WinTV-PVR 250/350 (Model 30xxx, 32xxx, 48xxx) > Hardware (PVR 250/350)
Pulsing picture with PVR250
Detritus:
I was just watching Enterprise (very dark in general) on my PVR250 and noticed that the picture pulses about 4 times a second. It seems to be brightness related, at least with a dark show like Enterprise.
I then tried to see the same thing on some other channels and noticed that with normal brightness channels, there is only sometimes brightness pulsing, other times there seems to be noise/artifact pulsing. So I can still see a pulsing at the same frequency, but it looks slightly different.
I looked at the same channels on my Hauppauge WinTV and saw no such effect.
Has anybody else noticed this?
My best guess would be that this is somehow related to the noise reduction features? The chip has several of those..
The frequency seems too high to be GOP related.
Ideas?:)
Oh, I am using an NTSC version of the card and am in the US. I am using the 20175 driver and the 2.0.20108 MPEG2 software decoder.
Also, this pulsing is not VERY visible. But it is noticeable when looking at the picture more carefully.
SHS:
Dose it show in the recording?.
Detritus:
I've recorded something where I could clearly see it on screen. Here are my observations:
- The pulsing is visible while watching live
- The pulsing is visible when playing back the recording from WinTV2000
- The pulsing is visible when playing back in MediaPlayer on a computer with only the Hauppauge MPEG2 decoder installed
- The pulsing is NOT visible when playing back in MediaPlayer on a computer that does not use Hauppauge's MPEG2 decoder. The output is much noisier, though.
Also, I have to correct my previous statement. It's not 4 times a second, but more like 2 times a second. So it could very well be GOP (I-Frame) related, since my GOP is set for a length of 16 (and I have 30fps).
My guess is that the Hauppauge MPEG2 decoder smooths the output (since it's noticeably less noisy than when played back with a different software decoder) and somehow resets that smoothing when a new GOP is started. This could lead to pulsing and would also explain the pulsing of noise I've observed.
SHS:
can sent me a short clip so I can see it
Detritus:
15M ok? How do you want me to send it? icq?
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