Stuttering Pictures

Forum Forums Freeview HD HDR 1800T, 2000T Stuttering Pictures

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  • #18566
    Anonymous
    Inactive

    I have an HDR 2000T and am seeing a lot of stuttering when viewing through the box. This happens a lot on channels such as Quest. It appears to be a buffering issue. The motion freezes for a second or 2 then jumps forward to live again. While this happens, the sound continues as normal. If I view the same channel directly via the TV it does not do it. The BBC/ITV main channels don’t appear to have a problem. When the problem was particularly bad I paused the live stream for a few seconds, then pressed play. This stopped the freezing but there was a glitch, like very minor blocking, whenever the freezing would have occurred, if that makes sense. My signal is strong and very low in errors. Any ideas?. I just had a thought when I typed the last sentence, could the signal be too strong?

    #75424
    Martin Liddle
    Participant

    paulius55 – 1 hour ago  » 

    My signal is strong and very low in errors. Any ideas?. I just had a thought when I typed the last sentence, could the signal be too strong?

    Tell us the signal strength and quality as reported by the Humax on the problematic channels. Yes too high a signal strength can be a problem if it overloads the tuners.

    #75425
    Anonymous
    Inactive

    Will do as soon as the recordings have finished, as the signal strength option is greyed out. Interestingly, the offending channel is not stuttering while the unit is recording 2 other channels, could it be that the signal is now being shared between the live buffer and the 2 tuners and is therefore reduced?

    #75426
    Anonymous
    Inactive

    Was happening on 5USA this evening. Latterly during NCIS Los Angeles about every two minutes.

    #75427
    Anonymous
    Inactive

    Hi Paulius.

    I reckon its a weak signal, interference or misaligned,faulty aerial which will cause stuttering problems. I can only assume the picture pauses because its missing packets of data due to interference or aerial problems

    Its the stage before the picture just goes black with the weak signal message.

    Ive seen what you have experienced and it was casued by some fault in the aerial system. It only happened to me on an HD band but its now all working fine.

    Whats interesting is sometimes rarely my telly tuner will go blocky but ive never seen the Humax tuner do that so its not a bad tuner in the unit

    Im afraid it can be a frustrating process of elimination starting with your local transmitter and finding if they are doing any work or whether your area/street gets a good signal. Then its a case of working out if your aerial is up to date on spec..amy buidings trees in the way etc etc…It can be niggly as there are quite a few factors to consider

    Some sort it with an aerial engineer on call out which isnt cheap. Luckily my landlord sorted out the aerial system which was usually pretty good so fingers crossed everything is working well now. Oh how I hate not having my own aerial :) so you may have more control than me there.

    All the best with it

    #75428
    Anonymous
    Inactive

    I am not convinced that it is a low signal. I checked the signal strength and quality of each MUX with the Humax and the lowest was 93/100 and the average was 98/100. It only happens on particular channels. Having said that, for 2 days now it has not done it, may be hard to track down.

    #75429
    Anonymous
    Inactive

    Tend to agree with Paulius as I am on a communal dish. I experience also a momentarily loss of picture (not sound nor the box turning off) for just a split second and that is on the 5 network. As I have posted elsewhere. That happens at least twice per week. Plus for example the wife watches Neighbours and they put a notice on the screen of the next programme. It stutters then. Like Pasulius the afore mentioned stuttering has abated.

    #75430
    Martin Liddle
    Participant

    paulius55 – 1 hour ago  » 

    I am not convinced that it is a low signal. I checked the signal strength and quality of each MUX with the Humax and the lowest was 93/100 and the average was 98/100. It only happens on particular channels.

    In my experience those signal strengths are too high. I would suggest if the problem returns then you try an attenuator in the aerial feed and aim for a signal strength of around 80%. Anything over about 45% should work well and at one time we had a signal strength of around 30% for several months with few problems.

    #75431
    Anonymous
    Inactive

    Yes it was interesting when I hooked up another box the signal strength was on a different scale. One box read 38% to 58% and the Humax was reading in the 78% area. Makes me wonder whats going on there but both boxes were displaying a fine picture.

    I just think occasionally the data transmission does get interupted considering the amount of channels broadcast over the airwaves Im amazed that I have 100GB of recording already with no glitches considering the vast amount of data stored.

    In terms of picture quality the Humax 2000T has been superb

    #75432
    Anonymous
    Inactive

    patsy – 2 days ago  » 

    Was happening on 5USA this evening. Latterly during NCIS Los Angeles about every two minutes.

    I also had this problem with NCIS:LA.

    I don’t think this is the same problem as the original poster.

    I found that the same thing occurred on 5USA+1 at exactly the same point in the programme – the fault must have been elsewhere.

