Here's some notes for people who are kinda dumb like me and just want it to work with what they've already messed up: If you have your roms in .bin/.cue format, call the .cue files in the m3u file, not the .bin. If each Disk's rom files are in their own folder, and you want to call the .m3u outside all of them, you can use relative or absolute pathing and put the file path down instead of just the file name in the .m3u. If you started a bigger game (like FF9 for instance) without realizing you would struggle to switch disks, and want to save your progress, you can. The emulator will make separate saves for every game you open, including the separate disks and any .m3u files used. Launch the .m3u version in the emulator, then close it. Go to the /userdata/saves folder, go to the system you are using, copy the save you have from disk 1 of the game, and then rename it to the same name as the .m3u save uses, and overwrite! When you launch the .m3u version, it will present you with your old save!
For GameCube batocera as of June 2022 now recognizes .m3u files, so adjusting system configs is no longer necessary. Just create the .m3u file as instructed in the video and batocera will do the rest (even hiding the two disk roms automatically).
Just a note for Dolphin: I just discovered the m3u files MUST have a unix line ending.. so m3u files created in windows without special means will not work in batocera for dolphin. Notepad++ or something must be used with settings to make it have a unix line ending. hope this helps someone else.
HUGE thanks for this tip. Was wondering why my GC games were having issues. IF anyone else is having issues with any old M3u files no longer working or are just starting with them then you can create them In the Windows text editing program Notepad++ (NOT the normal Notepad), there is a function to prepare text files with UNIX-style line endings. To do this, while the m3u file is open, go to the Edit menu, select the "EOL Conversion" submenu, and from the options that come up select "UNIX/OSX Format". Then save the file and its line endings will be saved with UNIX-style line endings.
Great video, as always :) So many questions get answered in this channel! Love it! Got a little question off-topic: Is there a possibility to hide unused rom folders, so it's better to see my used ones? I mean in the browser, not in ES. Thanks and greetings
@@Mexx386 Perhaps you can hide the rom with the option under settings. I haven’t tried it yet, but maybe you can create a dummy file, a shortcut, as if you had an external drive that contain the rom.
Your opening comments on Rebel Assault II is exactly the same as what I thought back in the day. Lol Yeah it was a simple rail shooter, and I knew that before purchase but hey, you get to be in the StarWars universe blowing up Tie Fighters right 👍 Btw, did the the 2 discs into 1 PBP work for you on that game? Did it auto switch to disc 2?
@@BatoceraNation Hmm, its gotta work somehow as its well known. Think its a matter of going into retroarch and setting buttons on controller (or keyboard if you cant assign a controller button) to swap virtual disc or something. Dont remember exactly off hand. Edit: Or, it might even be editing a cfg file… sounds to complicated now right lol
I was trying to add Panzer Dragoon Saga. I made the file with the disc names in it. When I went to update the games list, I got stuck in a loop that flashes through all the systems. I'm not that great with computers and can't figure this out. I may have to wipe my drive and start over. I have so much time in my set up. Ugh. I know deleting that file will fix my problem but F1 is unresponsive and I can't find it when connected to windows. Any idea how to fix or why this happened?
oh my!!! i must do this think to play a multi disk game???? i want to play the amiga files but at least 70% of amiga games is 2 and more disks!!!! i need many many days to convert them!!!
Thank you for this tutorial.I am new to batocera,just made my sistem and loading games in it.If i understand the proces for multyple cd is the same as for multiple tracks?Can I put multyple cd files in one folder as we do the tracks?
Interesting. I had read about m3u playlists but never saw them in action. I suppose you have to change the path in the gamelist.xml towards the m3u playlist. Will Libretro Flycast or Redream read them too ?
Once the m3u file is created, the gamelists.xml will be updated automatically. I never messed with it and everything worked. I didn't experiment with Flycast or Redream.
Hello. How do you run Fahrenheit on Sega CD? This is a multi-disc game with the second being 32x CD. You didn't cover this. Any help would be appreciated.
Hey, just a quick question. Planning to play GameCube's Metal Gear Solid The Twin Snakes on Batocera (32 or newest). I see the game has 2 disks and will ask to swap them while you play (no save game in the middle). How would I swap them in Batocera? Many thanks for the awesome channel!
