View Revisions: Bug #1281

Summary 0001281: No full audio downmix for multichannel audio
Revision 2018-04-22 01:04 by Carsten
Description

Ooops - I was just checking multichannel DCP and audio file playback in DCP-o-matic 2.12.x and 2.13.x - the default playback device on my Mac is stereo.

Only input tracks assigned to DCP channels 1-3 (L/R/C) are audible during playback. When I assign input 4,5,6 (LFE, Ls, Rs) to either channel 1,2 or 3, they become audible. They are silent when assigned to DCP channels 4,5,6 (LFE, Ls, Rs).

Same happens for both DCPs, audio MXFs, and e.g. quicktime files.

Strange thing - when I try 2.11.17, only channels mapped to 1/2(L/R) become audible. In 2.12.x/2.13.x, channels become audible when mapped to either 1,2 or 3... Looks as if the downmix function is 'truncated' after channel 3/center.

I guess that is not intentional? ;-)

I may have been so fascinated about the option to play back to actual multichannel interfaces, that I didn't bother testing the downmix option - at least as long as the important center/dialog channel was always there... Probably the reason no one else complained so far. Have to test in windows.

  • Carsten
Revision 2018-04-22 01:02 by Carsten
Description

Ooops - I was just checking multichannel DCP and audio file playback in DCP-o-matic 2.12.x and 2.13.x - the default playback device on my Mac is stereo.

Only input tracks assigned to DCP channels 1-3 (L/R/C) are audible during playback. When I assign input 4,5,6 (LFE, Ls, Rs) to either channel 1,2 or 3, they become audible.

Same happens for both DCPs, audio MXFs, and e.g. quicktime files.

Strange thing - when I try 2.11.17, only channels mapped to 1/2(L/R) become audible. In 2.12.x/2.13.x, channels become audible when mapped to either 1,2 or 3... Looks as if the downmix function is 'truncated' after channel 3.

I guess that is not intentional? ;-)

I may have been so fascinated about the option to play back to actual multichannel interfaces, that I didn't bother testing the downmix option - at least as long as the important center/dialog channel was always there... Probably the reason no one else complained so far. Have to test in windows.

  • Carsten