To join the beta test:
Go to play store, open tellofpv paid app, then scroll down to the very bottom and you will see a button to join the beta test. If its not there then the test slots may be full.
Please let me know if this fixes your video corruption problem.
The beta was just released on play store but roll-out may take some time as always. It should show up in a few hours:
1.7.0
New
* Cinematic mode (extreme slow video mode, with smoothened yaw)
* Follow Terrain (
Tello keeps altitude relative to ground)
* Set Wifi name and password
* Manually request keyframe (tap bitrate or corruption indicator)
* Speed indictor also shows rate boost / limit by appending a B / L
Changed
* Menu structure
Fixed
* Corrupt videos on rare occasions
As always the manual is not yet updated so here a few notes:
Cinematic mode:
Similar to Tripod in DJI Go or CineSmooth in DJI Fly.
Extremely slow mode for smooth indoor footage, at full speed
Tello does under 2km/h or 1.5mph. Input is smoothened / filtered, so even if you go full yaw left
Tello will start to rotate slow and speed up. If you just let the stick go it will slowly stop, making a much smoother footage.
To enter Cinematic mode: When in Video mode long press the green "V" at the bottom left corner, it will become "C". You can't enter Cinematic mode directly from Sport mode (I am sure someone would manage to loose his
Tello).
To exit Cinematic, long press again to go to video, short press to go to Sport.
If Cinematic mode is too slow / fast you can use Rate boost / Rate Limit to cut the stick output in half, or double it.
Cinematic mode currently uses 40% rate at full pitch for example. If you press Rate Limit the output becomes 20%, with rate boost it becomes 80%.
I still need to play a bit with the speeds in this mode, maybe I will make it configurable.
Also I am still thinking how to make Rate limit / Rate boost accessible for users not using a controller.
Rate Limit / Boost indicator
The left bottom "V" / "S" / "C" will now be followed by a "L" or "B" to indicated rate boost or rate limit.
Follow Terrain:
There is a new button on the left side. You can activate it only when under 10m altitude, and
Tello will follow the terrain, that is it will follow the slope of a hill up and down, keeping the same distance from the ground. Of course if you fly over bushes, trees, tables, houses, etc it will follow whatever
Tello thinks is the ground.
You can still fly up & down as you like. If you stay below 10m
Tello will use the new altitude from ground. If you fly over 10m Terrain mode will switch off.
Set wifi and password:
Available from the menu. The new Xiaomi app requires you to set a password on the wifi you want to extend, so this was necessary to support users of the Xiaomi extender. Don't worry about me spying your wifi passwords. The chinese take care of that
Manually request key frame:
As explained a few times Iframes are requested to repair a broken video feed, but cause a blurring effect.
To get perfect video you want to avoid IFrames, so you set a very long Iframe period, or even completely disable periodic IFrame requests.
If a stream damage is detected a new IFrame is always requested, but if such damage goes unnoticed the resulting jitter / pixel garbage to stay on the screen for very long time (since periodic IFrames are deactivated).
'To clear this jitter you can manually request an IFrame by tapping on the bitrate / stream corruption indicator.
One more thing:
While testing of the cinematic mode I found something interesting, at least for my S7 with stock ROM (haven't tested on other devices):
It is important to activate the phone's flight mode and then only activate Wifi.
I know this has been said often also by myself, but more often then not I just deactivated mobile data (BT is always off for me) and though this would do the same thing, but still allow me to receive calls.
Its not the same. If the phone is not in flight mode some background process checks network connectivity and causes some minimal lag every few seconds. That background process is gone in flight mode with only Wifi on.