[FFmpeg-trac] #10180(avfilter:new): pan audiofilter regression

[FFmpeg]

#10180: pan audiofilter regression
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             Reporter:  Jose Peirote  |                     Type:  defect
               Status:  new           |                 Priority:  normal
            Component:  avfilter      |                  Version:  5.1.2
             Keywords:                |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
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 Summary of the bug:
 The ticket #10168 is not fixed.

 ffmpeg -i "8w341.wav" -af "pan=FL+FR+FC+LFE|c0=c0|c1=c1|c2=c2|c3=c3"
 -acodec pcm_s16le "8w341_51.wav"
 ffmpeg version N-109781-g25f31929b6-20230209 Copyright (c) 2000-2023 the
 FFmpeg developers
   libavutil      57. 44.100 / 57. 44.100
   libavcodec     59. 63.100 / 59. 63.100
 ...
 Input #0, wav, from '8w341.wav':
   Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, 7.1,
 s16, 6144 kb/s
 [Parsed_pan_0 @ 000001100b6c98c0] Pure channel mapping detected: 0 1 2 3
 Output #0, wav, to '8w341_51.wav':
   Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, 3.1,
 s16, 3072 kb/s

 The output have a correct channelmask FL+FR+FC+LFE but now with a
 different channel remix than before (#10168). See the new image.

 Instead c0=c0|c1=c1|c2=c2|c3=c3, do a renormalize?:
 FL'= FL
 FR'= 0.59*FL + 0.41*FR
 FC'= 0.41*FC
 LFE'=0.41*LFE
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10180>
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