How to run a script right after starting retroarch?

danbgreek

I need to run a python script automatically right after starting retroarch. Does anyone know how I can do this?

Atari

https://wiki.batocera.org/launch_a_script

danbgreek

I’ve seen the wiki but I’ve only seen cases where the script runs before retroarch starts. I’d like it to run after retroarch launches, or better yet, every time the screen resolution changes.

Atari

Don’t be vague when asking for help. Be specific about what you want to do. https://dontasktoask.com/

Technically, you could still use those scripts to do exactly what you need to do. You’d just need to delay it until after RetroArch has launched. But I suspect that you don’t even need to do that for what you want to achieve.

danbgreek

Sorry if my question seemed vague.

What I need is to run this script “https://github.com/kFYatek/tweakvec/blob/main/tweakvec.py” to reconfigure the composite video encoder on the Raspberry Pi to produce the proper PAL-M signal evey time that there is a resolution change. (the rasp firmware does not produce color when sdtv_mode=3 is set in config.txt and when changing resolution from 480i to 240p or from 240p to 480i the tweakvec effects disappear).

But if I can delay running this script until retroarch has run, I believe it will work too.

danbgreek

I managed to solve the problem. I used the “gameStart” event and called a shell script in parallel (If the script was not run in parallel, retroarch would only start after the shell script was fully executed).

/userdata/system/scripts/first_script.sh

#!/bin/bash

case $1 in

gameStart)

/userdata/system/setpal-m.sh &

;;

esac

And I delayed the execution of the python script.

/userdata/system/setpal-m.sh

#!/bin/bash

sleep 1

python3 /userdata/system/tweakvec.py --preset PAL-M

Thanks @Atari for the idea.

Atari

Cool, I’m glad you were able to sort it out.

So this script is required to be run every time RetroArch launches, as RetroArch apparently changes the resolution… are you using switchres? I believe that would be set up to automatically manage all of this stuff for you if set up correctly. I’m not a CRT expert though so maybe I’m wrong about its intended function.

I’m also cautious about claiming that RetroArch changes the resolution as by all means, the way Batocera has been coded, should explicitly prevent RetroArch from being able to change the resolution or rotation of the display. But I can’t argue against behaviours which you are actually observing, maybe there are some bugs at play here causing this behavioural discrepancy.