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Discussion Starter #1
I have an ongoing problem that has been present though most of the hockey playoffs. While watching ota in Toronto on a Samsung LCD the game live is fine but as soon as it goes to commercial they studder and stop. Back to the live game and everything is fine. It also happens on replays although not as much. This doesn't seem to happen on my Sony set and doesn't happen on either set if I watch the game on Bell Tv. Anybody experiencing the same thing and if so what could be causing it? This only started in the playoffs. I haven't watched anything else on CBC so I don't know if it happens on other shows or not.
 

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I've experienced exactly the same thing. Live action seems fine but everything else (commercials, replays, etc.) stutters. This began somewhere around the 2nd round of the playoffs, prior to that no problems. I figured CBC must have changed something technically that my tuner couldn't handle as it's fairly old (4th generation). But now that others seem to be having the same problem with likely newer equipment maybe there is something more to this.
 

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Yeah, it sounds like it's affecting some tuners and not others. My 47" Vizio TV has a pixellation problem, but my Dynex TV up in my bedroom, which is at least 5 years old, does not, and neither does my 750Q tuner card. I have no idea what causes it. It started right around playoff time.
 

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I've been noticing this issue during the CBC Kids shows in the morning. The video pixelates and stutters but the audio never drops. I thought it was some tropo or signal issues, but it is happening almost every day.

I tuned into the hockey game tonight to see if I could see what others were reporting. Sure enough, the live game is mostly fine, some of the replays stutter and pixelate as do some of the commercials. This is on an older 32" Samsung. I will have to check on my other TV's and try with my HD Homerun.

I don't recall exactly when this started, but it has been a while now.
 

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NHL on CBC-CBLT

It seems it's every 10 seconds on or so that the picture stutters on CBLT- not good for viewing.

I'll be switching to NBC when games are carried even though the play-by-play announcer is a little over-the-top.
 

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I checked again this morning with Animal Mechanicals which always has this problem. It seems that of my actual TV's, I only have the issue on my Samsung LN32A450 which is the oldest set. My Samsung LN46D460 and LG 26LV2500 are completely fine. I'm going to record for a while with my HD HomeRun with MythTV and see what happens.
 

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Discussion Starter #7
Interestingly the Samsung I alluded to in my previous post is also a LN32A450. My Sony is about 1 year newer. Maybe if Marc is reading this he could shed some light on things.
 

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Interestingly the Samsung I alluded to in my previous post is also a LN32A450. My Sony is about 1 year newer. Maybe if Marc is reading this he could shed some light on things.
I'm reading, but I have no light to shed.

At home, I'm on cable. I can switch to OTA when necessary but it's not my first choice.

At work I've had OTA on all day yesterday and so far today. It has been solid with a rooftop antenna.
I came across one TV in the building was blocky, but repositioning the set top antenna fixed that.
I discussed this thread with one of our transmitter gurus yesterday. We couldn't come up with a theory that fits the symptoms described here.
 

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I noticed this phenomenon last night during George Stroumboulopoulos. There was a segment where Sean Cullen was talking about history. Whenever the picture was on Sean Cullen's face the picture was flickering and pixellating. But whenever the picture went to the historical images the reception was fine.

Also noteworthy is that the sound was not affected. I could hear Sean Cullen's speaking just fine even when the picture was acting up.

I was watching on a 32' Dynex LCD that is about two-years old.

Marc, please keep on thinking this through. I may have seen this before but I may have thought it was overload. Last night was the first time I spotted the pattern of only some pictures fluttering and others working just fine. And the sound being fine the whole time. It definitely wasn't overload.

I have a second antenna on my roof. An unamplified ClearStream2v. I'll hook it up to a single TV, record my observations and report back.
 

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The symptoms of HWP's experience replicate mine exactly during the hockey games. Some commercials pixellate pretty badly, as does the HNIC intro theme video at the top of the hour. I didn't watch George Strombohoweveryouspellit's show.

I did notice two weekends ago, when CBC was playing a movie (Million Dollar Baby, I think) late on Saturday night, the pixellation was unbearable to watch, but there was absolutely nothing wrong with the audio. I went upstairs to my Dynex, which is about 4 or 5 years old, and there was not a problem with picture or sound.

