I rechecked many times the videos and made many tests. My conclution is that the iPhone's Tello app uses iFrames on 9 seconds and I was using 1 or 5 seconds. So my problem was with the iFrames stutter. Is it possible to be higher then 10 ?The amount of data is not an issue. That is low for a recent phone. My s3 mini can do that easily.
Keep in mind that every iFrame causes a little stutter, so you want to avoid low iframe rates. Keep it at 5+ s if you can (if you have long-lived jitter on the screen you need to reduce it)