Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




61 posts

Master Geek


Topic # 25238 15-Aug-2008 23:44
Send private message

I've been watching some of the Olympics in HD with a G7503-DSE and have been noticing picture glitches in some of the sports, where the picture will freeze for about 1-2 seconds before continuing (audio is unaffected).

The weird thing is that it doesn't seem to be completely random, basically it only happens in fast moving sports that have a lot of camera angle changes.  I was just watching some track cycling just before and it happened quite a lot, and always just before the picture was about to change from focusing on a close-up of 1 rider to a wider shot.

I also have a PC with a HVR2200, and it's perfectly fine so I guess I'll be getting the G7503 replaced.  Before I do I thought I'd see if anyone had heard about this problem (mainly so I can tell DSE that it's a known issue Wink).  Also I would be interested generally if anyone knows what may be going on here, as it's definitely not a random thing (and has never happened on a non-HD signal).

Cheers.

Create new topic
25825 posts

Uber Geek
+1 received by user: 5553

Moderator
Trusted
Biddle Corp
Lifetime subscriber

  Reply # 157347 16-Aug-2008 07:01
Send private message

If you're not getting the same results on the PC then chances are it could be the STB - the quality of the Zinwell boxes in general is only pretty average.

As for picture breakup there has been a lot in outside events (particularly the cycling) where the microwave uplink has been lost between the ground and presumably the helicopter above that's relaying the picture.

Minimalist
5410 posts

Uber Geek
+1 received by user: 379

Moderator
Trusted
Lifetime subscriber

  Reply # 157352 16-Aug-2008 09:08
Send private message

I've noticed it too on many different sports, and yes before/as the shot changes.

 
 
 
 


80 posts

Master Geek


  Reply # 157471 16-Aug-2008 22:58
Send private message

I've also noticed these freezes with our G7503. They tend to happen before a scene/shot change - which I guess is because a whole new keyframe (and a lot of data) is needed. I'm not sure if its exacerbated by poor reception, or just a function of the extra processing it takes for a new scene to be displayed.

I've only seen it on the Olympics, and initially I thought it might be NZ's or Olympic signal rather than just mine. But it does sound like a set-top box problem if your other one is fine.

1078 posts

Uber Geek
+1 received by user: 176


  Reply # 157493 17-Aug-2008 11:09
Send private message

HVR2200, I've noticed it too, but ONLY on camera change I guess it's at their end.




138 posts

Master Geek


  Reply # 157507 17-Aug-2008 12:39
Send private message

I've had freezing and blocking with a Nova T 500 and Mediaportal, although I supect some of it is my box. It does seem to mostly be a feed issue, as said before particularily with the moving (and hence wireless) cameras.
The tech to wirelessly transmit HD must be pretty new, and it is a large data stream to deal with.

1078 posts

Uber Geek
+1 received by user: 176


  Reply # 157549 17-Aug-2008 18:18
Send private message

I'm not talking about blocking or corruption, just a freeze for a second as the camera changes, I really saw this on the out cycling races.




1772 posts

Uber Geek
+1 received by user: 328

Subscriber

  Reply # 157601 17-Aug-2008 22:09
Send private message

I have had these mini freezes on the DSE Freeview box and the SKY box. As others have said, it seems to happen on camera changes. Don't really think we can use these as an argument to take the box back!



61 posts

Master Geek


  Reply # 157606 17-Aug-2008 22:28
Send private message

Oh well at least it's a common problem, I guess that's kind of good from a selfish perspective.  I have a knack of getting imperfect equipment (e.g. I have never owned an LCD display without a dead pixel!) so I didn't want to sell myself short on this one.  Won't bother trying to replace it then.

42 posts

Geek


  Reply # 157682 18-Aug-2008 11:49
Send private message

Host Broadcaster End nothing to do with Freeview or the zinwell box. Low shot (side) on rowing and Track cycling side camera are especially bad.

HD wirless links I susspect....

