Video Intellence API - Calculation Error - Request task has error from parents.

[mota]

Hello All,

In our team we have been using video intelligence API for speech transcription. 

The API was running fine for about a year now. However lately we have been getting below error - 

annotation_results {
  input_uri: "/prd_gcpvideo/video.mp4"
  error {
    code: 13
    message: "Calculator error."
    details {
      type_url: "type.googleapis.com/google.rpc.Status"
      value: "\010\t\022$Request task has error from parents."
    }
    details {
      type_url: "type.googleapis.com/google.rpc.Status"
      value: "\010\t\022&Operation task has error from parents."
    }
  }
}

The error is intermittent that means for about 20 tries to video intelligence API about 15 fails and another 5 are successful in giving transcripts. 

The videos that we process are of around 1.4 Gb. 

Does anyone know where might be the problem ? 

This are the things that I have already tried without success  -

1. updating video intelligence to latest version