Back then (4 years ago) I made a script to create compressed version of
ambisonics files from source .amb files. It was rendering m4a and opus
files with any numbers of channels (like 3 channels for horizontal-only
FOA). It was using the channelx and interlx utils from the MCTools suite
to extract and reassemble channels in intermediate files. Final m4a
files were compressed using the fdkaac tool from Fraunhofer. So only
libre/open tools were used, on Linux (the same should be possible on OSX
and Windows).
Marc
Le 2019-01-11 à 8:53 a.m., Paul Hodges a écrit :
--On 10 January 2019 22:44 +0100 David Pickett <d...@fugato.com> wrote:
I agree. But it seems that the only way I have of making aac mp4
files is to make them 5.1.
I use Wavelab, but that's expensive. Richard Dobson's MCTools suite pf
programs would enable one to remove the unneeded channels and set an
appropriate channel mask.
Which browsers have you tested, Paul? How does one set up a browser
to recognise 4.0?
In Windows: IE, Edge, Firefox, Chrome, Opera. The point is that they
all use the Windows default audio output, which can be set up to be
multichannel with a range of layouts - and Windows will do the most
appropriate mixing to match the channels between the input and the
available speakers. Once set up it all just works.
Paul
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