^^^ Interesting. I realize you know much more about this stuff than I
do, but I'm still wondering if there are other possible causes for your
finding.

Are you sure you disabled all processing in squeezelite, picoreplayer,
LMS and such, including easy-to-forget stuff such as Replaygain?
Obviously, it can't be bit-perfect if it's not played back at 0 dBFS, if
it's being resampled or going through some other DSP.

Can you rule out the HDMI-to-SPDIF converter is the culprit?

Maybe it would be a better to test bit-perfection as follows? Re-record
the Pi's HDMI output signal (assuming you have a capable soundcard).
Sample-align the recording to the original. Then use a tool to verify if
the PCM data is equal. I think foo_bitcompare for foobar can do it.


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