But yes, it is possible that when down-converting your bitrate when done as part of burning process that some jitter crept in. AVCHD is a very demanding format, and though your computer is more than capable of handling it, IMHO I think it still requires some care. That is why some of us here prefer to take things one step at a time -- edit, produce new video of project, then burn that new video; rather than editing and then jumping straight to burn and leaving that complicated conversion process take place as part of what is already a complicated burning process.
I might add here, on a personal note, that like Trevor, I used to produce AVCHD hybrid discs and was very satisfied with their quality. And I could play them on my PlayStation 3 which is an excellent Blu-Ray player apart from anything else it does. The PSP is connected via HDMI to my 46 inch HDTV. I then moved on to Blu-Ray discs, but these days I largely don't produce either type of disc. I prefer to simply produce my edited videos into their final form as either AVCHD 2.0, mp4 with bitrates above 28 Mbps or Blu-Ray mpeg-2 files, also with higher bitrates. Then I simply transfer them either to the PSP hard disk, or more usually an external USB hard disk or, less usually, a large capacity USB stick drive and connect these to my PSP. You may also be aware that many HDTVs more up to date than mine can play such videos direct from external drives or USB stick drives plugged directly into the HDTV; not to mention those HDTVs that can have streaming video played direct from the home network.
Mind you, you still probably need discs for distribution to family and friends -- though for AVCHD/Blu-Ray discs, your family and friends themselves have to have Blu-Ray players. But these days, with the cost of USB stick drives plummeting, it is more and more feasible to give friends and family your masterpieces on such a drive. And you will notice that X7 can even burn to SD cards...!