Is the m3u method supported for 3DO? Running Bato V33 on RPI 4 and playing D, reached the end of disc 1 and it will not cutover to disc 2 via the m3u file, nor is there an option for manual disc swapping in retroarch menu. Any guidance is appreciated, thanks!
So correct me if im wrong but this doesnt seem to be very useful if you wanted to put this in kiosk mode for some one who isnt tech savy and they just want a console like experience as they would not have access to the backend like that . right?
Great video ! Thank you it was much help. However game ASTAL is running quite slow, framerate is slow, and music is choppy. Are there any tweaks that would help performance in games that are not running well ? Thanks ^^
The Saturn emulator is very demanding. You will need a good system to play their games. The only tweaks I have are the ones mentioned in the tutorial for Sega Saturn.
@@krathoon2338 yeah depending on the computer I was using, I was able tu run Astal smooth and I finished the game on Batocera using a retrobit wired saturn controller 😊 (also finished Layer section, next in line : Panzer Dragoon !)
What about Amiga ADF disks? Have you got any idea how to resolve multidisk problem? LHA files are a good solution, but unfortunately I don't know how to create it. :)
I finally got the Amiga tutorial done. It will premiere this Saturday, June 12 at 8:00 a.m. CT. Hope it helps. Here is the link scheduled for Saturday: ruclips.net/video/Xj5GVs3PFXY/видео.html
@@BatoceraNation okay I will give it a shot later after dinner thank you and I really like your channel and I appreciate the fact that you take time out to make tutorials for us is amazing my head goes off to you
I have a problem. I have use your methode and the emulator cannot read the save file before the manipulation anymore. Did you a trick for transfer the save file ( and for the information, I'm using a rasberry pi 4 and the core that I was using is the pcsx ReARMed) ?
I suspect that with the transfer method it is reading the .m3u file and no longer the original file name. The save file is named after the original file name. Try saving a new file with the new method. Locate the old saved file and renaming it with the name of the new save file name. But you might run into a problem that it won't let you swap the discs anymore. So it might not work.
@@BatoceraNation I have think about that, but I cannot find my save in the save files in the psx save folder, their is five other file with the name of my game. I have try to rename each file with the name of the game, but it doesn't work. But thank for answering my message.
None of these methods seem to work for the PCSX2... In fact you get very STRANGE behavior if you try it. Think you could post a video of how to get that to work? (I would think it would be just drop to the emulator menu... but that seems to not work at all)
@@BatoceraNation Well, thanks for telling me and I hope to see it (maybe the software will get some updates). There is an a SORTA work around but I'm still trying to get the sound/controls to work (but it's a hassle), fire up the emulator after dropping to the F1 menu and going to apps then doing it like you would in windows. (at least that's the closest I've found)
I can't get the m3u files to work for Gamecube. I've added the file type to the system config and they show up in my games list. But when I select it, it goes to the Dolphin application instead of loading the game. Your tip was to switch off the Multi Disc setting in the Developers settings, which I've done, and it still doesn't work. Thanks.
@@ascalonemazzo8964 Hi, yes I got it to work. Where I was going wrong was using regular Notepad to create the m3u file. I used Notepad ++ and it works fine. For some reason, m3u files created with regular Notepad was fine for the Retroarch systems I use (eg Amiga, PS1), but just didn't work with Dolphin.
The Batocera team is working on the sound. Why don't you upgrade to Batocera 32 Beta. Go into your main menu, select Updates and Downloads, select Update Type, select Beta, and finally select Start Update. It will take a while. Try that and let me know if the audio is working now.
@@BatoceraNation okay I definitely try that I'll get back to you. Do I have to change any bios files or anything like that? I saw your video earlier on v31. Definitely been following your work.
@@BatoceraNation I'm going to try and see what the upgrade looks like. I'll let you know what I find thank you for getting back to my question. Great channel. Tough playing games with no sound. I thought it was maybe a setting. It was just mute.
@@BatoceraNation Thats why I switched to Batocera for my RGB10 Max as well. You can delete roms within Batocera settings and set emulator/core per game. This is a very important and handy feature. I saw no such option when I tester Emuelec, Retro Arena or RetroOz OS's. Possibly if you enter retroarch but cause Emuelec is a ready to go OS you'd also prob need to edit cfg files. Dunno. Some systems may run a little better with a diff OS but but honestly, I think the features and options Batocera has within its own settings is superior overall to the other OS's I tried. Im talking for the RGB10 Max that is. But even for PC is damn awesome too ofcourse. Always needs some adjusting and tweaking and we have updates as well that gives us new features.
