video embedding fails - #165

try:
            signer_info = C2paSignerInfo(
                alg=b"ps256",
                sign_cert=cert_chain,
                private_key=private_key,
                ta_url=b"http://timestamp.digicert.com"
            )
            signer = Signer.from_info(signer_info)
        except Exception as e:
            logger.error(f"Error creating signer: {e}")
            raise RuntimeError(f"Error creating signer: {e}") from e
        logger.info(f"signer created in {time.time()} duration {time.time() - starttime}")
        # Create a builder add a thumbnail resource and an ingredient file.
        builder = Builder(manifest)

with open(image_path, "rb") as source_file, open(output_path, "wb") as dest_file:
            manifest_bytes = builder.sign(signer, mime_type, source_file, dest_file)