Options
Motion Artefacts, New HD Channels
![[Deleted User]](https://w6.vanillicon.com/v2/61f1c8b2f9ac0360e83376ef85fb8ee0.svg)
[Deleted User]
Posts: 44 Forum Member
✭
I have a Toshiba RV753 series TV and am getting motion artefacts on the new Freeview HD channels (specifically, I've noticed it on BBC 4 HD and BBC News HD, haven't looked at others...). The problem manifests itself as "stuttering" - every few seconds it will be as if one or two frames have been dropped. It's particularly noticeable on scenes with a lot of movement (eg panning shots). There is no other degradation to the picture.
I at first suspected the lower transmitter power, but that's been ruled out by an aerial engineer - I'm getting a good signal and the TV is reporting an error rate of 0.
I know the Toshibas had a problem with the original HD broadcasts - they couldn't cope with the mixture of interlaced and progressive frames and flickered badly until there was a TV software upgrade. Is there something different about the way the pictures are coded on the new channels that might be triggering this behaviour in the TV?
I at first suspected the lower transmitter power, but that's been ruled out by an aerial engineer - I'm getting a good signal and the TV is reporting an error rate of 0.
I know the Toshibas had a problem with the original HD broadcasts - they couldn't cope with the mixture of interlaced and progressive frames and flickered badly until there was a TV software upgrade. Is there something different about the way the pictures are coded on the new channels that might be triggering this behaviour in the TV?
0
Comments
I can't say I have noticed any real difference between, say BBC2 and BBC4 HD in terms of image quality and artefacts. Not aware of any stuttering effects as you describe.
Do you have anything else, eg a PVR with Freeview HD, you can compare the TV with? That might point up whether it is a TV problem or something with the broadcast.
It's perfectly fine with the original Freeview HD channels (BBC 1, BBC 2 and even BBC 3) which leads me to suspect a change in the options being used by the new stat mux.
There shouldn't be. You're right, both PSB 3 (the universal 'HD' mux) and COM 7 (the new 70% of the UK mux) both employ dynamic p/i switching.
The only difference is the BBC/ATOS code and mux PSB3, while Arqiva code and mux COM 7
But I have not seen problems on a Sony Bravia
Nor me. I'm told the same manufacturer of coder is used for both muxes, though presumably Arqiva's will be newer hardware ?
They certainly are using very different subtitle encoders
https://dl.dropboxusercontent.com/u/26590349/ToshHiccup.mp4
You can see the jumps in the scrolling caption - they're not caused by the recording process, they're there on the screen...
Perhaps the original channels were using all the available bandwidth (and exceeding the processing power of the decoder) and are now down to more "normal" bitrates?
Since the set had a 5 year warranty, the repairers were called and have replaced the set's tuner and logic board without avail. So far, more than 5 weeks have elapsed from their first visit without any resolution.
Toshiba are claiming it's a "transmitter problem", despite the repairers taking the set to an adjacent transmitter area and reproducing the problem there.
It has all the hallmarks of the set's software choking on H.264 tweaks that weren't in use when it was first marketed (and were first introduced on the new HD mux and then retrofitted to the original mux), but the manufacturers are adamant it's not their issue.
It looks like the original vendor is going to have to replace the set as Toshiba's best response so far is to offer to supply an identical model (presumably with an identical problem) some time in January.
If they do, I'm going to insist it's not another Toshiba.
http://forums.digitalspy.co.uk/showthread.php?t=2024736
Toshiba say: out of warranty its not our problem, get it repaired yourself or ask Amazon for refund.
Amazon say: sorry its out of warranty, not our problem ask Toshiba.
Pass the buck.
It's the transmitters ,in my opinion operated by a bunch of morons .
It's not rocket science to do it properly .
And you have experience of this as a professional engineer do you?
By the way you put a space after a comma not before it.
I am a professional engineer !
Nit picking on my grammar ,is what I come to accept is what jobsworth do.
A professional engineer, I rather doubt that. I have spent my life surrounded by them, civil as well as electronic. Let's just say you don't fit the mould.
Everyone has a right to give their opinions on these forums but there is a difference between giving an opinion and having a silly vendetta against professional organisations such as Arqiva. The fact that their transmitters serve over 60 million people and that complaints, even on DS, are few, shows that they are successful wether you like it or not.
I have personal reasons for disliking Arqiva as I have a issue with monopolies and market rigging .
However these days this is common practise in large organisations and it goes on all around us , the utilities are examples .
This forum is not the place to vent my frustration ,so I apologise .
I will focus on just technical issues on any future posts I make and keep my feelings about Arqiva out of DS.
I'm sure you will have plenty of interesting things to add to these forums. By the way I have never worked for Arqiva although I did spend a year on an attachment to BBC transmitters a very long time ago. I have spent most of my life as a broadcasting engineer, mainly with ITV.
Yesterday's a516digital may be relevant to your long standing problem.
http://www.a516digital.com/2015/04/video-glitches-on-bbc-freeview-hd.html