Created attachment 360588 [details]
modified android tutorial 3 that shows the issue

On android if you have a pipeline like this:

videotestsrc ! glupload! glcolorconvert ! glvideoflip name=vflip ! glimagesink

you can set the pipeline to PLAYING->NULL->PLAYING with no issue until you change video-direction on video-flip.

After changing video-direction if you set the pipeline to NULL and then to PLAYING you'll get an error like this:

E/libEGL: eglCreateWindowSurface: native_window_api_connect (win=0xb39e1808) failed (0xffffffea) (already connected to another API?)

this seems some sort of clenaup issue.

I attach a modified tutorial 3:

1) when you click on pause button the pipeline will be setted to NULL and recreated
2) when you click on play button while the pipeline is already playing the video will be flipped.

Please follow these steps to reproduce the issue with the modified tutorial 3:

1) start the app and click PLAY, this should work
2) stop the video and start it again using the play button. No video flip was done, this should work
3) stop the video
4) start the video
5) click the play button again, the video direction will change
6) stop the video
7) try to start the video again, you should see the error