it is some where between 30 and 39 after that it just plays music disc 11

to be precise it is 35

I generated a stress-test datapack with 158 discs and all of them played fine. You must have something else going wrong.

The problem is with the pack file size:

[STDERR]: java.io.IOException: Filesize is bigger than maximum allowed (file is 6.0, limit is 104857600)
[STDERR]: 	at agw.a(SourceFile:170)
[STDERR]: 	at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1764)
[STDERR]: 	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
[STDERR]: 	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
[STDERR]: 	at java.base/java.lang.Thread.run(Thread.java:831)

You must have tested it with small files only. Is there a way to increase this setting?

You must have tested it with small files only. Is there a way to increase this setting?

Maybe, what do you consider "small"? My stress-test pack is 1GB, with an average file size of 7MB. I just added a 49MB white noise track to the pack with no apparent issues.

Maybe Minecraft is running out of memory. You could try allocating more memory to the game using JVM arguments in the launcher. There are lots of guides online for how to do it. 2 or 3 GB is probably enough.

Okay, that's weird. Mine only has 115MB.
Chaging the memory to 4G didn't change anything, the log still says Limit is 104857600B, around 100MB.

Okay I just realized what the problem is while writing this. You're testing this as a singleplayer resource pack, aren't you? Singleplayer resource packs don't limit the file size.
But server resource packs do. If I set the resource-pack option in the server.properties file to my resource pack that is larger than 100MB, the Minecraft client refuses to download the file as it considers it to be too large.

Well, then I'll have to limit myself to 100MB for my server.

Thank you so much for creating this tool by the way! It's so cool!

Ah, that makes sense. I do test in singleplayer, or with a localhost server. If your playerbase is small you could distribute the pack through a side channel like Discord.

Glad you like the tool! It fills a need a lot of players have, I think.

Sorry for reviving this, but there is some good News about this:
Mojang just released an update where they increase the max server resourcepack size from 100 to 250mb!
https://www.minecraft.net/de-de/article/minecraft-1-18-release-candidate-1