Well. Mjpeg is a nice variable frame size codec. Letting you go from 1k-13.3k in SD.
It is also a 4:4:4 codec when it is at 100% that is tprobably the biggeset thing you gain.
Problem will be this: it is a compressed codec so that means there is likelyhood of a lot of RT. Uncompressed actually gives you more RT because as you add to an uncompressed stream you are not asking the computer (or in some cases the card) to do all of the compressing on the fly. Some codecs (the DV codecs for example) are very good at this and their algorithms allow for multiple streams and they have been “optimized for video”. Many people would like to see this type of optimization with the M-Jpeg codecs because they are so flexible. This might also pave the way for some mixxed resolutions in the Timline. IE. a 1k, 5k, nd 13K Jpeg compression rates all playing back in one timeline.
That is some of it. I think it also carries an alpha channel. Graeme Nattress has many opinions on this, maybe he will find this thread.
No Alpha as far as I remember. Personally I like PhotoJPEG75% (Y’CbCr 4:2:2) and PhotoJPEG100% (RGB 4:4:4) as very lightly compressed codecs for both SD and HD. There’s no real time on them at all in FCP, but someone posted a hack on the decklink forum here at the cow to allow that.
One example is that MJPEG-A is a better codec than DV50; you can control the amount of compression there is with MJPEG-A while remaining in 4:2:2. This gives the user an incredible amount of possibilities when they want something better than DV50. I think this is a great move by AJA.