A buffer status metric representing a current amount of video packets in a video playback buffer (303) of a user device (300). A buffer status action is triggered based on the buffer status action and at least one of a mobility metric representing a mobility pattern of the user device (300) and a radio quality metric representing a signal strength of a radio channel carrying video packets towards the user device (300). The embodiments also relate to determination of a buffer control model (142) that can be used in order to control the video playback buffer based on the input metrics. The embodiments achieve a more efficient control of video playback buffers (303) and may reduce the risk of freezes during video playback.