[pulseaudio-discuss] pulseaudio-discuss Digest, Vol 125, Issue 9

[Vijendar Reddy Mukunda]

On Thu, Sep 16, 2021 at 5:30 PM
<pulseaudio-discuss-request at lists.freedesktop.org> wrote:
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> Today's Topics:
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>    1. how to pass correct channel map (Vijendar Reddy Mukunda)
>    2. Re: how to pass correct channel map (Sean Greenslade)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Wed, 15 Sep 2021 21:59:00 +0530
> From: Vijendar Reddy Mukunda <vijendar.reddy at gmail.com>
> To: pulseaudio-discuss at lists.freedesktop.org
> Subject: [pulseaudio-discuss] how to pass correct channel map
> Message-ID:
>         <CABxRAMqJqMPKW3Xnu8+9ex92VW8+20DPwvXHkt8vh-vHXqqR2w at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
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> Hello,
>
> I was just experimenting with a null sink.
> I have created null sink with 48000Hz sample rate, s16le, channels as 6.
> Tried to record from null sink monitor source.
> But when i run parecord command, I am seeing the below error.
> Warning: failed to write channel map to file.
> I have also tried null sink creation
> with channel_map=front-left,front-right,rear-left,rear-right,front-center,lfe.
> But no luck.
> Need inputs on fixing this channel map issue.
>
> Thanks,
> Vijendar
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> ------------------------------
>
> Message: 2
> Date: Wed, 15 Sep 2021 22:36:23 -0700
> From: Sean Greenslade <sean at seangreenslade.com>
> To: General PulseAudio Discussion
>         <pulseaudio-discuss at lists.freedesktop.org>
> Subject: Re: [pulseaudio-discuss] how to pass correct channel map
> Message-ID: <YULX1//S1wM8QFl2 at bailey>
> Content-Type: text/plain; charset=us-ascii
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> On Wed, Sep 15, 2021 at 09:59:00PM +0530, Vijendar Reddy Mukunda wrote:
> > Hello,
> >
> > I was just experimenting with a null sink.
> > I have created null sink with 48000Hz sample rate, s16le, channels as 6.
> > Tried to record from null sink monitor source.
> > But when i run parecord command, I am seeing the below error.
> > Warning: failed to write channel map to file.
> > I have also tried null sink creation
> > with channel_map=front-left,front-right,rear-left,rear-right,front-center,lfe.
> > But no luck.
> > Need inputs on fixing this channel map issue.
>
> That error is just a warning, and can most likely be ignored. Not all
> sound formats actually support writing the channel map into them. In
> fact, according to the libsndfile docs, only AIFF and CAF are supported:
>
> https://libsndfile.github.io/libsndfile/command.html#sfc_set_channel_map_info
>
> What file format are you using?
>
> --Sean

Thank you for your explanation.
We are trying to play youtube content.
One more question on the same line.
we have created a null sink with 192khz/8ch/s32le and channel map as
"front-left,front-right,rear-left,rear-right,front-center,lfe,side-left,side-right"
When we record null sink monitor output, we are seeing complete silence
in one channel.
As we are using lfe as one channel, do we need to do any extra settings
on lfe channel?

-Vijendar


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> End of pulseaudio-discuss Digest, Vol 125, Issue 9
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