Better HD TV Quality

[astace1966]

Hi,

 

I have used DVBViewer for the last 2 years using a satellite feed.

The HD content in the UK via this source has been limited although recently it has improved. My system handles regular TV without a problem but not so HDTV particularly when there is rapid movement in the picture, e.g. sports or action movies. At this point the picture begins flickering. This effect occurs when DVBViewer is run in full screen mode (my TV is a 50" screen set to 1080p). If I reduce the size of the DVBViewer the picture quality improves and the frame rate increases suggesting that either the hardware or software is unable to cope.

I have tried various combinations of codecs and renderers including Cyberlink's PowerDVD 8 and 9, CoreAVC, ffdshow.

My PC also has a Blu-ray drive which, when used with PowerDVD9, produces excellent quality video.

All my hardware drivers are up to date.

Can anyone suggest how I can improve the performance of my HDTV using DVBViewer (version 4.5 now installed)?

 

Thanks,

 

Andrew S.

 

System Spec:

TV = Pioneer KURO PDP-LX5090

PC =

Intel Core 2 Quad Q9400 (2.666Ghz, 6Mb Cache)

4Gb 8000Mhz DDR2 SDRAM

NVIDIA GeForce 8500GT 512Mb

Vista Home Premium 64-bit

Hauppauge WinTV Nova HD-S2

QED HDMI cable

[Pynkyz]

Your computer is certainly powerful enough...there must some other problem. Like the deinerlacing set in your video codec, or the configuration of your video card drivers (for example, make sure that "Inverse telecine" is disabled).

[Tjod]

I would guess a deinterlacing problem or the TV station uses different encodings for live transmission.

[uglyned]

Are your display settings set to 50Hz rather than 60?

[johnoo]

Are your display settings set to 50Hz rather than 60?

I thought 50hz was the correct setting for uk pal?,anyway I have my hdtv set to 50hz and the picture quality fullscreen with BBCHD and ITVHD is excellent with no flickering etc.I'm using windows 7 and the microsoft codec BTW.

[uglyned]

50Hz is right. I meant that they should be 50 not 60.

[astace1966]

Thanks for your replies.

 

The refresh rate was set at 60Hz but changing it to 50Hz has had no noticeable effect. I have set both the video card and tv to the same frequency.

 

Stopping the deinterlacing improved the quality a little.

 

One obvious symptom is that when set to full screen the video lags behind the audio by several seconds. When the size of the screen is reduced the video speeds up as if in fast-forward mode until video and audio are in sync.

 

I am using the CoreAVC H.264 video decoder and the EVR Custom video renderer. The DVB Source (3.5.2.0) Properties shows that the BBC HD channel is broadcasting with H.264 video, 1440x1088, 25fps.

 

Would you recommend a better combination of codec and renderer?

 

Thanks

 

Andrew

[desweil]

60Hz must have had a noticeable effekt on MOVING objects. 50HZ is the correct setting. Try the cyberlink decoder with DXVA activated. You can get it via the Powerdvd trial version and register it manually with RADLight Filter Manager as explained in the forums. EVR Custom Renderer is the recommended option so no need to change here.

[mborkP]

Hi,

try to set it up to 1080i/50Hz no deinterlacing. I run it like this in Australia which is PAL as well. No problem here on 58" plasma.

 

Cheers

Edited October 25, 2010 by mborkP

[dvbrewer]

I am using the CoreAVC H.264 video decoder and the EVR Custom video renderer.

The deinterlacing using CoreAVC isn't so good (even if you set it to use hardware), try Cyberlink PDVD 10 codec, you can get this with the Shark codec pack- select PDVD10 and DXVA as default in Shark H.264 settings.

[mborkP]

Hmmm, let me understand.

The native tv stream is interlaced and for PAL it is 25fps -> 50fps interlaced. The tv sets are working with interlaced material natively. So deinterlace function is really needed for monitors which are progresive only. I've been mucking around with it for a quite some time and visually the 1080i at 50Hz work best for me. Even if the signal get deinterlaced finally by tv set, I think it does better job then anything I tried so far.

 

Just curious....

 

Thanks

[dvbrewer]

Hmmm, let me understand.

The native tv stream is interlaced and for PAL it is 25fps -> 50fps interlaced. The tv sets are working with interlaced material natively. So deinterlace function is really needed for monitors which are progresive only.

It depends on the TV and the videocard, in some cases the deinterlacing on the videocard will be better, but some on the TV it will be better.

[Pynkyz]

Afaik some CoreAVC versions encounter problems with sources that are 1440x1080

[astace1966]

Hello again.

Thank you for all your replies.

Things have improved again so I now have quite a good stable HD picture.

I noticed that the BBC HD picture resolution is 1440x1088. The native resolution of my screen is 1920x1080. Having altered the video card's resolution to 1440x900 (the closest match) the picture is very good although there is an audio lag (which disappears when I reduce the size of the window.

Using CoreAVC as CyberLinkH.264 PDVD8codec doesn't now seem to work even thoughI own a full version of PowerDVD9 Ultra.

Ideally I want HDTV at a 1920x1080 resolution so I will continue searching for the best setup.

 

Andrew

[dvbrewer]

I noticed that the BBC HD picture resolution is 1440x1088. The native resolution of my screen is 1920x1080. Having altered the video card's resolution to 1440x900 (the closest match) the picture is very good although there is an audio lag (which disappears when I reduce the size of the window.

It is really not recommended to run in anything other than the native resolution on LCD or Plasma screens. 1440X1088 is always converted to 1920 x 1080 anyway.

 

Using CoreAVC as CyberLinkH.264 PDVD8codec doesn't now seem to work even thoughI own a full version of PowerDVD9 Ultra.

I can't really recommend that, CoreAVC does not do correct deinterlacing, see this clip and screenshots made with CoreAVC and the Windows 7 Microsoft DTV-DVD decoder.

 

OK, I didn't notice your video card 8500GT, it is really out of date, I recommend you upgrade, for now try using the ffdshow decoder which will use your CPU.

Edited November 6, 2010 by dvbrewer