QML Video player is very unstable with RTSP streams

We have faced difficulties with using of VideoPlayer control from QtMobility library.

(In QML it's Video from QtMultimediaKit 1.1 or QVideoWidget/QMediaPlayer from qmediaplayer.h in case of ordinary Qt).

1. It works very unstable in case of occurring with even small network latencies. Even when we use very good WiFi network connection. Often we got the message "The application not responding" when the player try to play (or reload) the stream. Sometimes this message was closed after five-ten seconds.
2. When we try to play a stream "rtsp://plb.sg.softspb.com/0987-6543-2109/68_350.sdp" it's shown the message 'handle_hdcodec_error: unsupported stream or invalid i/p params
' but other players (on desktop, android or GStreamer on N900/Maemo) works well with it. This stream doesn't work in standard N9 player too.