HighMAT is a standard that Panasonic and Microsoft developed to have multiple contents on one disc, easy accessible on different devices (PC, DVD Player etc.). See the offical HighMAT site for all the details. There are 3 kind of contents supported within HighMAT: audio (level 1), pictures (level 2) and video (level 3). Many Panasonic DVD players (so also the S49 and S295) are supporting HighMAT (level 2).
Please not that it seems like Highmat is not officially supported anymore. Almost no other manufactures supported this format and the official website isn't updated for almost 2 years now. However because these players support it it is nice to see in wich way we can still use it.
 
At the moment I am working at a complete revision of the HighMAT section. Check the frontpage for any updates on this section.
In the meantime some draft info:
Limitation of data format:
- WMA, MP3 (MPEG-1 Audio Layer 3) 64 kbps - 160.999 kbps, 44.1 KHz, stereo, fixed bit rate/ variable bit rate. - WMA, V2 and above, excluding Lossless/Voice/Pro - JPEG: Max 6M pixel, Maximum file size: 3 MB
Limitations regarding the number of files on the media, etc:
- Total number of audio files: Maximum 450
- Total number of still picture files: Maximum 999
- Total number of animation files: Maximum 200
- Total number of directories: Maximum 400
- Length of a file name: Maximum 108 characters (Unicode)
- Total number of play lists: Maximum 200
- Number of contents in the playlist: Maximum 900
Composition of HighMAT disc:
Menu: Classified for the navigation of the HighMAT digital contents. When menu selected, its submenu or the play list will be displayed. Play list: A list in which one or more digital contents are arranged in order Group: Sub-divided group of a play list
Digital Contents: Audio, still picture, and animation data.
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Panasonic
S42 / S52 / S49 / S295 Info Site 