Unable to start Tello video on ubuntu 16.04

[rlanari]

Hi, I'm trying to run your example (go run tello_video.go): all seems to work (tello connection is ok.. the last message displayed is "connected"), but mplayer does not displays any video. The command is correctly run (ps -ef | grep mplayer --> i find it as a running process with -fps 25 -)... but nothing is displayed. DO you have any suggestiong about it ? Many thanks in advance and congratulation for your hard work !!!

[deadprogram]

Hi @rlanari does the player window open, but no video in it?

I don;t think you should find the mplayer process running separately from the go process when the go code is not running. Perhaps you need to kill a stray mplayer process?

[rlanari]

I checked it but before running go process I didn't find any mplayer process: I saw mplayer process only after typing the command: go run tello_video.go I have this OS: DISTRIB_ID=Ubuntu DISTRIB_RELEASE=16.04 DISTRIB_CODENAME=xenial DISTRIB_DESCRIPTION="Ubuntu 16.04.4 LTS"

What OS are you using ? Is there some particulare mplayer plugin that should be installed ?

[deadprogram]

I am using same Ubuntu as you, and I installed from package manager. So nothing very interesting.

What output do you get when you run mplayer -h?

[deadprogram]

Also, what version of Go?

[rlanari]

mplayer -h Usage: mplayer [options] [url|path/]filename

Basic options: (complete list in the man page) -vo select video output driver ('-vo help' for a list) -ao select audio output driver ('-ao help' for a list) vcd:// play (S)VCD (Super Video CD) track (raw device, no mount) dvd:// play DVD title from device instead of plain file -alang/-slang select DVD audio/subtitle language (by 2-char country code) -ss seek to given (seconds or hh:mm:ss) position -nosound do not play sound -fs fullscreen playback (or -vm, -zoom, details in the man page) -x -y set display resolution (for use with -vm or -zoom) -sub specify subtitle file to use (also see -subfps, -subdelay) -playlist specify playlist file -vid x -aid y select video (x) and audio (y) stream to play -fps x -srate y change video (x fps) and audio (y Hz) rate -pp enable postprocessing filter (details in the man page) -framedrop enable frame dropping (for slow machines)

Basic keys: (complete list in the man page, also check input.conf) <- or -> seek backward/forward 10 seconds down or up seek backward/forward 1 minute pgdown or pgup seek backward/forward 10 minutes < or > step backward/forward in playlist p or SPACE pause movie (press any key to continue) q or ESC stop playing and quit program

• or - adjust audio delay by +/- 0.1 second o cycle OSD mode: none / seekbar / seekbar + timer

• or / increase or decrease PCM volume x or z adjust subtitle delay by +/- 0.1 second r or t adjust subtitle position up/down, also see -vf expand

• • • SEE THE MAN PAGE FOR DETAILS, FURTHER (ADVANCED) OPTIONS AND KEYS * * *

MPlayer 1.2.1 (Debian), built with gcc-5.3.1 (C) 2000-2016 MPlayer Team

[rlanari]

go version go version go1.10.2 linux/amd64

[deadprogram]

You are using pretty much the exact same versions of everything as I am.

OK one thought is are you already using port 6038 for something else? I have intentions to allow changing the port used for the video when received, but still have not implemented that: https://github.com/hybridgroup/gobot/blob/master/platforms/dji/tello/driver.go#L248

[jakes-git]

Hi @rlanari, I'm having the same issue. Have you found a fix?

[NikolaeVarius]

I can't run this with arch either. The tello works fine but no video window opens

[sebsto]

I had a similar issue on MacOSX and found out that my company IT enforced a firewall rule on our laptops preventing to accept UDP packets. Disabling the firewall solved the problem.

On Mac : type sudo pfctl -d