[maddy]

Originally Posted by Andyclockwise

How do you disable MHEG in WMC7?

Taken from here:

Sound disappearing on ABC1/NEWS24 - Australian Media Center Community

Simply delete these 2 reg keys and reboot to fix the issue:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\Media Center\Extensibility\Entry Points\{7e7a8710-9e4a-40a3-824a-7b0baf38abcf}]

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\Media Center\Extensibility\Applications\{a0cd8951-e5b6-4662-9c9c-d56c5b38ca59}]

[jon_c0]

Anyone else still experiencing this?

I have a new build A8-3870K and I'm using the APU HD6550 graphics with a TBS6280 DVB-T2 card and the latest AMD drivers and LAV filters. Mediaportal is my client app, with For The Record Argus as the TV server.

All HD channels from Freeview HD - BBC One HD, BBC HD, Channel 4HD and ITVHD - show very brief stutters/jerks at random intervals. Some times I can go 20-30 seconds without seeing anything, sometime I get 2 or 3 close together. If I toggle on (with Shift+1) the Mediaportal video diagnostic, the stutters correspond to a spike in the red graph level, but I can't pin it down to anything specific. Other than these random spikes, everything is fine.

I had assumed it was a quirk of my new system, but if others are seeing it...

[DVD-Man]

I'll post up my specs and software version when I get home.

[Bossworld]

Disabled MHEG and still get intermittent microstutter.

Watching that shared wtv file back, I seen one or two dropped frames on panning shots. I'm wondering if it's a graphics card issue or if I'm just hypersensitive to it.

Actually, I can replicate it every time on that video. Roughly 5:35 when it pans to Tony Hawks and she says 'tennis enthusiast... tony hawks'. Be interested to see if anyone else sees it. It is only on the HD channels, BBC Three is fine.

[ArmitageShanks]

Where can we find this shared WTV file? Curious to see if it's the same dropped frame/microstutter effect I'm seeing...

[Bossworld]

TBS 6280 pixellates, jumps, produces green blocks on Windows Media Center

I'd be very interested to see if you get the same jump at 5:35 that i mentioned.

[jon_c0]

I'll check out the the file later on and post-back.

However...watching the marathon on BBC One HD now, and everything is absolutely silky smooth - no issues at all. I've done a complete fresh install of everything (same spec as above) as what I had was just a "mess about" install to help me decide on how I wanted my new HTPC image. The only difference (other than loads of installed detritus not being present) is that I'm now running my main system, and so Mediaportal and the For the Record timeshift buffer, on a Corsair M4 SSD (main recordings till going to a traditional hard-disk) , but that of course, might not be related to the frequent little jerks I was seeing with DVB-T2 HD.

[Bossworld]

I've taken several images along the way of clean reimaging my system and I couldn't pinpoint anything in particular :/

Watched several sports and they were fine for the most part but I can see these small microstutters every now and again. It's nowhere near as it has been when I've previously had different incarnations of the Nvidia graphics drivers installed, but you can tell that something's not right (if you compare to BBC 1 SD)

I also experimented with disabling core parking but didn't make a difference.

[flashp]

I also got fed up with all this. I bought a Humax Freesat HD box in the end. Best thing I ever did. Still use the PC for MKV files.

[Bossworld]

Did you lads get chance to try that file?

[ArmitageShanks]

Originally Posted by Bossworld

Did you lads get chance to try that file?

I wasn't prepared to hand over my mobile number to a dodgy subscription service to get to the file.

[jon_c0]

Originally Posted by ArmitageShanks

I wasn't prepared to hand over my mobile number to a dodgy subscription service to get to the file.

You don't have to, although it is very misleading. Close that "window" top-right and you'll get to the proper download - it is a hefty file though, and at slow speeds for me...

I have it now so will report back...

[jon_c0]

Originally Posted by Bossworld

Did you lads get chance to try that file?

I have now .

Playing the file back using Windows Media Player on my HTPC system (I have Windows Center disabled as I use Mediaportal) and I see quite a few glitches/jerks around the Tony Hawks point with panning/movement.