Again, when I plug the cable into my 950Q tuner (using the same cable as my TV with the pixellation issues), the picture and audio are just fine as well. I'm tempted just to plug an HDMI cable into my TV and project it that way.
 

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I switched the same Dynex TV to the unamplified cs2v antenna without any splits.

I put on the six oclock news.

The same flickering ocurred during the 5:45 commercial break for the Casino Rama ad and the Amex ad, but not the Nova Scotia and Luminato ad. And at 5:55 on the nuttella ad.

The news itself was fine for the few minutes I watched it.
 

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I would tend to agree with tvlurker and it sounds like the mpeg decoder doesn't like the way they are encoded. Why it affects commercials primarily is a mystery though. Could it somehow be related to programming that isn't live?
 

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Discussion Starter #14
Unwatchable tonight. Tried to watch Doc Zone. Stuttering and breaking up every few seconds. Hopefully we can resolve this problem. Everything was fine until a month ago. Something has changed. Not an antenna issue as this is, and has always been, my strongest signal at 100% on strength meter.
 

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The stuttering problem has been constant on every program I have checked out on CBC since last night. Usually only on ads and also on "transition graphics" within a show. For example on the Six O'Clock News, there is a graphic used as they go from ads back to the anchors...it is a stylized "TORONTO." That image is also subject to the stuttering. When I woke-up this morning, it was still happening on the Morning News.

It is distracting and bothersome.

This problem is only on the CBC channel. I don't have any of this type of flickering on any of my other channels.
 

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TSReader Details

I went through all of my channels this morning and compiled a list of the "descriptors" for the HD video portion of the streams. The only 720p channels I receive are CBC and SRC, all of the others are 1080i. There are a number of extra flags being picked up for CBC that aren't there for other channels. I have no idea if any of those would cause the issue.

CBC:

Elementary Stream PID 49 (0x0031) MPEG-2 Video
MPEG Video: Bitrate 15.000 Mbps Resolution 1280 x 720p
MPEG Video: Framerate 59.94 fps Aspect Ratio 16:9 Chroma Format 4:2:0
Descriptor: Video Stream Descriptor
Multiple frame rate flag: False
Frame rate: 59.94¼
MPEG-1 only flag: False
Constrained paramter flag: True
Still picture flag: False

SRC:

Elementary Stream PID 49 (0x0031) MPEG-2 Video
MPEG Video: Bitrate 14.000 Mbps Resolution 1280 x 720p
MPEG Video: Framerate 59.94 fps Aspect Ratio 16:9 Chroma Format 4:2:0
Descriptor: Data Stream Alignment Descriptor
Alignment type: video access unit
 

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I would tend to agree with tvlurker and it sounds like the mpeg decoder doesn't like the way they are encoded. Why it affects commercials primarily is a mystery though. Could it somehow be related to programming that isn't live?
FYI
Many BDUs are using the same MPEG2 encoded signal without complaint.
 

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I'm glad I read about these issues with CBC occurring on some tuners and not others.

I picked up a Hauppauge WinTV aero-m a while back, and it's an awesome little USB tuner. Unfortunately it malfunctioned somehow and I had to send it back to Hauppauge for service. When it came back, I re-installed it and assumed everything was OK until I was watching CBC one night, and I noticed all the stuttering. Being lazy, I figured the repairs left me with a tuner which wasn't as good as the one I sent in originally, but thanks to this thread, I can see I'm going to have to do a little more checking!
 

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FYI
Many BDUs are using the same MPEG2 encoded signal without complaint.
Since the issue seems to only occurre on sme tvs, it is quite possible that their mpeg decoders don't exhibit this problem.

Has anyone outside of the Toronto area seen this issue? If not it sounds like a local issue and should be moved to the local thread.
 

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Has anyone outside of the Toronto area seen this issue? If not it sounds like a local issue and should be moved to the local thread.
If by "this issue" you are referring to the "stuttering", and if you consider Kitchener far enough outside of Toronto, then yes. I do receive the signal from Toronto, so if that makes it a local issue I can follow along there.
 
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