https://github.com/Randrianasulu/mctoolame-experiments-enc (encoder) and https://github.com/Randrianasulu/mctoolame-experiments (decoder) I think they roundtrip finally! You need to check non-default branch 'master' (it just happen to be default on my Slackware's git install!) then try to make in each folder initial source aiff was made with SoX (-M mode) bash-5.1$ ./mctoolame 5ch.aiff ISO MPEG Audio Subgroup Software Simulation Group (1996) ISO 13818-3 MPEG-2 Audio Multichannel Encoder $Revision: 2.0 $ Num. ch: 5 Samples per frame 511584 Sample size in bits 16 Sample rate 48000.000000 Sound data is not PCM in "5ch.aiff".
Using 3/2 configuration. Encoding configuration: Layer=II mode=stereo extn=0 psy model=1 samp frq=48.0 kHz mpeg1 bitrate=192 kbps No multilingual coding. de-emph=0 c/right=0 orig=0 errprot=0 matrix=0 center=1 surround=2 stereo=2 stereomc=3 stereoaug=0 input file: '5ch.aiff' output file: '5ch.aiff.mp2' bash-5.1$ mc
bash-5.1$ rm *.wav bash-5.1$ ../lamedecoder/mctoolamed 5ch.aiff DECODED ISO MPEG Audio Subgroup Software Simulation Group (1996) ISO 13818-3 MPEG-2 Audio Multichannel Decoder $Revision: 2.2 $ Could not find "5ch.aiff.ext". No extension bitstream <5ch.aiff.ext> present Input file = '5ch.aiff.mp2' Output file = 'DECODED.aiff' >>> A MPEG 2 Layer-1/2 bitstream will be decoded Output file written in AIFF format the bit stream file 5ch.aiff.mp2 is a BINARY file HDR: s=FFF, id=1, l=2, ep=1, br=A, sf=1, pd=0, pr=0, m=0, js=0, c=0, o=0, e=0 layer=II, MPEG1-bitrate=192, sfrq=48.0, mode=stereo, sblim=27, jsbd=27, MPEG1-ch=2 mc-channel=3, MPEG2-ext-length=0 kbit/s initialising 5 output files next mpg header not found Frame cannot be located, end of input stream Decoding of "5ch.aiff.mp2" with 445 frames is finished The decoded PCM output file name is "DECODED.aiff" "DECODED.aiff" has been written with AIFF header information bash-5.1$ cin *.wav Cinelerra Infinity - built: Dec 22 2023 12:26:23 git://git.cinelerra-gg.org/goodguy/cinelerra.git (c) 2006-2019 Heroine Virtual Ltd. by Adam Williams 2007-2020 mods for Cinelerra-GG by W.P.Morrow aka goodguy 2003-2017 mods for Cinelerra-CV by CinelerraCV team 2015-2023 mods for Cinelerra-GG by Cinelerra-GG team Libav version: Lavc60.31.102 Cinelerra is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. There is absolutely no warranty for Cinelerra. RenderFarmClient::main_loop: client started Total excess of backups: -50 Session time: 0:01:58 Cpu time: user: 0:00:27.111 sys: 0:00:06.654 bash-5.1$ cin DECODED.aiff Cinelerra Infinity - built: Dec 22 2023 12:26:23 git://git.cinelerra-gg.org/goodguy/cinelerra.git (c) 2006-2019 Heroine Virtual Ltd. by Adam Williams 2007-2020 mods for Cinelerra-GG by W.P.Morrow aka goodguy 2003-2017 mods for Cinelerra-CV by CinelerraCV team 2015-2023 mods for Cinelerra-GG by Cinelerra-GG team Libav version: Lavc60.31.102 Cinelerra is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. There is absolutely no warranty for Cinelerra. RenderFarmClient::main_loop: client started Total excess of backups: -50 Session time: 0:00:52 Cpu time: user: 0:00:06.783 sys: 0:00:01.854 bash-5.1$ rm DECODED.aiff bash-5.1$ rm *.wav bash-5.1$ I think for viewing decoded files one AIFF file is better ? Note, I only tested them on x86-32 Slackware!, currently broken on Big Endian (native for AIFF sound format) hardware