133 posts

Master Geek
+1 received by user: 6


  Reply # 157765 18-Aug-2008 16:15
Send private message

linw: I have had these mini freezes on the DSE Freeview box and the SKY box. As others have said, it seems to happen on camera changes. Don't really think we can use these as an argument to take the box back!


I believe it's actually the other way round... when the operator at either TVNZ or Beijing notices there is a freeze on the image (probbably casued by the interupt in signal transmission), he just immediately swtich the camera to another one.


i notice this "glitching" problem on HD freeview, Satelite Freeview and analogue TV one broadcast. it happens most often during outdoor events

8 posts

Wannabe Geek


  Reply # 157781 18-Aug-2008 17:00
Send private message

I'm seeing this too on my Zinwell (DSE) box. At first I just assumed it was some issue with the feed coming into TVNZ from Bejing but then I looked closely at the picture when it froze: the MPEG artifacts around the TV One logo like the mosquito noise and blockyness were still there in the freezed frame.

Presumably if this was an issue with the feed these artifacts wouldn't be there when the picture was paused (since it would essentially be a still picture to the encoder -> high encoding quality). Maybe it is something going on in the Zinwell box? Or are TVNZ just using crude methods to switch between shots (perhaps due to them not being fully equipped for HD broadcasting yet) which cause the decoder to slip up?

42 posts

Geek


  Reply # 157807 18-Aug-2008 20:07
Send private message

Guys as long as you are only talking only about the Olympic coverage especially the cycle track coverage, I can assure you it is the Host broadcaster and the OB truck end with possibly some wireless breakup and not the zinwell box or NZ TX via Freeview.



61 posts

Master Geek


  Reply # 158187 19-Aug-2008 23:12
Send private message

whatty: Guys as long as you are only talking only about the Olympic coverage especially the cycle track coverage, I can assure you it is the Host broadcaster and the OB truck end with possibly some wireless breakup and not the zinwell box or NZ TX via Freeview.


Well like I said I ran a side by side test with the DSE/Zinwell and an HVR2200 and only the DSE glitched.  But yeah, have never seen it glitch in ads or non-Olympic coverage so who knows?

20576 posts

Uber Geek
+1 received by user: 3961

Trusted
Subscriber

  Reply # 158190 19-Aug-2008 23:34
Send private message

Are you people with the issues outputting at 720p or having the box downconvert to 1080i only to have your screen deinterlace it again?




Richard rich.ms

8 posts

Wannabe Geek


  Reply # 158195 19-Aug-2008 23:56
Send private message

I noticed that it does it on the HD Demo channel too on part of the Poseidon clip with lots of flashing light (the disco scene).

Create new topic



Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

New Zealand hits peak broadband data
Posted 18-Jan-2018 12:21


Amazon Echo devices coming to New Zealand early February 2018
Posted 18-Jan-2018 10:53


$3.74 million for new electric vehicles in New Zealand
Posted 17-Jan-2018 11:27


Nova 2i: Value, not excitement from Huawei
Posted 17-Jan-2018 09:02


Less news in Facebook News Feed revamp
Posted 15-Jan-2018 13:15


Australian Government contract awarded to Datacom Connect
Posted 11-Jan-2018 08:37


Why New Zealand needs a chief technology officer
Posted 6-Jan-2018 13:59


Amazon release Silk Browser and Firefox for Fire TV
Posted 21-Dec-2017 13:42


New Chief Technology Officer role created
Posted 19-Dec-2017 22:18


All I want for Christmas is a new EV
Posted 19-Dec-2017 19:54


How clever is this: AI will create 2.3 million jobs by 2020
Posted 19-Dec-2017 19:52


NOW to deploy SD-WAN to regional councils
Posted 19-Dec-2017 19:46


Mobile market competition issues ComCom should watch
Posted 18-Dec-2017 10:52


New Zealand government to create digital advisory group
Posted 16-Dec-2017 08:47


Australia datum changes means whole country moving 1.8 metres north-east
Posted 16-Dec-2017 08:39



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.