.ts file sizes larger than in 1.3.11?

[ilovejedd]

Fox, at least here, is 720p. I know there is at least one network, and maybe it's NBC, that does 1080i or p.

I don't think there's any broadcast network that does 1080p. NBC is 1080i (at least in Los Angeles).

[ilovejedd]

I do recall awhile back when I was first playing with GB-PVR on a test box, I recorded a 3 hour movie on one of the local 1080i channels, and it came in at over 9GB per hour. I've not seen such high bitrates lately though. I think that particular channel (KTLADT) probably dialed back their bitrate to something more reasonable to make room to carry ThisTV-SD on a sub-channel.

Interesting. I've seen file sizes like that for KNBC but never from KTLA. Max I've ever gotten from KTLA is 8GB.

[mvallevand]

Based on what I've seen on EngadgetHD Fox and ABC are usually 720p and CW, NBC and CBS are 1080i. You have to be careful about the bandwidth though since the true ATSC size might even be compressed by the cable provider. I've read horror stories where some 20Mb streams are cut to 6MBs

SD digital here is quite low bandwidth on QAM about 2.1 Mb, oddly they look better than my 8 Mb analog captures.

Martin

[ilovejedd]

Based on what I've seen on EngadgetHD Fox and ABC are usually 720p and CW, NBC and CBS are 1080i. You have to be careful about the bandwidth though since the true ATSC size might even be compressed by the cable provider. I've read horror stories where some 20Mb streams are cut to 6MBs

Geh... What are you paying for? Seeing colorful moving squares?

SD digital here is quite low bandwidth on QAM about 2.1 Mb, oddly they look better than my 8 Mb analog captures.

They get better sources. We, however, not only have to deal with analog noise, we also have to deal with MPEG2 encoding artifacts and not so good NTSC tuners for the PC.

[johnsonx42]

I don't think there's any broadcast network that does 1080p. NBC is 1080i (at least in Los Angeles).

I've seen 1080p on NBC for sure, and I think CBS too. Wikipedia's MPEG-2 article has a nice explanation:

Also note that the ATSC specification and MPEG-2 allow the use of progressive frames, even within an interlaced video sequence. For example, NBC stations transmit a 1080i60 video sequence – meaning the formal output of the MPEG-2 decoding process is sixty 540-line fields per second. But for prime-time television shows, those 60 fields can be coded with 24 progressive frames. Some NBC stations do this, meaning they actually transmit an 1080p24 video stream (a sequence of 24 progressive frames per second) with metadata instructing the decoder to interlace them (and repeat them in 3:2 pulldown) before display.

Thus, it would be incorrect to say that the ATSC standard doesn't contain 1080p video, or that broadcast HDTV doesn't use 1080p video. The ATSC specification allows 1080p30 and 1080p24 sequences – just not 1080p60 sequences. They aren't used in practice, because broadcasters want to be able to switch between 60 Hz (news, soap operas) and 24 Hz (prime-time) content without ending the MPEG-2 sequence. However, the ATSC specification also allows broadcasters to transmit progressive frames within an interlaced sequence, and some broadcasters actually do this in practice. Their transmissions could fairly be described as 1080p24, since they contain 24 progressively-coded frames per second. (This is the same mechanism used by HD-DVD to code 1080p24 content – progressive frames within an interlaced sequence.)