There is a bug in the muxing under MTS in PRE13. Using the MTS-H264 1080i preset the resulting movie has jittery video and/or audio. However if the movie is rendered into separate audio and video streams by turning off multiplexing, the separate streams are fine. Furthermore if these streams are then entered into a new PRE13 project for muxing the problems recur whereas if they are muxed in PRE10 the result is fine. PRE13 therefore introduces a problem into the muxing process. Is there any chance you can release a patch to fix this?