On 26.09.2016 13:10, Robert Krüger wrote:
Hi,
On Mon, Sep 26, 2016 at 12:42 PM, Carl Eugen Hoyos <[email protected]>
wrote:
2016-09-26 12:17 GMT+02:00 Robert Krüger <[email protected]>:
I would like to know if it is possible to create a wave file that
contains
n channels of audio which do not have a channel layout like 5.1 or
stereo,
(I assumed n==1 here because it should work fine for n>2)
much like a file used in broadcast for just storing n signals in one wav
file.
It works fine for >16bit or >48kHz.
I just sent a patch that fixes it for all (pcm) audio, that will not fix
the
front center (mono) case though: If this is an issue (if your software
does not default to front center for 1-channel pcm wav), please
tell me;-)
Thanks for the quick reply! I meant something like writing a 4,6 or
8-channel wav that just really contains 4,6,8 mono channels. E.g. some
cameras or other multi-track recording devices generate signals like these
and I would like to be able to put them in one wav file for archiving or
later processing.
If the input file doesn't have a channel mask you should be able to use
the "-guess_layout_max 0" input option.
Reading a bit through a few specs I am not sure whether
this requires using RF64 features (specifically the new constant
SPEAKER_ALL 0x80000000 for the channel assignment) and, to be honest, if
that makes sense at all.
In my opinion an undefined channel mask makes sense in your case. I'm in
a very similar situation when recording AVI files with PCM audio and
there I use the "-write_channel_mask off" output option.
You don't need RF64 features, see section "Details about dwChannelMask"
in https://msdn.microsoft.com/en-us/library/windows/hardware/dn653308.aspx :
"If, for example in a multi-channel audio authoring application, no
speaker location is desired on any of the mono streams, the
dwChannelMask should explicitly be set to 0."
Best regards,
Tobias
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