However...all Freesat HD channels in Mediaportal, on the same system, seem to be fine for me now - no glitches at all. In Mediaportal I am using the LAV filters though.

[Bossworld]

Originally Posted by jon_c0

I have now .

Playing the file back using Windows Media Player on my HTPC system (I have Windows Center disabled as I use Mediaportal) and I see quite a few glitches/jerks around the Tony Hawks point with panning/movement.

However...all Freesat HD channels in Mediaportal, on the same system, seem to be fine for me now - no glitches at all. In Mediaportal I am using the LAV filters though.

Cheers not just me then. I've got LAV filters installed, I don't think they're triggered in live TV in WMC for what it's worth.

Any glitches/microstutters I do get are almost un-noticeable, however, they don't happen on Sky HD afaik.

[jon_c0]

Originally Posted by Bossworld

Cheers not just me then. I've got LAV filters installed, I don't think they're triggered in live TV in WMC for what it's worth.

The jerkyness that I see with WMP and that clip is massively noticeable - far more than I was noticing originally when I started adding to this thread - and it happens a lot in the bit of the clip I looked at. I'm suspecting that my setup isn't overly happy with Microsoft-supplied codecs in general, as when I used to use them in Mediaportal they were pretty awful too - pixellation and stutter. With the LAV filters though I seem to be fine on HD live/recorded DVB-T2/DVB-S2 (touch wood).

[ArmitageShanks]

I see two very very subtle jerks in the panning motion at the 5:35 point where Tony Hawks comes into shot. To be honest, I wouldn't have spotted that myself and would have put that down to dodgy camera movement.

FF'd to the F1 and cycle racing to see if there were any jerks there....and nothing noticeable either. Normally I see it in the F1 broadcasts when they use the tracking shots of the cars.

[STdrez625]

Have you tried recording with (all) antivirus turned off/ uninstalled? they try to do so much now with resident shield, safe links, safe web, identity theft etc.

irregular jerks on TV? No jokes??

[Bossworld]

I'll try lavfilters for live tv and recorded tv and report back.

The only time I had mega stutter was during Euro 2012, HD was practically unwatchable after an NVIDIA driver update.

I don't know if everyone else's definition of the microstutter is the same as that bit I've highlighted, I don't think it's panning as I can't really replicate anything similar on SD channels on similar footage, whereas an hour spent watching BBC HD or ITV hd reveals similar issues.

[DVD-Man]

I only use the CCCP driver pack on my machines, system details attached.

[jon_c0]

Originally Posted by Bossworld

I don't know if everyone else's definition of the microstutter is the same as that bit I've highlighted, I don't think it's panning as I can't really replicate anything similar on SD channels on similar footage, whereas an hour spent watching BBC HD or ITV hd reveals similar issues.

When I was seeing stutter, it didn't seem to be panning either. Rather it was certain sorts of movement, although I could never pin it down... Watching running around the track during the olympics it would stutter 2 or maybe three times a lap - a micro-stutter on runner movement. But then I'd also see a mini-stutter in some slower movement sometimes e.g. in an interview, when someone turned their heard or a person moved. Not all the time though, and most of the time similar sorts of movement would be fine, but it happened enough to be annoying. Don't see it now though (or, at least, I haven't for some time).

[Bossworld]

Originally Posted by jon_c0

When I was seeing stutter, it didn't seem to be panning either. Rather it was certain sorts of movement, although I could never pin it down... Watching running around the track during the olympics it would stutter 2 or maybe three times a lap - a micro-stutter on runner movement. But then I'd also see a mini-stutter in some slower movement sometimes e.g. in an interview, when someone turned their heard or a person moved. Not all the time though, and most of the time similar sorts of movement would be fine, but it happened enough to be annoying. Don't see it now though (or, at least, I haven't for some time).

Yeah that's exactly the kind of thing I was getting, perhaps some people notice it more than others (like on my car, I can hear if the heater fan starts chirping even over road noise and load music, and it drives me mad).

