Comment Re:Fix HD First (Score 5, Informative) 559
MPEG-2 is compressed by definition; an uncompressed HD picture is something like 1 Gbps. Confetti, for example, looks awful no matter what the source, because it's hard to compress.
The only reason MPEG-4 isn't supported in ATSC is because it didn't exist when the standard was written! MPEG-4 is actually now in ATSC, but is not a required part, so no receivers support it and no broadcasters use it except in rare corner cases.
And it's only 18.2 Mbps if there are no other services on the OTA channel; some stations in smaller markets now cram 3 HD services into the 19.393 Mbps channel, which is an average of about 6 Mbps per video channel when you take into account audio and overhead. Most other stations run at least one SD channel in addition to the HD channel, many run more than one. Others are doing Mobile DTV which eats into the bandwidth available. The bitrate of a single HD feed averaged across all OTA stations in the US and Canada is something in the neighborhood of 13 Mbps in MPEG-2.
Obligatory disclaimer: I used to work for a broadcast TV company heading up our broadcast TV engineering projects. I now work for the FCC on over-the-air digital TV matters. In my spare time, I run digital TV website RabbitEars.Info.