DrWho said:
Direct has bit rates that hover around 17mb from the lists I have seen.
Not sure what the bit rates for Voom are.
It's actually very difficult to come to a bitrate comparison between Voom and DirecTV, because we have no way to extract video from Voom's service to find out now much
net bitrate is allocated to the content. Some of the data available to the satellite providers is used for overhead, things like error correction, guide data, etc. We know how much GROSS bandwidth Voom has, and we know how much gross bandwidth DirecTV has. Because we can extract video from HD-TiVos (well, we're not supposed to, but it CANn be done for those who put the effort into it), we can also find out how much NET bandwidth actually goes towards encoding the programming. If we compare gross to gross, DirecTV is around 17.2Mbps for all the HD channels that are two/transponder, and 11.4Mbps for the HD channels that are three/transponder. Based on the charts at the bottom of
this page, it's still just the three movie channels, even on Sundays during the games. During the week, many HD channels have an entire transponder to themselves, or 34Mbps (which isn't really used fully, as that's more bandwidth than the networks send it at to DirecTV).
Doing the same math for Voom, based on the total bandwidth they have available, if we assume 2.5Mbps for SD channels, at roughly 90 channels, that leaves 490Mbps for 37 HD channels, or 13.2Mbps average. They do have an advantage though, in that they have many in-house movie channels, that can probably be pre-encoded at a lower bitrate, therefore raising the average for the other channels. I'm taking these numbers from an earlier calculation I did for
this post, there may be a little more info there.
As far as Dish, I believe most of their HD channels are now three/transponder, but Dish gets more bandwidth out of each transponder because of the modulation they are using. In the end, I think their bitrate numbers are pretty close to DirecTV. Voom also uses newer modulation, and gets even more bandwidth per transponder than Dish. But Voom doesn't have anywhere near as many transponders as Dish or DirecTV, so their total bandwidth is still much less.
If Voom can get MPEG4 and/or WM9 going, and/or get content shifted over to the other satellite they have leased space on, they will be in much better shape from a bandwidth perspective. And DirecTV will have much more bandwidth with all the satellites they have launching over the next couple of years. And I'm sure Dish is doing something to, it just hasn't been talked about as much.