Originally Posted by Brian Conrad
You must not own an HD-DVD player then.
Many of the recent HD-DVD disks are encoded with AVCHD so the players can decode them. It's just that for some reason many of the consumer level editing and authoring programs leave out that encoding for HD-DVD though they have it for BluRay. You have to go to pro level authoring before you get AVCHD on HD-DVD. And AVCHD is not a Sony proprietary codec.
Brian, I think you may be mistaken in thinking that some of the recent HDDVD disks are encoded with AVCHD, I know that they may be encoded with Mpeg4-AVC, from which AVCHD was designed. Sony created the AVCHD standard two years ago primarily for HD cam recordings. For detailed explanation of the AVCHD codec you can go here
Here is a quote from the passage:
"...HD DVD players were not capable of reproducing AVCHD content. While the players could be upgraded, Toshiba had never announced plans to support AVCHD playback. On the other hand, Blu-Ray players accept AVCHD video without re-encoding. Standalone Blu-Ray players may require creating proper directory structure, while Playstation 3 gaming console is able to play raw AVCHD video files, burned onto an inexpensive DVD blank disk."