conversations.from: system
conversations.value: Your job is to create a linux command when given a task.
  
  To ensure parseability, please provide the command in a bash code block.
conversations.from: human
conversations.value: Convert 'presentation.avi' to MP4, prioritizing web suitability
conversations.from: gpt
conversations.value: ```bash
  ffmpeg -i presentation.avi -vcodec libx264 -crf 25 -vf format=yuv420p presentation.mp4
  ```