hey. my application uses the following pipeline: filesrc ! decodebin ! appsink. filesrc is in version 1.10.3. decodebin and appsink are in version 1.8.3. since vaapi 1.10.2 vaapi delivers nv12 frames to me. previously, in 1.8.3, it's been i420. my application grabs theses frames from the pipeline and displays those via opengl. i know that both, my nv12 and i420 displaying, is correct. this problem only happens with vaapi installed. 

unfortunately i can't attach the file here as it's to big. but i think this is rather a problem of dimension than content.

container width: 496, height: 1026
stream    width: 490, height: 1000

the video_info object tells me that the video width is 490 and height is 1000. stride is 492. anyway, when i look into the actual buffer it feels more like the width is 496 and the stride is 512. means the data from 0 to 495 is more or less continous while from 496 to 511 its zero. this leads do a distorted displaying of the video.

gst-launch-1.0 is able to play the video without any distortion. so i guess there is a workaround for that.