Mpeg is lossy. Can we work around this to allow a non-lossy image for graphics artists?You can set JPEG encoding to 100% quality and it isn't lossy. Can the same be done with MPEG* or Theora?
AFAIK if you do not zero the least-significant coefficients (after DCT) the JPEG or MPEG could be loseless. Maybe at mpeg you want to use only I frames, which effectively makes a MJPEG codec..
And if you do the previous, on the next-step (loseless compression - huffman encoding) produces larger output (because of high entropy).
Its questionable why to do it this way, the only reason I can imagine is that you want to decode such a stream by a off-the-shelf / proprietary decoder chip. But watch the bitrate capability of the chips.
If we make both encoder and decoder, I rather won't bother with DCT/IDCT, but directly encode the input or difference from previous frame (this is what vnc and all remote framebuffers do basically - including my idea/design of the Ethernet attached TFT screen).
Daniel _______________________________________________ Open-hardware-ethervideo mailing list [email protected] http://lists.duskglow.com/mailman/listinfo/open-hardware-ethervideo
