Mark_Thompson wrote on Nov 18th, 2009, 8:43am:Okay I haven't been here for a while, but I remember this place and I have a question and that question is so better compression at the same or better quality is going to need better processing power in order to playback; that's why VCD didn't have that then even if one format is comparable to another there's still going to be pixellation until you get up to dual layer or HD format? So if your format is anything less than that then you'll lose something by way of digital artifacts if you convert it to a different format even if it's got better compression and is better quality? Even if one format's the same as another digital artifacts may appear in another area of picture owing to the different compressions adding more?
Hello again Mark, I'm not exactly sure what you are asking but I'll take a stab at answering.
Really high quality video playback does require better processing power to an extent, but really it depends on the actual software that is used for playback of the video file, some video software is very resource hungry whilst others are fairly 'light' on processing power. With the Dreamcast it all depends on three main things really:
1 - The Dreamcast itself.
2 - The capacity of a CDR.
3 - The limitations of the software.
HD and BluRay are currently setting the modern standards for visual entertainment, and there is no way in hell that the Dreamcast can compete with anything like that. At best the good old DC can be comparable to VHS, VCD, and near DVD quality for video playback. As for DC software there's quite a few video players available (but all have their own limitations).
All DCEvo releases (wether they are samplers or complete movies) are created for a 'balance' - that means they will play on a Dreamcast, the video sits in the 'safe zone' of the software limitations, and the CD size won't kill the bandwidth. Video playback on the Dreamcast can be better than anything we have released over here, but it takes trial and error to get the absolute best audio and visual data output from the DC without crashing the software that is available.
Modern codecs for video are producing really high quality output with relatively small file sizes, but we do not have the software for the Dreamcast to play those movie files (just imagine how good the quality would be with an MP4 player where you could just download the movie and burn straight to CDR without re-encoding).
The original source video file is important when creating any compressed video from it, you need the source file to have very good quality before you start. Any codec used after that will create some sort of artifact when compression is used, so the better the source to begin with, the less artifacts are present when the file is compressed to the format you want.
Hope that's answered your question Mark, if not, feel free to post back anytime.