    Strangely, I have had similar problems with NCIS:LA on CBS Action – although no other channel on the same multiplex seems to have a fault. :?:

    #75433
    Anonymous
    Inactive

    Minstrel SE – 12 hours ago  » 

    Yes it was interesting when I hooked up another box the signal strength was on a different scale. One box read 38% to 58% and the Humax was reading in the 78% area.

    Nothing unusual here the signal strength shown as a percentage is not an absolute mesurement, unlike dBW or microvolts at the antenna input.

    Each manufacturer will have its own idea of what is 100%, based on their tuner ‘front end’ circuitry. If I measure signal strength on my Freeview devices i.e.Sony, Sharpe, and Humax, I get different results for each. As has been stated before Humax appear to prefer an indicated signal strength between 60 – 80%.

    Signal quality measurement is another question altogether.

    #75434
    Anonymous
    Inactive

    Yes signal quality seems to be 100% on everything but it would be nice to see some consistency between boxes on the strength,

    You see I have an amplified aerial system for 40 flats which must be like spaghetti junction in a large 3 storey building. Im not keen on amplification in line unless I have full control of whats going on. I wouldnt necessarily need amplification with my own aerial in my own home. I like to be in control of attenuation and other factors

    So it would have been nice to see a consistent reading between boxes because at the lower end 38% seems very low. The picture seemed fine though which is confusing because I have been brought up to believe that lower strength readings on FM and other equipment just arent acceptable.

    It just seems strange to me that if they have a scale of 1 to 100 thats quite some leeway for the picture to be ok at 38% to 58% on a Huawei I tested. Fair enough the Humax is reading up to 80% I would presume the ideal was 100 on both readings.

    I also wonder if the sheer amount of channels per band is just no good as I would have thought some compression and cutting corners is going on.

    Im mainly a BBC watcher though and its bliss deleting many other channels and having a small favourites list

    #75435
    grahamlthompson
    Participant

    Minstrel SE – 8 minutes ago  » 

    Yes signal quality seems to be 100% on everything but it would be nice to see some consistency between boxes on the strength,

    You see I have an amplified aerial system for 40 flats which must be like spaghetti junction in a large 3 storey building. Im not keen on amplification in line unless I have full control of whats going on. I wouldnt necessarily need amplification with my own aerial in my own home

    So it would have been nice to see a consistent reading between boxes because at the lower end 38% seems very low. The picture seemed fine though which is confusing because I have been brought up to believe that lower strength readings on FM and other equipment just arent acceptable.

    It just seems strange to me that if they have a scale of 1 to 100 thats quite some leeway for the picture to be ok at 38% to 58% on a Huawei I tested. Fair enough the Humax is reading up to 80% I would assume the ideal was 100 on both readings with attenuation not being a factor

    I also wonder if the sheer amount of channels is just no good as I would have thought some compression and cutting corners is going on.

    Im mainly a BBC watcher though and its bliss deleting many other channels and having a small favourites list

    FM is analogue and like analogue TV signal strength affects quality.

    Digital is completely different in that if the inbuilt error correction can cope the picture quality is identical. 100% quality indicates the received signal is not using any of the in built error correction to produce a bit accurate output stream.

    http://aerialsandtv.com/digitaltv.html#InferiorDigitalPictureQuality

    If the signal is too strong for the tuner the indicated power level can actually fall as a result of the UHF carrier being clipped at the peaks of the sine wave.

    #75436
    Anonymous
    Inactive

    Thanks and that is a very good article. I agree with the tone of the article that digital tv transmission is far from perfect.

    I was fairly happy with my CRT TV but games consoles showed its limitations in resolution and it was bowing menu graphics lines etc. However it certainly had some clear advantages on TV broadcasts in terms of frame rate and motion. On standard TV definition they were set up for interlaced CRT and it was quite a shock when I first saw standard definition on an LCD flatscreen

    I accept that crt is power hungry, no longer manufactured and I have to move with the times

    With HD channels and xbox playing I do enjoy a flatscreen tv and I accept I have a cheaper low end model.

    I do agree with that article that they go remarkably quiet when asked about the fine detail of digital transmission specs.

    So all in all I am now happy with the picture on the Humax and am going to resolve the noisy hard drive issue. I am the sort of person that needs a couple of months to settle in with a product especially with an issue that may be subjective. I now feel ready to present my case and see what they will offer to ensure Im getting a quieter one

    #75437
    Anonymous
    Inactive

    I have the same problems, it started when we got G4 signal in the area, we were told the we could have problems with the signal and if so ‘free filters’ would be fitted, which I had done.

    As with other posters in this forum, watch through Humax and freezes, bypass humax and all is well.

    I wonder if any other recorder manufacturer has the same problem with G4

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