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Only for primary channel sets if they embeed coefficients for now. $ ./ffmpeg -downmix stereo -i $fate-suite/dts/dcadec-suite/xll_51_24_48_768.dtshd -y native.wav Before: $ ./ffmpeg -i $fate-suite/dts/dcadec-suite/xll_51_24_48_768.dtshd -af aresample,aformat=channel_layouts=stereo -y swr.wav [...] [Parsed_aresample_0] [SWR] Using fltp internally between filters [Parsed_aresample_0] [SWR] Matrix coefficients: [Parsed_aresample_0] [SWR] FL: FL:0.414214 FR:0.000000 FC:0.292893 LFE:0.000000 SL:0.292893 SR:0.000000 [Parsed_aresample_0] [SWR] FR: FL:0.000000 FR:0.414214 FC:0.292893 LFE:0.000000 SL:0.000000 SR:0.292893 [Parsed_aresample_0] ch:6 chl:5.1(side) fmt:s32p r:48000Hz -> ch:2 chl:stereo fmt:s16 r:48000Hz [...] $ tests/tiny_psnr.exe native.wav swr.wav stddev:21178.05 PSNR: 9.81 MAXDIFF:49613 bytes: 8192/ 8192 After: $ ./ffmpeg -i $fate-suite/dts/dcadec-suite/xll_51_24_48_768.dtshd -af aresample,aformat=channel_layouts=stereo -y swr.wav [...] [Parsed_aresample_0] [SWR] Using fltp internally between filters [Parsed_aresample_0] [SWR] Custom matrix coefficients: [Parsed_aresample_0] [SWR] FL: FL:-0.100006 FR:0.000000 FC:0.000000 LFE:0.000000 SL:-0.707092 SR:0.000000 [Parsed_aresample_0] [SWR] FR: FL:0.000000 FR:-0.100006 FC:0.000000 LFE:0.000000 SL:0.000000 SR:-0.707092 [Parsed_aresample_0] ch:6 chl:5.1(side) fmt:s32p r:48000Hz -> ch:2 chl:stereo fmt:s16 r:48000Hz [...] $ tests/tiny_psnr.exe native.wav swr.wav stddev: 0.71 PSNR: 99.22 MAXDIFF: 1 bytes: 8192/ 8192 Signed-off-by: James Almer <jamrial@gmail.com>