I'd have to spend some quality time watching Sky HD but I'm fairly sure it doesn't happen on there so I don't think it's a broadcast issue. Like you say it would perhaps be once or twice a lap.

I recorded about 7 mins of the Euro 2012 final and honestly through all my testing I must have watched the same bit 20 times to try and ascertain what was causing it. That it can happen be replicated on a consistent basis (as in that clip) maybe suggests it's perhaps if the bitrate increases or one frame needs more intensive deinterlacing? Either way, still no conclusive answer as to whether it's tuner hardware, 7MC or PC bits. All I know for sure is that it doesn't happen on SD TV.

[Bossworld]

Just to report back:

LAVFilters set to demux .wtv made no difference.

Using the XBOX 360 to watch that pre-recorded clip - no visible double stutter at the 5:35 point. I also can't see the stutter effect when playing back MOTD. Therefore I'm going to reasonably confidently state that there's no problem with the TV tuner hardware.

Two other things to note about XBOX 360 using 7MC extender:
1) There appears to be less overscan - on MOTD, there is more space around the score graphic than on a PC running 7MC.
2) There is something that almost looks like a constant wobble around the MOTD score graphic - I'm going to put this down to whatever's doing the deinterlacing for the XBOX not being as powerful as required (possibly my TV?).

I'm going to have to put it down to some kind of conflict in Windows 7 Media Centre or Windows Media Player (as it happens on both). I'll try Win 8 once released but not holding out much hope. At least it's only HD channels.

Jon, would you be able to share your settings for LAVFilters? In particular the video settings for deinterlacing (just a screenshot would be great).

[rat666]

Hi all. I've been suffering these jerks for a couple of months now, but only just found this thread. Thought i was the only one.

I've done everything imaginable to solve this. Recently got a new HD 7870, an upgrade from a HD4870, and still have the exact same issue. These 'jerks' always occur in the same place, and also happen on all 6 pc's and laptops i have tried them on, regardless of them having nvidia or AMD graphics.

They are either more frequent on live broadcasts, or just more noticeable, and occur on all HD channels. Old recordings are fine. I have a TBS 6280 dual tuner. Tried the TBS viewer. I get the jerks with the microsoft decoder, but not the power dvd decoder.

My LG plasma has no problem with HD, so it's not signal. If you screen shot the jerks, you will see that these frames are not being de-interlaced! Switch off de-interlacing, and all looks smooth again. My guess is that there are frames in the broadcast that have incorrect interlaced flags.

The graphics card reads these flags and is fast enough to dynamically switch de-interlacing on and off accordingly. The jerks are the card showing interlaced frames as progressive (maybe), messing up the frame rate. I have no idea how to check the flags.

As someone else mentioned, UK HD channels are now able to switch from interlaced to progressive on the fly, and so definitely have these flags. Maybe TV's don't suffer as they ignore the odd frame with incorrect flagging.

Finally, it may be coincidence, but this started just after installing an SSD drive,
off which i run windows and apps. I don't see how this would be a problem though.

I'll try re-encoding some stuttering recording to see if they disappear.

[Stiggy]

I have also recently noticed these stutters. My system is just W7 Media Center with tuners, no other odd software, and an ATI/AMD HD 5450 with my trusty 11.4 drivers. It was fine until a few weeks ago, so I guess something about the transmission via DVB-T2 has changed. I also record ITV 1HD via DVB-S2 and I will check if that is OK.

[ArmitageShanks]

The only thing I can think of that has changed in recent months is the resolution (1920x1080 rather than 1440x1080). My suspicion is that it's the dynamic interlaced/progressive switching that's causing the glitches. BBC HD trialled it first which messed up the sound and picture on a lot of Samsung and Sony TVs (which have all had updated firmware to correct their issues), but I suspect all the HD channels are now doing this?

Was watching the F1 this afernoon and the jerks are still very apparent and made more obvious by the panning motion.

I still contend it must be the native W7 codecs at fault here since we've got ATI and nVidia hardware and see the same problem. I'm running literally a clean W7 installation. No weird background services or virus checkers. The fact that the glitches are reproducible in the SAME places in the live buffer and recordings means it's highly unlikely to be a CPU/disc-hogging application at fault.

