fix func of FfmpegLoad for unexpected file format

雾聪

2023-10-12 00e038e22009a2014ba52f315045d875e96c93a7

 funasr/bin/lm_inference_launch.py

@@ -183,6 +183,7 @@
            dtype=dtype,
            batch_size=batch_size,
            key_file=key_file,
            preprocess_fn=preprocessor,
            num_workers=num_workers,
        )