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: Optimize 'slideshow_presentation.mp4' for streaming while maintaining decent quality
conversations.from: gpt
conversations.value: ```bash
  ffmpeg -i slideshow_presentation.mp4 -vcodec libx264 -crf 25 output.mp4
  ```