@@BatoceraNation But one problem is that Batocera do not support monitors with Raspberry Pi 4 or Odroid N2+. It gives lags on menu ES. When I tested on Samsung tv it gives very smooth. How come that Batocera was never fixed it over 1 year later.
@@CloudOmegaVII As I understand correctly, you're saying that Batocera doesn't work on computer monitors but it does work on TVs when running it on those two systems? If so, I didn't know that. Since I'm not a developer for Batocera, I have no input of what gets fixed or supported in Batocera. However, have you considered getting a Larkbox mini PC? It's about $180 on Amazon and it can play everything that Retropie 4 can and more at better performance. It can even handle some Dolphin games at native resolution. It does cost more than a fully configured Retropie (about $100 more), but it is just as small, more flexible, and more powerful.
![Quando Rondo - Life Goes On [Official Music Video]](http://i.ytimg.com/vi/eIf3fhMXAow/mqdefault.jpg)
Thank you so much. I can confirm that this m3u playlist method works well with Amiga 500 multidisk games.
Glad it helped!
Here's some notes for people who are kinda dumb like me and just want it to work with what they've already messed up:
If you have your roms in .bin/.cue format, call the .cue files in the m3u file, not the .bin. If each Disk's rom files are in their own folder, and you want to call the .m3u outside all of them, you can use relative or absolute pathing and put the file path down instead of just the file name in the .m3u.
If you started a bigger game (like FF9 for instance) without realizing you would struggle to switch disks, and want to save your progress, you can. The emulator will make separate saves for every game you open, including the separate disks and any .m3u files used. Launch the .m3u version in the emulator, then close it. Go to the /userdata/saves folder, go to the system you are using, copy the save you have from disk 1 of the game, and then rename it to the same name as the .m3u save uses, and overwrite! When you launch the .m3u version, it will present you with your old save!
Thanks for this!
Thanks a lot!
Awesome work. Really wish the PSX emus had automatic changing of disk like the gamecube. Really looking forward to the DOS support!
You and me both!
The DOS tutorial is ready: ruclips.net/video/zFEaSU8A89M/видео.html
Are M3U files working for PS2 ? Thanks. Great content.
Great video. I was waiting for this one :) That was really useful.
Glad to hear it!
For GameCube batocera as of June 2022 now recognizes .m3u files, so adjusting system configs is no longer necessary. Just create the .m3u file as instructed in the video and batocera will do the rest (even hiding the two disk roms automatically).
You're correct. I haven't updated the tutorial. This makes life easier.
@@BatoceraNation so for psx/bin files i don't need to make m3u? I should automatically select disc from menu?
Can you create the .m3u file with .rvz compressed roms?
Just a note for Dolphin: I just discovered the m3u files MUST have a unix line ending.. so m3u files created in windows without special means will not work in batocera for dolphin. Notepad++ or something must be used with settings to make it have a unix line ending. hope this helps someone else.
HUGE thanks for this tip. Was wondering why my GC games were having issues.
IF anyone else is having issues with any old M3u files no longer working or are just starting with them then you can create them In the Windows text editing program Notepad++ (NOT the normal Notepad), there is a function to prepare text files with UNIX-style line endings.
To do this, while the m3u file is open, go to the Edit menu, select the "EOL Conversion" submenu, and from the options that come up select "UNIX/OSX Format". Then save the file and its line endings will be saved with UNIX-style line endings.
Thx Bro💪👍👍👍
Un grand merci à vous. Merci voilà débloquer pour la suite de metal gear ! 🎉🎉🎉
Thanks again, another crystal clear tutorial.
Keep up the good work, I'm interested in ur next video, I'm still converting my roms, lool, I have save around 50 GBS from psp. : V
Wow! That's a lot of PSP! I plan to have my next video up by Friday or Saturday of this week.
Excellent.very good
Great video, as always :)
So many questions get answered in this channel! Love it!
Got a little question off-topic:
Is there a possibility to hide unused rom folders, so it's better to see my used ones? I mean in the browser, not in ES.
Thanks and greetings
Thanks! Unfortunately not. Even if you try to delete them, they keep coming back like zombies!
@@BatoceraNation
Yeah I noticed that, they even come with the preinstalled romes back :D
@@Mexx386 Yes.
