC and it will be smaller.
Use eac3to to dither down to 16bits and save in FLAC, and it will be even smaller.
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