Bo-Erik Sandholm wrote:
Has anyone a procedure or description on how to create 4 channel
Flac flac files?
I want to use VLC as a player on windows to start a vst chain for FOA to
binaural processing.
Best Regards
Bo-Erik
https://xiph.org/flac/format.html
(and https://xiph.org/flac/format.html#stream)
Now look to
FRAME_HEADER,
then (4 bits) < Channel assignment >
You could use < 0011 > to describe a 4 channel format, but Ambisonics
(FOA) != (ITU-R) L, R, LS and RS.
You could use one of the reserved codes - but technically this would be
a hack of the format.
I believe it would make sense to contact Xiph.org and to suggest to
define a 4-channel "FOA opcode"/format. (The channel assignment would be
WXYZ, of course.)
This is all very simple, but any format extension should be done by the
format careholders. They could use "opcode" 1011 or 1110 (second last),
IMO. (I personally prefer1011.)
OR
You could just define a FOA-FLAC format about in this way, suggesting
the "brainstorming experiment" as global solution later.... :-D
Note that the < number of channels > is not defined by < channel
assignment >.
It's here:
< METADATA_BLOCK_STREAMINFO >
<3> (number of channels)-1. FLAC supports from 1 to 8 channels
Ambisonics currently doesn't fit into FLAC 's official channel
assignment scheme. (6.1 and 7.1 are in.)
I don't see how Aaron's suggestions could fix this annoying fact. Some
(minimum) extension is necessary.
So it comes down to the old question: Shall we, or shall we not?
Best regards,
Stefan
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