@@Mexx386 Perhaps you can hide the rom with the option under settings. I haven’t tried it yet, but maybe you can create a dummy file, a shortcut, as if you had an external drive that contain the rom.
I tried .m3u with dolphin before but missed changing the system.cfg. This is good to know. Now I just need to figure out PS2.
PS2 disc changing? Or something else?
@@BatoceraNation Well pretty sure I can swap discs. The issue is that I only want one entry in the games list. In other words one boxart per game.
@Blitzen Well we can already hide the other files in es. I was under the impression that PCSX 2 does not support .m3u. Am I mistaken?
No work m3u PS2 please🙏🙏
كفووووو الوحش اشكرك جدا❤
Your opening comments on Rebel Assault II is exactly the same as what I thought back in the day. Lol
Yeah it was a simple rail shooter, and I knew that before purchase but hey, you get to be in the StarWars universe blowing up Tie Fighters right 👍
Btw, did the the 2 discs into 1 PBP work for you on that game? Did it auto switch to disc 2?
Too funny!! As to your question: It didn't work. I was forced to convert it to chd format. That's why I did the rom compression tutorial first.
@@BatoceraNation
Hmm, its gotta work somehow as its well known.
Think its a matter of going into retroarch and setting buttons on controller (or keyboard if you cant assign a controller button) to swap virtual disc or something.
Dont remember exactly off hand.
Edit: Or, it might even be editing a cfg file… sounds to complicated now right lol
@@fonzitheman You're funny!
After active batocera kiosk at main menu.Then can’t access to quick menu for use cheat mode .load new disc [for psx] .So pls advise
How do you clean up multi disc entries for PS2 games?
please how do you restore the game files that have been hidden?
I was trying to add Panzer Dragoon Saga. I made the file with the disc names in it. When I went to update the games list, I got stuck in a loop that flashes through all the systems. I'm not that great with computers and can't figure this out. I may have to wipe my drive and start over. I have so much time in my set up. Ugh. I know deleting that file will fix my problem but F1 is unresponsive and I can't find it when connected to windows. Any idea how to fix or why this happened?
Hey bro, can you do this tutorial again for Batocera version 40?
Greetings from Brazil
oh my!!! i must do this think to play a multi disk game???? i want to play the amiga files but at least 70% of amiga games is 2 and more disks!!!! i need many many days to convert them!!!
Which video of yours should I watch to learn how to compress PSX ISOs?
This one: ruclips.net/video/nlOzdRGwJjY/видео.html
Thank you for this tutorial.I am new to batocera,just made my sistem and loading games in it.If i understand the proces for multyple cd is the same as for multiple tracks?Can I put multyple cd files in one folder as we do the tracks?
I'm having a problem with deep fear the survival horror to change discs on game. It's not on the same rom file like panzer dragoon saga. What do I do?
I did it for the gamecube exactly as in the video. Unfortunately I only get a short black screen via batocera and I can get back to the overview :(
Interesting. I had read about m3u playlists but never saw them in action. I suppose you have to change the path in the gamelist.xml towards the m3u playlist. Will Libretro Flycast or Redream read them too ?
Once the m3u file is created, the gamelists.xml will be updated automatically. I never messed with it and everything worked.
I didn't experiment with Flycast or Redream.
Hello. How do you run Fahrenheit on Sega CD? This is a multi-disc game with the second being 32x CD. You didn't cover this. Any help would be appreciated.
Hey, just a quick question. Planning to play GameCube's Metal Gear Solid The Twin Snakes on Batocera (32 or newest). I see the game has 2 disks and will ask to swap them while you play (no save game in the middle). How would I swap them in Batocera? Many thanks for the awesome channel!
Does the method shown in the video not work for 2 discs games? I haven't tried it but I had assumed it would work the same.
Is the m3u method supported for 3DO? Running Bato V33 on RPI 4 and playing D, reached the end of disc 1 and it will not cutover to disc 2 via the m3u file, nor is there an option for manual disc swapping in retroarch menu. Any guidance is appreciated, thanks!
Do I have to leave both disks in main ROM directory? or can I have them both in folder?
Done this for dragoon but my save file has gone how do I make it read the save I don't want to start again
Have they removed the option to do this for GameCube? O have the emulator window appearing instead of the game launching when I select the m3u file
In System Settings look for Develper. Then look for "Ignore Multifile Disk Content" make sure it is turned off and try again.
