[Cin] trying to fix libopus for 5.1 sound

[Andrea paz]

> But then can you try ffmpeg 7 with and without patch just in case it only affects ffmpeg 7.0?

Still the same result.
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General
Complete name                            : opus_test_ffmpeg7_no_patch.webm
Format                                   : WebM
Format version                           : Version 4
File size                                : 5.51 MiB
Duration                                 : 2 min 31 s
Overall bit rate                         : 306 kb/s
Writing application                      : Lavf61.1.100
Writing library                          : Lavf61.1.100

Audio
ID                                       : 1
Format                                   : Opus
Codec ID                                 : A_OPUS
Duration                                 : 2 min 31 s
Channel(s)                               : 6 channels
Channel layout                           : L R C Lb Rb LFE
Sampling rate                            : 48.0 kHz
Bit depth                                : 32 bits
Compression mode                         : Lossy
Language                                 : Italian
Default                                  : No
Forced                                   : No