To assemble FOA files in amb files, I use channelx and interlx from the CDP suite: http://www.unstablesound.net/cdp.html
channelx is to extract channels to mono files, while interlx is to interleave mono files in a proper amb file (with the appropriate WAVE_EX Ambisonic header) that can be correctly compressed to flac or other formats. For infos on the amb format and the ordering of channels: http://members.tripod.com/martin_leese/Ambisonic/B-Format_file_format.html I use command line tools on Linux, but the same can be done on OSX and Windows (with CygWin). -- Marc On Sat, 26 Mar 2016 01:37:46 +0000, Stefan Schreiber <st...@mail.telepac.pt> a écrit : > 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 > > > > > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe > here, edit account or options, view archives and so on. _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
