GStreamer on ROS using common_audio package

[piti_wity]

I am working on a ROS project where I need to stream audio from a raspberry
PI 3 to my computer.

At the moment I am working only on the raspberry and I have worked out a
correct gstreamer pipeline to be used, which is the following:

gst-launch-0.10 alsasrc device=hw:1,0 ! audioconvert ! audioresample !
alsasink

Anyway, when I use the ROS package audio_common (
<href=&quot;http://wiki.ros.org/audio_common&quot;> ), in particular the
audio_capture feature (  ) the error "[ERROR] [1506519371.050052798]: Failed
to create encoder element" pops out.

I tried a lots of difference set-ups and several plugins, but since gstream
is correctly working when I launch it from the command line, I am quite sure
that it is due to some configuration issues.

Thanks a lot in advance.
<https://github.com/ros-drivers/audio_common/blob/master/audio_capture/src/audio_capture.cpp>



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[Nicolas Dufresne-5]

Le 27 sept. 2017 4:02 PM, "piti_wity" <[hidden email]> a écrit :

I am working on a ROS project where I need to stream audio from a raspberry
PI 3 to my computer.

At the moment I am working only on the raspberry and I have worked out a
correct gstreamer pipeline to be used, which is the following:

gst-launch-0.10 alsasrc device=hw:1,0 ! audioconvert ! audioresample !
alsasink

Anyway, when I use the ROS package audio_common (
<href=&quot;http://wiki.ros.org/audio_common&quot;> ), in particular the
audio_capture feature (  ) the error "[ERROR] [1506519371.050052798]: Failed
to create encoder element" pops out.

Did you select mp3 format, and if so, do you have lamemp3enc element installed?

I tried a lots of difference set-ups and several plugins, but since gstream
is correctly working when I launch it from the command line, I am quite sure
that it is due to some configuration issues.

Thanks a lot in advance.
<https://github.com/ros-drivers/audio_common/blob/master/audio_capture/src/audio_capture.cpp>



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[piti_wity]

Thanks for your reply Nicolas.

I did select mp3 as format, and I think that you are right, the problem is
that I don't have lamemp3enc installed. In fact if I try a general pipe as:

gst-launch-0.10 -e audiotestsrc ! audioconvert ! lamemp3enc ! filesink
location=audio.mp3

I get:
WARNING: erroneous pipeline: no element "lamemp3enc"

How can I install it from the command line? I am using a raspberry Pi 3 with
Raspbian GNU/Linux 8.0 (jessie).



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[piti_wity]

Thanks a lot for the reply!

Did you select mp3 format?
Yes I did

and if so, do you have lamemp3enc element installed?
No, I haven't. Infact I tried to run a generic pipelline with lamemp3enc:

gst-launch-1.0 -v audiotestsrc wave=sine num-buffers=100 ! audioconvert !
lamemp3enc ! filesink location=sine.mp3

and I got an error saying that it is not present.

However, I tried different ways to install the related plugins, but I have
always error on locating packages. I am using a Raspberry pi 3 with
Raspbian GNU/Linux 8.0 (jessie) on it.



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[piti_wity]

UPDATE: I have found the correct packages, however now I get a different
error concerning the media type. I attach a screenshot, so that on the left
you can find all the parameters.

<http://gstreamer-devel.966125.n4.nabble.com/file/t377998/Schermata_da_2017-09-28_15-40-15.png>



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[Nicolas Dufresne-5]

Le jeudi 28 septembre 2017 à 01:25 -0700, piti_wity a écrit :

> Thanks for your reply Nicolas.
>
> I did select mp3 as format, and I think that you are right, the
> problem is
> that I don't have lamemp3enc installed. In fact if I try a general
> pipe as:
>
> gst-launch-0.10 -e audiotestsrc ! audioconvert ! lamemp3enc !
> filesink
> location=audio.mp3
>
> I get:
> WARNING: erroneous pipeline: no element "lamemp3enc"
>
> How can I install it from the command line? I am using a raspberry Pi
> 3 with
> Raspbian GNU/Linux 8.0 (jessie).

You need to install gst-plugins-ugly (package name may vary, search
using "apt search plugins-ugly").

Nicolas
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[piti_wity]

Thanks, I installed the correct plugin, but now I have problem about the
media type, I attached a screenshot in the previous reply.



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[Stefan Sauer]

On 09/28/2017 03:40 PM, piti_wity wrote:
> UPDATE: I have found the correct packages, however now I get a different
> error concerning the media type. I attach a screenshot, so that on the left
> you can find all the parameters.
>
> <http://gstreamer-devel.966125.n4.nabble.com/file/t377998/Schermata_da_2017-09-28_15-40-15.png>
>
>
I would report this on the ros-audio package. Only likely explanation is
insufficient error handling on the ros-node.

Stefan
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[piti_wity]

Thanks Stefan, I have reported the error more than a week ago, still no
responses.

Hope they will find out something.



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[Stefan Sauer]

On 10/04/2017 11:56 AM, piti_wity wrote:
> UPDATE: I manage to solve the ros problem, now I have another error as:
>
> [ERROR] [1507110828.315476430]: gstreamer: Could not open audio device for
> recording.
Could you rerun your command with GST_DEBUG="*:3" this will give us more
infomation, in particullar which audio device it tried to open - the
"*:3" means all categories and the 3 is everything up to FIXME (1=ERROR,
2=WARNING, 3=FIXME).

Stefan

> Any idea of that? I attach the screenshoot
>
> <http://gstreamer-devel.966125.n4.nabble.com/file/t377998/Schermata_da_2017-10-04_11-53-54.png>
>
>
>
>
>
>
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