function runFfprobe(command) {
  const inputProbeIndex = 0;
  if (command._inputs[inputProbeIndex].isStream) {
    // Don't probe input streams as this will consume them
    return;
  }
  command.ffprobe(inputProbeIndex, function(err, data) {
    command._ffprobeData = data;
  });
}
Run ffprobe asynchronously and store data in command

@param {FfmpegCommand} command
@private