[1.12.2] DynamicTexture declaration crashes the game

[nocot]

I'm creating a mod based on external libraries that are making snapshots from videos. My goal is to use these snapshots - made as buffered images - to display them in a GUI. My problem is that when an event is converting a buffered image into a dynamic texture, the game eventually crashes. Despite my tryings, I still get the same error with the same function. Here is my crash report:

---- Minecraft Crash Report ----
// You're mean.

Time: 8/1/18 8:10 PM
Description: Exception in server tick loop

java.lang.RuntimeException: No OpenGL context found in the current thread.
	at org.lwjgl.opengl.GLContext.getCapabilities(GLContext.java:124)
	at org.lwjgl.opengl.GL11.glGenTextures(GL11.java:1403)
	at net.minecraft.client.renderer.GlStateManager.generateTexture(GlStateManager.java:465)
	at net.minecraft.client.renderer.texture.TextureUtil.glGenTextures(TextureUtil.java:38)
	at net.minecraft.client.renderer.texture.AbstractTexture.getGlTextureId(AbstractTexture.java:54)
	at net.minecraft.client.renderer.texture.DynamicTexture.<init>(DynamicTexture.java:30)
	at net.minecraft.client.renderer.texture.DynamicTexture.<init>(DynamicTexture.java:20)
	at com.kacpergutowski.rfmod.Main.onPlayerTick(Main.java:144)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_10_Main_onPlayerTick_EntityJoinWorldEvent.invoke(.dynamic)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
	at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182)
	at net.minecraft.world.WorldServer.loadEntities(WorldServer.java:1128)
	at net.minecraft.world.chunk.Chunk.onLoad(Chunk.java:918)
	at net.minecraftforge.common.chunkio.ChunkIOProvider.syncCallback(ChunkIOProvider.java:105)
	at net.minecraftforge.common.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:94)
	at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:130)
	at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:101)
	at net.minecraft.world.gen.ChunkProviderServer.provideChunk(ChunkProviderServer.java:147)
	at net.minecraft.server.MinecraftServer.initialWorldChunkLoad(MinecraftServer.java:383)
	at net.minecraft.server.integrated.IntegratedServer.loadAllWorlds(IntegratedServer.java:143)
	at net.minecraft.server.integrated.IntegratedServer.init(IntegratedServer.java:160)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:552)
	at java.lang.Thread.run(Unknown Source)

I see that it might be a server/client side problem but I cannot see what exactly is  causing that issue.

 

 

Here is my mod code (so minimalist because I'm just trying to investigate the problem):

@Mod(modid = Reference.MOD_ID, name = Reference.NAME, version = Reference.VERSION)
public class Main {
	int i = 0;
	
	@Instance
	public static Main instance;
	
	@SidedProxy(clientSide = Reference.CLIENT_PROXY_CLASS, serverSide = Reference.COMMON_PROXY_CLASS)
	public static CommonProxy proxy;
	
	@EventHandler
	public void PreInit(FMLPreInitializationEvent event)
	{
		
	}
	
	@EventHandler
	public void Init(FMLInitializationEvent event)
	{
		MinecraftForge.EVENT_BUS.register(new com.kacpergutowski.rfmod.events.EventHandler());
		MinecraftForge.EVENT_BUS.register(this);
	}
	
	@EventHandler
	public void PostInit(FMLPostInitializationEvent event)
	{
		
	}
	
	
	 @SideOnly(Side.CLIENT)
	 @SubscribeEvent
	 public void onPlayerTick(EntityJoinWorldEvent evt) throws Exception {
		 
		FFmpegFrameGrabber g = new FFmpegFrameGrabber("C:/Users/Kacper/Documents/file.mp4");
		g.start();
	    Frame f = g.grab();
	    OpenCVFrameConverter.ToIplImage iplConverter = new OpenCVFrameConverter.ToIplImage();
	    IplImage img = iplConverter.convert(f);
	    Java2DFrameConverter paintConverter = new Java2DFrameConverter();
	    BufferedImage image = paintConverter.getBufferedImage(f,1);
	    DynamicTexture texture = new DynamicTexture(image);
		
    }
	
}

Everything is placed in one event just for testing purposes.

 

For sure my problem is obvious, but I still can't get it. Anyone who can help me with it?

[V0idWa1k3r]

No OpenGL context found in the current thread.

You can only call opengl related functions from the render thread. In this case DynamicTexture probably invokes something related to opengl.

 

Also Code-style issue #1.