Qt6.5.2 QMediaPlayer play video an error on android 11

1: i was complie the player example for android 11, when i use ffmpeg as backend for qmediaplayer, and it play the first video is correct, but when i  play next video, there was a output the audio but not the video, and it ouput the error:

"Cannot create codec,Failed to open FFmpeg codec context Generic error in an external library 

and any video play can't output any video on qvideowidget.