var config = {
  // Replace with your own bucket information
  Bucket: 'examplebucket-1250000000', /* Bucket (required) */
  Region: 'COS_REGION', /* Bucket region (required) */
};
cos.request({
    Bucket: config.Bucket,
    Region: config.Region,
    Method: 'GET',
    Key: 'test.mp4',  /* Media file in bucket (required) */
    Query: {
        'ci-process': 'snapshot', /** Fixed value (required) */
        time: 1, /** Screenshot time point in seconds (required) */
        // width: 0, /** Screenshot width (optional) */
        // height: 0, /** Screenshot height (optional) */
        // format: 'jpg', /** Screenshot format (optional). Valid values: jpg; png. Default value: jpg */
        // rotate: 'auto', /** Image rotation method (optional). Default value: auto */
        // mode: 'exactframe', /** Frame capturing method (optional). Default value: exactframe */
    },
    RawBody: true,
},
function(err, data){
    console.log(err || data);
});

function(err, data) { ... }