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Originally Posted by Starburst Prison Break has had good comments on the quality of the HD feed however FOX's affiliates may be reducing the resolution/bitrate to allow them to merge news/weather etc and the caps you are watching may have been taken from those sources. |
This is less likely for Fox than for other networks, as they went HD (720p) far later than the other three (their initial DTV service was 16:9 480/60p for transmission with 480/60i production), and adopted a more "high-tech" (and lower cost) HD broadcast model for their local stations.
Fox distribute at emission rate, not distribution rate, and use their "splicer" technology to allow local bug insertion into the compressed stream (rather than requiring local decoding and recoding), so the network encodes at the rate the viewer sees, NOT the local station, in most cases. In fact the final emission rate is partially determined by the statmuxing between the East and West coast feeds I believe - as they share transponder space. To allow for some multi-casting, the emission rate is capped at a level that guarantees a fixed amount of freespace for other services. However the emission rate should only vary between East and West coasts, and not station to station AIUI.
This is in contrast with CBS, ABC and NBC who distribute a distribution rate feed that is permanently decoded at each local station, processed, and then re-encoded at a rate decided by the local station (allowing multi-casting of weather/news loops etc.)
AIUI Fox doesn't push the quality envelope in HD terms - so if the OP was viewing an off-air MPEG2 capture in 720/60p it may not be as good as a movie capture from a cable box or satellite via Firewire in 1080/60i (containing a 1080/24p transfer)
If the OP was watching a Divx or WMV conversion - then the source quality is less relevant still.