All of the above have both positive and negative aspects, and none of them have really taken off enough to be considered a mainstream success, at least in the context of advanced content delivery. Cost and complexity are probably the biggest hurdles to wide acceptance for all of them, but we are seeing some interesting moves to increase attractiveness to consumers.
Richard Lawler on EngadgetHD has reported that JVC’s US Blu-Ray player debut will be the first such device to playback Matroska (.mkv) files. The move to support codecs and file formats beyond those required for the official player specifications developed on standard definition DVD players in 2003 and then really took off with the growth of DivX certification thereafter. Clearly JVC is trying to differentiate themselves from their Blu-Ray player competitors by appealing to a subset of consumers that are downloading Blu-Ray rips but would like to watch them on devices other than their PC’s. Also interesting is that JVC is not working with DivX to do this, in fact they explicitly say “DivX files” are incompatible. These moves by JVC is interesting for a few reasons.