I have a panasonic 50px70 and have noticed that the picture moves around in the background like all the scenery etc is alive, has anyone else noticed this.
Picture noise on my Panasonic plasma.
- Thread starter beater
- Start date
Tonya
Well-known member
Don't worry, your not imagining this!
There's nothing inherantly wrong with your screen, the problem you describe is a well known manifestation of poorly coded material, clearly seen in SD broadcasts and DVDs sourced from dubious analogue masters.
You will notice that it's not usually present when watching BluRay discs or HD TV as the bitrate is much higher so there is no need for such drastic data compression tecniques with these formats.
Here comes the really oversimplified science bit.
Technically speaking, the "floating scenery" artifacts are due to the way the original source material is encoded.
To save space, only key frames are fully encoded, then after that, only the differences between the last key frame and the next frame are saved, and subesquently decoded by your TV or disc player.
Lower bit rates mean less information is available to handle the changes effectively.
To be more efficient in TV broadcasting, the rate at which the material is encoded is variable, so for example a sports event will demand much more data to look smooth than, say, a shopping channel where there is little or no fast moving "action" taking place.
I remember years ago that the trend for DVD releases was to pack as much extra material on the disc as possible to increase the "value for money" rating, however the quality of the film tended to suffer.
Then the film companies stared to re-release the same film in a higher bitrate by stripping all the extras, thereby creating more space for the film data, and calling it "SuperBit Edition" (what a scam!).
These artifacts are now almost history, thanks to the extended capacity of BluRay discs and HD television transmissions.
There's nothing inherantly wrong with your screen, the problem you describe is a well known manifestation of poorly coded material, clearly seen in SD broadcasts and DVDs sourced from dubious analogue masters.
You will notice that it's not usually present when watching BluRay discs or HD TV as the bitrate is much higher so there is no need for such drastic data compression tecniques with these formats.
Here comes the really oversimplified science bit.
Technically speaking, the "floating scenery" artifacts are due to the way the original source material is encoded.
To save space, only key frames are fully encoded, then after that, only the differences between the last key frame and the next frame are saved, and subesquently decoded by your TV or disc player.
Lower bit rates mean less information is available to handle the changes effectively.
To be more efficient in TV broadcasting, the rate at which the material is encoded is variable, so for example a sports event will demand much more data to look smooth than, say, a shopping channel where there is little or no fast moving "action" taking place.
I remember years ago that the trend for DVD releases was to pack as much extra material on the disc as possible to increase the "value for money" rating, however the quality of the film tended to suffer.
Then the film companies stared to re-release the same film in a higher bitrate by stripping all the extras, thereby creating more space for the film data, and calling it "SuperBit Edition" (what a scam!).
These artifacts are now almost history, thanks to the extended capacity of BluRay discs and HD television transmissions.
jase fox
Well-known member
Ive only noticed it on SD broadcasts to, so your not alone Beater, its just one of those horrible side effects you get from upscaling SD material.
But you get used to it after a while. When i first got my plasma some time ago & i noticed this i used to pay more attention to the background noise than the main picture that your supposed to be watching ha It was so distracting, but used to it now.
But you get used to it after a while. When i first got my plasma some time ago & i noticed this i used to pay more attention to the background noise than the main picture that your supposed to be watching ha It was so distracting, but used to it now.
Thanks for your reply jase, I also tend to watch the background more than the main picture, how much do you have your sharpness turned up because lots of people say it should not be up to high but if it isn't the picture looks to blurry.
Not sure if the problem i had will be relevant to you but for what it's worth here goes.
My tv is a 36" crt by the way.I was seeing text moving around behind the picture i was watching,only on tv normal digital broadcasts,playing dvd was fine.I asked a question on another w.site that deals with digital tv problems.
My tv av1 scart was connected to av1 on a twin tuner pvr,from it to av1 on a dvd/recorder,this also has a digital tuner,from the recorder to av2 on the tv.The aerial to twin tuner first etc.
I was advised to try breaking the loop because the pvr was picking up a signal somehow from the recorder.I did this and connected the units to the tv independently & i haven't had any noise/interference or whatever since.
As i say,sounds similar but with you having hd tv yours might be a completely different problem,but if you have more than one tuner inter connected,might be worth a thought.
My tv is a 36" crt by the way.I was seeing text moving around behind the picture i was watching,only on tv normal digital broadcasts,playing dvd was fine.I asked a question on another w.site that deals with digital tv problems.
My tv av1 scart was connected to av1 on a twin tuner pvr,from it to av1 on a dvd/recorder,this also has a digital tuner,from the recorder to av2 on the tv.The aerial to twin tuner first etc.
I was advised to try breaking the loop because the pvr was picking up a signal somehow from the recorder.I did this and connected the units to the tv independently & i haven't had any noise/interference or whatever since.
As i say,sounds similar but with you having hd tv yours might be a completely different problem,but if you have more than one tuner inter connected,might be worth a thought.
Hi beater, I know what you mean, would it be a thought to check the how to section on this site for tv settings, maybe a few tweaks might help, it worked fairly well for me.
jase fox
Well-known member
beater:Thanks for your reply jase, I also tend to watch the background more than the main picture, how much do you have your sharpness turned up because lots of people say it should not be up to high but if it isn't the picture looks to blurry.I have my sharpness turned up just two nothches (which isnt even half way) just enough to define the edges as like you say if you were to turn it off completely then the picture does go to soft.
To be honest beater its a fighting & losing battle to try & get rid of it completely, its just a side effect of the upscaling SD material im afraid. If whilst your ever in your plasma lab & you do come up with a solution then please do let me know, so ill leave you to put your white jacket & thick black glasses on with your hair gel'd back for you to find the cure, ha
To be honest beater its a fighting & losing battle to try & get rid of it completely, its just a side effect of the upscaling SD material im afraid. If whilst your ever in your plasma lab & you do come up with a solution then please do let me know, so ill leave you to put your white jacket & thick black glasses on with your hair gel'd back for you to find the cure, ha
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