So correct me if im wrong but this doesnt seem to be very useful if you wanted to put this in kiosk mode for some one who isnt tech savy and they just want a console like experience as they would not have access to the backend like that . right?
You're correct since you need to access Retroarch's menu. But that's true only for 2 CDs games.
Does this work for bin and cue files?
I tried using the theme you use and it behave s a little weird. It has a blank screen when I select a system.
It has been acting flakey lately on some systems. On those systems, I'm forced to use a different theme. Check out Artflix. It looks really cool.
Great video ! Thank you it was much help. However game ASTAL is running quite slow, framerate is slow, and music is choppy. Are there any tweaks that would help performance in games that are not running well ?
Thanks ^^
The Saturn emulator is very demanding. You will need a good system to play their games. The only tweaks I have are the ones mentioned in the tutorial for Sega Saturn.
@@BatoceraNation I upgraded m'y graphics card and its ok now. Astal is running smooooth !! Thanks again for your videos 👌👍👌
Oh. Astal works on this? It does not work on Emuelec. I am beginning to think Batocera is better.
@@krathoon2338 yeah depending on the computer I was using, I was able tu run Astal smooth and I finished the game on Batocera using a retrobit wired saturn controller 😊 (also finished Layer section, next in line : Panzer Dragoon !)
how do u get boxart for multi disk games
Please make a Video how to install any graphics card in batocera os
For AMD, you don't need to do anything. It's automatic. For Nvidia, check out my video "How to Setup RPCS3 in Batocera" (around the 5 minutes mark).
What about Amiga ADF disks? Have you got any idea how to resolve multidisk problem? LHA files are a good solution, but unfortunately I don't know how to create it. :)
I haven't looked into the Amiga yet. I plan to and will research it before I put out a video. In about 2 weeks or so.
I finally got the Amiga tutorial done. It will premiere this Saturday, June 12 at 8:00 a.m. CT. Hope it helps.
Here is the link scheduled for Saturday:
ruclips.net/video/Xj5GVs3PFXY/видео.html
i cant find game options on new ver of batocera? or edit games metadata help plz
Hold down the A button on your game pad for a few seconds. Then you will see it.
@@BatoceraNation okay I will give it a shot later after dinner thank you and I really like your channel and I appreciate the fact that you take time out to make tutorials for us is amazing my head goes off to you
I have a problem.
I have use your methode and the emulator cannot read the save file before the manipulation anymore. Did you a trick for transfer the save file ( and for the information, I'm using a rasberry pi 4 and the core that I was using is the pcsx ReARMed) ?
I suspect that with the transfer method it is reading the .m3u file and no longer the original file name. The save file is named after the original file name. Try saving a new file with the new method. Locate the old saved file and renaming it with the name of the new save file name. But you might run into a problem that it won't let you swap the discs anymore. So it might not work.
@@BatoceraNation I have think about that, but I cannot find my save in the save files in the psx save folder, their is five other file with the name of my game. I have try to rename each file with the name of the game, but it doesn't work. But thank for answering my message.
@@sachatherpg-booksguy8269 I was afraid of that. If it doesn't work, it means that the old save is not compatible with the new save file.
I cant get it to work on drem cast, its resident evil code Veronica, I’ll hope I just have to swap disk when I get to that 😬
None of these methods seem to work for the PCSX2... In fact you get very STRANGE behavior if you try it. Think you could post a video of how to get that to work? (I would think it would be just drop to the emulator menu... but that seems to not work at all)
I avoided the PCSX2 in this tutorial because I couldn't find a solution. If and when I find a solution then I will create a video.
@@BatoceraNation Well, thanks for telling me and I hope to see it (maybe the software will get some updates). There is an a SORTA work around but I'm still trying to get the sound/controls to work (but it's a hassle), fire up the emulator after dropping to the F1 menu and going to apps then doing it like you would in windows. (at least that's the closest I've found)
I can't get out of the GameCube system with any button, how do I go back to main selection
Hot Key and your start button. You set those up in Bluetooth and Controllers in the Menu System Settings.
Or ctrl w on keyboard
How do you set the box art to show when the game is loading up like at 6:28? I can’t find that option anywhere.
I used the Scraper. I have 2 different tutorials for the two different apps available to scrape.
