remotion-dev/remotion · error · Error

Contour lines program link failed: ${log ?? '(no log)'}

Error message

Contour lines program link failed: ${log ?? '(no log)'}

What it means

Thrown by linkProgram in contour-lines.ts when gl.getProgramParameter(program, gl.LINK_STATUS) returns false. The vertex and fragment shaders compiled but could not be linked into a working program. The info log from gl.getProgramInfoLog() is included. Since both shaders are library constants, a link failure is a driver/GPU compatibility issue, not a user parameter problem.

Source

Thrown at packages/effects/src/contour-lines.ts:385

};

const linkProgram = (
	gl: WebGL2RenderingContext,
	vs: WebGLShader,
	fs: WebGLShader,
): WebGLProgram => {
	const program = gl.createProgram();
	if (!program) {
		throw new Error('Failed to create WebGL program');
	}

	gl.attachShader(program, vs);
	gl.attachShader(program, fs);
	gl.linkProgram(program);
	if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {
		const log = gl.getProgramInfoLog(program);
		gl.deleteProgram(program);
		throw new Error(`Contour lines program link failed: ${log ?? '(no log)'}`);
	}

	return program;
};

const createProgram = (
	gl: WebGL2RenderingContext,
	vertexSource: string,
	fragmentSource: string,
): WebGLProgram => {
	const vs = compileShader(gl, gl.VERTEX_SHADER, vertexSource);
	const fs = compileShader(gl, gl.FRAGMENT_SHADER, fragmentSource);
	const program = linkProgram(gl, vs, fs);
	gl.deleteShader(vs);
	gl.deleteShader(fs);
	return program;
};

View on GitHub (pinned to 78fe4bb3fd)

Solutions

1. Update GPU drivers.
2. Test on a different GPU or browser to isolate driver-specific linker bugs.
3. For headless rendering, use a Chrome build with full WebGL2/SwiftShader support.
4. Report the info log to Remotion with GPU/driver details if it reproduces on modern hardware.

try {
  contourLines({...})(source, target);
} catch (e) {
  if (e instanceof Error && e.message.startsWith('Contour lines program link failed')) {
    // driver-specific linker issue — capture info log from message
  }
  throw e;
}

When it happens

Trigger: setupContourLines compiles both shaders, creates a program, attaches the shaders, calls gl.linkProgram(), and LINK_STATUS is false. Internal to the contour-lines WebGL pipeline setup.

Common situations: Vertex/fragment shader interface mismatch on a strict driver (e.g. varying/in-out declarations, precision qualifiers); GPU driver bug in the program linker; incomplete WebGL2 implementation that compiles shaders individually but fails cross-shader validation; running on older mobile GPU drivers.

Related errors

• Contour lines shader compile failed: ${log ?? '(no log)'}
• Shader compile failed: ${log ?? '(no log)'}
• Program link failed: ${log ?? '(no log)'}
• Noise shader compile failed: ${log ?? '(no log)'}
• Paper shader compile failed: ${log ?? '(no log)'}

AI-assisted analysis of remotion-dev/remotion@78fe4bb3fd (2026-08-12). Data as JSON: /api/errors/6d82c729a1e40484. Report an issue: GitHub.