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Rip losslessly to flac with abcde
No, that is not true. Giving input which does not meet the specification is an invalid test. These codecs expect audio. If you throw at it non-audio you have an invalid test. If you have a system that will do arithmetic on dollars and cents and you give a test suite including data with 10ths of cents you have an unreasonable test.
Sorry, you're flat-out wrong. FLAC is designed to compress any PCM stream so that it can be decompressed without loss. It is designed to be very efficient for music, but it should never lose information for any PCM stream including white noise, square waves, etc. If somebody was complaining that FLAC didn't achieve a high compression ratio on white noise, then your criticism would be justified. Indeed, it's likely that FLAC "compression" would make a white noise file larger. Even the 180 out of phase test is a mistake if you do not adjust for different latencies. And if the latencies vary over time it should also not matter. The out-of-phase test would be trivial to get right, but why bother? The only thing that matters is the binary difference test. Actually, I guess it might be a useful way to find out if the errors were spread out over the entire file or just in one chunk somewhere. |
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