DrZarkov wrote:Unfortunally it is not suitable for a streaming video format, and even for download it is not simple enough. How about converting the videosignal to MPEG (not layer 3, but plain "MPEG 1".) like it is used on videoCDs? Did anybody tried other compression-methods like AAC+ or Ogg Vorbis?
No it wasn't intended as a streaming format as that requires that the same temporal quantity of video and audio arrive at the same time. This would require being able to specify the exact amount of compression be applied to match the video packets with the audio packets.
However it is still a valid technique for downloading and also storing in
low capacity storage areas. Although I suppose you could download them as compressed AVI's or WMV's or whatever and convert them to NBTV on demand.
No form of lossy audio compression will work *reliably* on NBTV because it throws away information that is not necessary for audio but may well be essential for video. You may get away with some material but sooner or later it won't work. The MPEG you see on video CDs is MPEG for video, and whilst it is lossy it is throwing away things that are not necessary for video rather than audio, and of course works on adjacent pixels in the video (and even pixels in other frames), these pixels are not adjacent in the NBTV wave file. When compressing video streams the video is always buffered into frames, processed, and then restreamed. BTW, the amount of compression that can be achieved with video is generally much higher than can be achieved with audio which is fortunate otherwise digital TV would not be as successful.
Of course a compression algorithm that knew about the NBTV wavefile could be written to compress it as video rather than audio. Nobody has bothered to write one yet though, I wonder why?