Update RenderingMode.hx

Author: SomeGuyWhoLovesCoding

src/ffmpeg/RenderingMode.hx

@@ -352,7 +352,7 @@ class RenderingMode {
 			// Map buffer for faster access (optional optimization)
 			try {
 				// Use getBufferSubData for compatibility
-				GL.bufferData(pboTarget, frameSize, buffer, 0x88E2);
+				GL.bufferData(pboTarget, frameSize, buffer, GL.STREAM_COPY);
 				GL.bindBuffer(pboTarget, null);
 
 				// Enqueue frame