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[fix] use correct rendering format for EVS conditions for MUSHRA loudspeaker tests

Archit Tamarapurequested to merge
update-bs1534-mc-configs into main

BS.1534 tests with loudspeaker output inadvertently have an intermediate conversion to Stereo after the EVS conditions.

This MR ensures the correct processing flow. Only experiments with loudspeaker output are affected (BS.1534-5, 6 and 9).

Previous incorrect processing steps:

  • Format conversion from input MC format to Mono
  • EVS Coding
  • Upmix of Mono EVS output to Stereo
  • Rendering of Stereo to output MC format

New corrected processing steps:

  • Format conversion from input MC format to Mono
  • EVS Coding
  • Rendering of Mono to output MC format

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