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    • Claudio Freire's avatar
      avcodec/aacpsy: Fix AAC Psy PE reduction calculation when multiple iterations are required · 84f4be42
      Claudio Freire authored
      This is a small change, but it does have a big impact on bit allocation.
      
      all the regressions marked in the report have no audible
      difference (I didn't check them all though), but the improvements can
      be heard.
      
      This affects mostly high bit rates. It's related to issue #2686.
      
      In the report, A is the patched version, B is unpatched, all
      comparisons show deltas in the form (A-B), so a positive pSNR delta
      means a better quality in the patched version, and negative a
      regression. Regressions are only considered for pSNR deltas below
      -1db, they're considered serious below -6db.
      
      All measurements were done with tiny_psnr.
      
      The summary of the report inline for quick reading:
      
      Files: 58
      Bitrates: 6
      Tests: 347
      Serious Regressions: 0 (0%)
      Regressions: 10 (2%)
      Improvements: 54 (15%)
      Big improvements: 26 (7%)
      Worst regression - sine_tester.flac - 384k
        - StdDev: 1.68        pSNR: -3.05     maxdiff: -178.00
      Best improvement - 07 - Bound.flac - 384k
        - StdDev: -1700.05    pSNR: 20.64     maxdiff: -29595.00
      Average          - StdDev: -55.67       pSNR: 1.20      maxdiff: -1593.00
      Signed-off-by: 's avatarMichael Niedermayer <michaelni@gmx.at>
      84f4be42
    • Michael Niedermayer's avatar
      f27d5bd3
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