fix func of FfmpegLoad for unexpected file format

雾聪

2023-10-12 00e038e22009a2014ba52f315045d875e96c93a7

 funasr/runtime/triton_gpu/model_repo_paraformer_large_offline/feature_extractor/config.pbtxt

@@ -34,6 +34,10 @@
    value: { string_value: "16000"}
  },
  {
    key: "cmvn_path"
    value: { string_value: "./model_repo_paraformer_large_offline/feature_extractor/am.mvn"}
  },
  {
    key: "config_path"
    value: { string_value: "./model_repo_paraformer_large_offline/feature_extractor/config.yaml"}
  }