I have quite a few SACDs by MDG (Dabringhaus & Grimm) and divox that are recorded in 2+2+2 format. See these two audaud articles for details:
https://www.audaud.com/first-special-feature-on-222-multichannel-discs/
https://www.audaud.com/aurophonie-and-222/
2+2+2 are distributed on SACD and the channels are mapped as follows:
L => L
R => R
C => L front height
LFE => R front height
L surround => L surround
R surround => R surround
Obviously it is not ideal to have the L and R front height channels coming out of the center and subwoofer speakers (although the mix is done in such a way that the 'straight' reproduction is not catastrophic). So far I have played these recordings by converting the mch dsf files to pcm and keeping only the L, R, L surround and R surround channels. I simply left out the center and subwoofer information using ffmpeg's pan filter.
After my first steps with channel mapping using ffmpeg I would like to create a pcm file in 11.1.4 atmos mapping that populates the six channels with the correct placements using the pan functions. This will allow my Onkyo PR SC5507 (which can to front heights) to correctly map the height channels into the 4.0 speaker setup that I have. Also I would like to take the 11.1.4 file to a friend's atmos setup to get an idea what 2+2+2 is actually meant to sound like.
The missing link in this project is the 11.1.4 channel designations that ffmpeg uses. I have found documentation on the c0 c1 c2 c3 c4 c5 nomenclature for 5.1 setups, but nothing on 11.1.4.
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I don't think ffmpeg has an 11.x mapping.
Code:NAME DESCRIPTION FL front left FR front right FC front center LFE low frequency BL back left BR back right FLC front left-of-center FRC front right-of-center BC back center SL side left SR side right TC top center TFL top front left TFC top front center TFR top front right TBL top back left TBC top back center TBR top back right DL downmix left DR downmix right WL wide left WR wide right SDL surround direct left SDR surround direct right LFE2 low frequency 2 TSL top side left TSR top side right BFC bottom front center BFL bottom front left BFR bottom front right Standard channel layouts: NAME DECOMPOSITION mono FC stereo FL+FR 2.1 FL+FR+LFE 3.0 FL+FR+FC 3.0(back) FL+FR+BC 4.0 FL+FR+FC+BC quad FL+FR+BL+BR quad(side) FL+FR+SL+SR 3.1 FL+FR+FC+LFE 5.0 FL+FR+FC+BL+BR 5.0(side) FL+FR+FC+SL+SR 4.1 FL+FR+FC+LFE+BC 5.1 FL+FR+FC+LFE+BL+BR 5.1(side) FL+FR+FC+LFE+SL+SR 6.0 FL+FR+FC+BC+SL+SR 6.0(front) FL+FR+FLC+FRC+SL+SR 3.1.2 FL+FR+FC+LFE+TFL+TFR hexagonal FL+FR+FC+BL+BR+BC 6.1 FL+FR+FC+LFE+BC+SL+SR 6.1(back) FL+FR+FC+LFE+BL+BR+BC 6.1(front) FL+FR+LFE+FLC+FRC+SL+SR 7.0 FL+FR+FC+BL+BR+SL+SR 7.0(front) FL+FR+FC+FLC+FRC+SL+SR 7.1 FL+FR+FC+LFE+BL+BR+SL+SR 7.1(wide) FL+FR+FC+LFE+BL+BR+FLC+FRC 7.1(wide-side) FL+FR+FC+LFE+FLC+FRC+SL+SR 5.1.2 FL+FR+FC+LFE+BL+BR+TFL+TFR octagonal FL+FR+FC+BL+BR+BC+SL+SR cube FL+FR+BL+BR+TFL+TFR+TBL+TBR 5.1.4 FL+FR+FC+LFE+BL+BR+TFL+TFR+TBL+TBR 7.1.2 FL+FR+FC+LFE+BL+BR+SL+SR+TFL+TFR 7.1.4 FL+FR+FC+LFE+BL+BR+SL+SR+TFL+TFR+TBL+TBR 7.2.3 FL+FR+FC+LFE+BL+BR+SL+SR+TFL+TFR+TBC+LFE2 9.1.4 FL+FR+FC+LFE+BL+BR+FLC+FRC+SL+SR+TFL+TFR+TBL+TBR hexadecagonal FL+FR+FC+BL+BR+BC+SL+SR+TFL+TFC+TFR+TBL+TBC+TBR+WL+WR downmix DL+DR 22.2 FL+FR+FC+LFE+BL+BR+FLC+FRC+BC+SL+SR+TC+TFL+TFC+TFR+TBL+TBC+TBR+LFE2+TSL+TSR+BFC+BFL+BFR
I suspect it's using 'hexadecagonal' for 11.1.4
Cu Selurusers currently on my ignore list: deadrats, Stears555 -
Thanks, Selur
It looks like MDG's 2+2+2 is simply 5.1.2 (in ffmpeg terms) with FC and LFE empty.
5.1.2 FL+FR+FC+LFE+BL+BR+TFL+TFR
Would the channel names map to channel numbers as follows?
FL FR FC LFE BL BR TFL TFR
c0 c1 c2 c3 c4 c5 c6 c7
?Last edited by rudolffischer; 14th Mar 2024 at 08:08.
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Yes, looks correct to me.
users currently on my ignore list: deadrats, Stears555 -
I am not encoding to Dolby Atmos. I am working with multichannel FLAC files.
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