I've rendered a 2 min 36 second video to Sony HD 1920x1080 Intra 29.97 fps. The MXF file plays perfectly in VLC Media Player. I brought the file into Handbrake to render a 50 MB H264 MP4 file for a client's download site. The resultant file looks good but the audio plays at slightly less than double speed, then from the end of the audio at about 1 min 30 secs through the remaining visuals the last 10 seconds of the audio track plays over and over until the end of picture, still at nearly double speed. What am I doing wrong?