[LAU] RPi based audio metering device (EBU R128 etc.)

laulau till at www.n0ne.de
Thu Aug 20 20:03:13 UTC 2015

Hey Robin & Fons,

thanks for the replies.
Robin: I must admit that i didn't know the RPi is capable of OpenGL. I
have the "old" RPi (B Version) but as far as i googled, it could do
OpenGL as well, so i will try to run LV2.

Fons: i found your jmeters before and obviously it is great that they
have correct response. I must admit though, that i am not a big fan of
the analog meter style (probably i am just not used to it) and i didnt
find the digital style jackmeters have, or is it already there but just
not documented?

At the TV station i work at we have the RTW TM7

Robin: I never quite understood advantage of the loudness radar which
the RTW device also feautres vs. a horizontal way of displaying the
programs loudness... i think something like the ebumeter combined with
yass oscilloscope (with an additional timescale) would be perfect to get
a quick overview of the dynamic range...

To both of you thanks for your excellent work, i try to get the
"perfect" layout figured out.


Am 20.08.15 um 19:25 schrieb Robin Gareus:
> On 08/20/2015 12:21 PM, laulau wrote:
>> Hello List,
>> i am new to this list so forgive if this has been discussed before - a
>> quick search of the archives didnt reveal anything relevant.
>> I am trying to build an audio metering device (stereo only for now),
>> with the purpose of monitoring my video editing system. Right now this
>> is based on a RPi running Arch Linux ARM. As the window manager i
>> decided for i3 tiling WM. The RPi has a 7" 800x480 Touchscreen connected
>> (to be able to reset EBU R128 measuring Keyboard and Mouse-less). As a
>> soundcard i am using the Behringer U-Control UCA222, connected to a
>> Samson C-Control as the audio splitter for speaker monitoring etc.
>> As the software i am playing with the ebumeter, yass & jaaa from Kokkini
>> Zita (http://kokkinizita.linuxaudio.org/linuxaudio/). I installed the
>> jackmeterbridge tools as well.
>> I am still trying to figure out what software will be useful in "real
>> life" situation, meaning what is the RPi capable of handling CPU wise
>> (jaaa pushed it to its limits naturally).
>> - So i wondering, has anyone done something similar before and can share
>> his / her experiences?
>> - Are there other software tools that i have missed that would be worth
>> looking at?
> https://github.com/x42/meters.lv2 (if you have a new RPi with openGL,
> debian package: x42-plugins) and https://github.com/jiixyj/libebur128/
>> - Especially screen estate is a problem with a 800x480 pixel screen.
>> Jass fits barely, ebumeter is super small etc. Is there a way to scale
>> fixed width tools differently to make a nicer screen layout?
>> best,
>> t.
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