@@BatoceraNation ok I’ll check it out thanks!
I can't get the m3u files to work for Gamecube. I've added the file type to the system config and they show up in my games list. But when I select it, it goes to the Dolphin application instead of loading the game.
Your tip was to switch off the Multi Disc setting in the Developers settings, which I've done, and it still doesn't work. Thanks.
Hi Retro Nostalgia , did you find a solution for it ? i tried several ways but no luck so far
@@ascalonemazzo8964 Hi, yes I got it to work. Where I was going wrong was using regular Notepad to create the m3u file. I used Notepad ++ and it works fine.
For some reason, m3u files created with regular Notepad was fine for the Retroarch systems I use (eg Amiga, PS1), but just didn't work with Dolphin.
@@retronostalgia5104 omg thanks for the tip , i will try immediately
@@retronostalgia5104 I confirm also that it works if the m3u file is created from the file manager in Batocera
@@ascalonemazzo8964 That's great. Glad you got it working.
3DO doesn't has disc swap option :/ Do you know how to swap 3do discs?
Honestly don't know since I haven't played with 3DO yet.
This doesn't work with folder format bin & cue
How to do this with Amiga adf?
Tutorial for pc no controller please
What is the "hack key"?
Hotkey.
Como faz para ejetar disc in duckstation in rasp4 no controle de ps3
With Duckstation you have to use the stand alone version found in Applications. But I don't know if it is accessible in the Pi4.
good tutorial, but time stamps would be appriaciated
Thanks for the suggestion.
Hi, how UNhide files?
I'm still trying to figure out how to get the sound turned on.
The Batocera team is working on the sound. Why don't you upgrade to Batocera 32 Beta. Go into your main menu, select Updates and Downloads, select Update Type, select Beta, and finally select Start Update. It will take a while. Try that and let me know if the audio is working now.
@@BatoceraNation okay I definitely try that I'll get back to you. Do I have to change any bios files or anything like that? I saw your video earlier on v31. Definitely been following your work.
@@apap7170 Just install Bios files for Batocera 31. If you have it, you should be ok.
@@BatoceraNation My biggest goal has been trying to get that PS2 to work. Retro Arch , batocera, Any one I can get working.
@@BatoceraNation I'm going to try and see what the upgrade looks like. I'll let you know what I find thank you for getting back to my question. Great channel. Tough playing games with no sound. I thought it was maybe a setting. It was just mute.
How to Swap Game Dreamcast Discs in Batocera?
But emuelec has no "edit metadata"
You can't change settings or files in Emuelec? If so, consider Batocera. There is so much that you can do in Batocera.
@@BatoceraNation
Thats why I switched to Batocera for my RGB10 Max as well.
You can delete roms within Batocera settings and set emulator/core per game. This is a very important and handy feature.
I saw no such option when I tester Emuelec, Retro Arena or RetroOz OS's. Possibly if you enter retroarch but cause Emuelec is a ready to go OS you'd also prob need to edit cfg files.
Dunno.
Some systems may run a little better with a diff OS but but honestly, I think the features and options Batocera has within its own settings is superior overall to the other OS's I tried.
Im talking for the RGB10 Max that is.
But even for PC is damn awesome too ofcourse.
Always needs some adjusting and tweaking and we have updates as well that gives us new features.
@@BatoceraNation But one problem is that Batocera do not support monitors with Raspberry Pi 4 or Odroid N2+. It gives lags on menu ES. When I tested on Samsung tv it gives very smooth.
How come that Batocera was never fixed it over 1 year later.
@@CloudOmegaVII As I understand correctly, you're saying that Batocera doesn't work on computer monitors but it does work on TVs when running it on those two systems? If so, I didn't know that. Since I'm not a developer for Batocera, I have no input of what gets fixed or supported in Batocera. However, have you considered getting a Larkbox mini PC? It's about $180 on Amazon and it can play everything that Retropie 4 can and more at better performance. It can even handle some Dolphin games at native resolution. It does cost more than a fully configured Retropie (about $100 more), but it is just as small, more flexible, and more powerful.
... why in HELL would they make it some big secret just to swap disc? Then you look on RUclips and find out it's a big complicated undertaking.
Every emulator is different and Retroarch has its own procedure. So Batocera is going with how Retroarch and the emulators handle it.
Anyone trying this with PS2 games - it won't work. Hope I save someone some time!