Portland, OR - Comcast - Page 164 - AVS Forum | Home Theater Discussions And Reviews
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Local HDTV Info and Reception > Portland, OR - Comcast
Keenan's Avatar Keenan 10:12 AM 02-21-2016
Quote:
Originally Posted by scowl View Post
A few of the sport channels are now MPEG4, like CBS Sports Network and the SEC Network. Others like Comcast Sport Network and Pac 12 Network are still MPEG2 for the moment. They're using about one third of the bitrate they were using before. Of course they look fine as far as I can tell.

They haven't switched over any of the 720p channels I watch.
One-third the bitrate and they look the same as before? That's rather remarkable.

scowl's Avatar scowl 11:34 AM 02-21-2016
Quote:
Originally Posted by Keenan View Post
One-third the bitrate and they look the same as before? That's rather remarkable.
MPEG4 is good at hiding faults. Also I'm watching basketball which is not good at showing compression problems. Maybe they waited until after football is over to start switching over to MPEG4.

I would say at this point that they look better. Some of the 1080i MPEG2 sports channels were on the edge of pixelization almost all the time. I'll keep watching to see if the motion looks blurry.
Keenan's Avatar Keenan 11:45 AM 02-21-2016
Quote:
Originally Posted by scowl View Post
MPEG4 is good at hiding faults. Also I'm watching basketball which is not good at showing compression problems. Maybe they waited until after football is over to start switching over to MPEG4.

I would say at this point that they look better. Some of the 1080i MPEG2 sports channels were on the edge of pixelization almost all the time. I'll keep watching to see if the motion looks blurry.
The SF bay area transition commences this coming Tuesday and hopefully, we'll see the same(or maybe better) as far as image quality. A poster in the Chicago thread has listed the MPEG4 channels matched to the frequency block/QAM they share and he's seeing as many as 10 MPEG4 HD channels per QAM.

Chicago thread post,
Spoiler!


Are you seeing similar channel groupings?
scowl's Avatar scowl 01:24 PM 02-21-2016
I don't have my cable hooked up to my PC so I don't know how channels are grouped.

One correction: the SEC ESPN Network is 720p and it appears to be the first 720p network to be switched to MPEG4. Its bit rate is 3.5 Mbps.

The MPEG2 720p sports channels still have a good bit rate, around 17 Mbps. So MPEG4 cuts the bit rate by over three fourths.
scowl's Avatar scowl 02:14 PM 02-21-2016
Quote:
Originally Posted by scowl View Post
One correction: the SEC ESPN Network is 720p and it appears to be the first 720p network to be switched to MPEG4. Its bit rate is 3.5 Mbps.
Uh, correction to my correction (ugh!). The first 720p channel to be switched to MPEG4 was FXX. Right now it has a problem of freezing for a few frames whenever there's a change of scene. It's hard to watch.
Dartman's Avatar Dartman 10:22 AM 02-27-2016
When I'm using video redo to edit my captures I can tell which ones are now MPEG 4 because I started using H264MKV container to save even more space and the MPEG2 stuff takes a long time to convert and the program says major recode required to warn you. The mpg4 stuff converts super quick and like Scowl said is usually averaging about 2meg a sec. Looks like all the channels you mentioned are set to 4 now, just doing a batch conversion now and see if anything new is low bitrate.
danbfree's Avatar danbfree 09:16 PM 04-13-2016
Any chance they just converted some channels very recently, like today? I'm noticing sports channels that used to appear pixelated actually look better now... Also my newer X1 box was really slow today when I got home from work and I had to reboot it.
scowl's Avatar scowl 09:22 PM 04-13-2016
The only sports channel I know is MPEG4 is CBS Sports Network.

Folks here can check if you give us a specific channel.
jtrain's Avatar jtrain 10:03 AM 08-05-2016
Quote:
Originally Posted by scowl View Post
The only sports channel I know is MPEG4 is CBS Sports Network.

Folks here can check if you give us a specific channel.
Anyone else w/ a TiVo (Roamio) and a Mini or two running into issues w/ the following channels (not buffering, no ability to rewind...720p H.264)?


Is Comcast down-resing 1080i channels? If so, is the channel provider confirmed to be okay w/ that?


709 - WGNAPHD - 720p (H.264)
715 - VICEPHD - 720p (H.264)
720 - Pac12 Network - 720p (no buffer, unable to rewind)
743 - BLOOMHD - 720p (no buffer, unable to rewind)
774 - NGWIHD - 720p (no buffer, unable to rewind)
793 - BBCA - 720p (no buffer, unable to rewind)
796 - DXDHDP - 720p (no buffer, unable to rewind)
797 - UPHD - 720p (no buffer, unable to rewind)
798 - AXSTV - 720p (no buffer, unable to rewind)
799 - NFLRDZ - (shows as 720p, but not currently subscribed)
801 - GALAPHD - 720p (no buffer, unable to rewind, H.264)
804 - OWNHD - 720p (no buffer, unable to rewind, H.264)
806 - SPMNHD - 720p (no buffer, unable to rewind, H.264)
807 - GSNPHD - 720p (no buffer, unable to rewind, H.264)
808 - POPNSHP - 720p (no buffer, unable to rewind, H.264)
809 - SMTHHD - 720p (no buffer, unable to rewind, H.264)


Recently discovered that a recording of Ripper Street was missed/not recorded (empty recording) of S4 E1 on BBCA 793. This is what tipped me off to something being messed up. I reached out to Comcast over chat, and had the cablecard re-provisioned, yet to no avail. VERY frustrating to be sure not to be able to record any of these channels on the TiVo, let alone watch on a Mini from another room (Mini freezes up and have to unplug the power to get it to reset). Any insight is appreciated. (Comcast, Beaverton, OR market, CableCard, TiVo Roamio Plus and two Minis)
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