cross-compile getting started
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I had success with compiling the packages for omega.
Here you can find kmod-sound-core_3.18.23-1_ar71xx.ipk and kmod-usb-audio_3.18.23-1_ar71xx.ipk.
Install them with
opkg --force-depends install kmod-sound-core
opkg --force-depends install kmod-usb-audio
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@Thomas-Jones I get this:
Installing kmod-usb-audio (3.18.23-1) to root...
Configuring kmod-usb-audio.
failed to find dependency input-core
failed to find dependency input-core
failed to find dependency input-core
4 modules could not be probed- snd
 - snd-rawmidi
 - snd-seq-device
 - snd-usbmidi-lib
failed to find dependency input-core
failed to find dependency input-core
failed to find dependency input-core
failed to find dependency input-core
failed to find dependency input-core
failed to find dependency input-core
failed to find dependency input-core
failed to find dependency input-core
failed to find dependency input-core
failed to find dependency input-core
8 modules could not be probed - snd
 - snd-hwdep
 - snd-pcm
 - snd-rawmidi
 - snd-seq-device
 - snd-timer
 - snd-usb-audio
 - snd-usbmidi-lib
Collected errors: 
- satisfy_dependencies_for: Cannot satisfy the following dependencies for kmod-usb-audio:
 - kernel (= 3.18.23-1-735bbd0a915906145eb1b3fec1a6ff8b) *
 
did you have success with usb sound card audio? I mean, can you play sound with omega

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Hi,
as I already wrote in this thread, yes I had success and I can hear music via usb audio device.
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finally some hope

do you know why i get these errors or how to load these modules, can you also upload kmod-input-core?
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I've uploaded kmod-input-core_3.18.23-1_ar71xx.ipk now in the same dropbox.
Also I've added a small video (sorry for the poor quality), to see onion omega running squeezelite in autostart and playing music

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Thomas you are my hero, i love you

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Is it working now for you?
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yes, and i have been struggling with this for days now, installed a bunch of crap and now i have to figure out how to clean it all up so i can run my node server with mp3 player, you have no idea how good it felt to hear the sound after days of googling, compiling, installing and removing modules.
I just hope I'll be able to return the favour some day
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Great to hear, that I could help someone.
Which node server do you want to use on the omega?
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i'm writing my own lightweight server for audio streaming, currently i've made frontend client which decodes mp3 file and send buffer to server, now i'm trying to write that buffer to a file and stream it with madplay on omega. Some future plan is to add sd card or some other data storage so i can queue more files or save songs which finish streaming and add them to some playlist