Posts by py9399

Thanks for your answers. i'll report here improvements.

i have to edit config.txt to be able to use analog audio ?
does this provide a predictable, repeatable delay ?

hello, thanks for your reply

yes,synchronous playback of multi screen projection (artist movie made for two screens)

and i somewhat i managed to do it (since yesterday ) , but only if sound is removed from the video file.
it seems a lot of things happen on hdmi for handshake of sound equipement ( buffering+ ??)

i was using passthrough for sound on hdmi to a audio toslink extractor , it seems it was the source of my problem .
now i can get two videos playing synchronously.
a third raspberry will read ambient sound . ( almost synched ...)


i used kodi callbacks addon , bash scripts, and had to struggle a bit.
but now i know it's possible.
just has to be improved .
if you know places where i can reach other people, i am sur i am not the first one to try this ..

where should i post these informations ?
it seems like i am not in the most pertinent place .
any ideas ?

just an update /
i tried to send commands from kodi-send and via curl and json rpc .

i get some variable delay on this setup:
i tried to remove every protocols smb , bonjour , since i am on a lan without router now , just fixed IP adresses)

i made a master that only plays sound and sends commands and two slaves : identical setup.
i still get a variable delay , between 1 frame most of the time to sometimes 10 or more ...

what could introduce some variable delay ? ping is very low, (0.3ms)

i wasn't very precise :
i am on a network of raspberry pi 4 with librelec 12.0.2 iirc
there is a router with dhcp on the network , but ip are fixed, and all machines are on the lan side of it.
i play local files that are on each pi, of synchronised loops
i get low values for ping ,

removed buffering , but still have a fluctuating start time ( different when pointer is displayed than when in "full screen"

thanks for any help. it would be a great anbd cheap solution for artists.

Hello,
thanks a lot for libreelec , it works like a charm here.
i used to sync displays via omxplayer and osc udp , but made the change to be able to output 10 bits 4k H265 with aac audio.

i made shell scripts and am currently using kodi callbacks to link multiple players ,
but sync is soso , with high latency compared to what i had before.
any hints ?

did someone tried something in this area ?
Have a nice day.

Py