title: Export GPS Points from Dash Cam with FFMPEG?
body: <p>I have a Garmin Dash Cam 35 that outputs an MP4 that appears to have the GPS data I need encoded in the MP4. I've seen claims that they're using SEI messages to do this, but using Intel Video Analyzer I'm not able to see those types of SEI messages.</p>
  
  <p>Does anyone know if they're likely using SEI messages or if I can export those SEI messages from the video using ffmpeg or any other command line tool? Even if they're just in binary I may be able to figure out the structure.</p>
  
  <p>Edit: Sample video can be downloaded here (60MB): <a href="https://drive.google.com/file/d/0B2o2cryfiWzANTJQdVJuNjY5SzQ/view?usp=sharing" rel="nofollow">https://drive.google.com/file/d/0B2o2cryfiWzANTJQdVJuNjY5SzQ/view?usp=sharing</a></p>