Analyze the following video and give me a list of timestamps where it is just the rapper Eminem in the frame, and he is the only person speaking. Then transcribe the speech in that section of the clip. Format the response in a json array structure of start_time, end_time, only_eminem, and speech as two timestamps, a boolean, and a string. For example:

[
  {
    "start_time": 0.0,
    "end_time": 1.0,
    "only_eminem": false,
    "speech": "And how did that make you feel"
  },
  {
    "start_time": 1.0,
    "end_time": 3.2,
    "only_eminem": true,
    "speech": "I mean, man, it felt really good!"
  }
]

Only respond with the json structure of the timestamps, only eminem, and speech transcription, nothing else.