[Bossworld]

Originally Posted by ArmitageShanks

The only thing I can think of that has changed in recent months is the resolution (1920x1080 rather than 1440x1080). My suspicion is that it's the dynamic interlaced/progressive switching that's causing the glitches. BBC HD trialled it first which messed up the sound and picture on a lot of Samsung and Sony TVs (which have all had updated firmware to correct their issues), but I suspect all the HD channels are now doing this?

Was watching the F1 this afernoon and the jerks are still very apparent and made more obvious by the panning motion.

I still contend it must be the native W7 codecs at fault here since we've got ATI and nVidia hardware and see the same problem. I'm running literally a clean W7 installation. No weird background services or virus checkers. The fact that the glitches are reproducible in the SAME places in the live buffer and recordings means it's highly unlikely to be a CPU/disc-hogging application at fault.

That's why I harped on so much about that particular part in the linked video clip. I've still got odds and sodds of Euro 2012 recorded just so I could try and replicate if it was my hardware, software, codecs etc. causing the problem. I was going to buy an SSD and try Windows 8, but the SSD post a couple up has made me think twice.

I'm still fairly convinced the XBOX 360 doesn't exhibit the stutter, then again, perhaps it's not trying to do any proper native deinterlacing (as shown by the wavering score graphic)? Which with my limited knowledge of deinterlacing, sounds a reasonable explanation given the info above.

[Bossworld]

View topic - UK Freeview HD New Encoder ?

Think after enabling 411 + more info I've just seen it flicker very quickly from a fairly solid 50 to 25. Bugger, looks like there's the issue. Well done Armitage Shanks.

Whereas on CH4, the frame rate changes seem to be more pronounced. Need to do the anorak thing and sit there watching the content with the overlay and see if the jumps coincide.

On a side note, I have just (after 2 years of using Win 7) realised I've been watching a cropped picture. Changed the display panel type to television and I can now see more of the screen.

EDIT: http://support.microsoft.com/kb/2658140
http://experts.windows.com/w/experts_wiki/71.aspx

Looks as though it's not exactly a P1 bug. Going to start trying the solutions to the so called 29/59.

Final edit:

Tried the most recent Nvidia beta driver, don't think it's any better but here's a link if anyone else wants to try it out

http://www.thegreenbutton.tv/forums/...=1637&start=20

[ArmitageShanks]

Yeah, I tried looking at the 411 info a while ago, but couldn't see it changing. Will take another look

[rat666]

Originally Posted by Bossworld

On a side note, I have just (after 2 years of using Win 7) realised I've been watching a cropped picture. Changed the display panel type to television and I can now see more of the screen.

Yeah. i thought this was related to the stuttering, as i never remember media centre overscanning the picture before. Low and behold, unless you select television, media centre overscans. Needless to say, changing the display type has no effect on stutters.

(why there is still this insistance on overscanning I'll never know. It blurs the picture as it has to be resized, messing up the 1:1 pixel ratio [just scan]. This isn't analog television. we don't need/want overscan. sorry for the rant. ps. if you find that the media centre overlay now has a horrid border, put there to compensate for overscan, there are registry fixes for this. just google it.)

[Bossworld]

Originally Posted by rat666

Yeah. i thought this was related to the stuttering, as i never remember media centre overscanning the picture before. Low and behold, unless you select television, media centre overscans. Needless to say, changing the display type has no effect on stutters.

(why there is still this insistance on overscanning I'll never know. It blurs the picture as it has to be resized, messing up the 1:1 pixel ratio [just scan]. This isn't analog television. we don't need/want overscan. sorry for the rant. ps. if you find that the media centre overlay now has a horrid border, put there to compensate for overscan, there are registry fixes for this. just google it.)

Aye cheers, put them back where they should be via regedit

Does explain why the 360 as an extender always displayed more though (as it's expecting to be hooked up to a TV).

I can't say these latest drivers are definitely stutter free, but I'll do some more watching later.