DVB-C: stutter, other hints please? (1 Viewer)

[hansdegit]

Easy.

You mean: try MyTheatre to check whether the FloppyDTV is faulty? Does MT report statistics about framerates etc.?

I've set up MyTheatre, but I have to dig in a bit deeper; MT is able to tune in and lock a signal, but I've not seen a graph yet. I think that is a classic case of "RTFM".
Nice exercise for tonight.

 

[mPod]

No idea what MT reports and what it doesn't. I don't have a FDTV. But using MT you can check if the stuttering is still there. If so, I'd try the same on a freshly installed system. If it's still stuttering then, you can for sure blame the FDTV device.

 

[thiskl]

I use PureVideo v1.02-223 with a Radeon 9800pro.

In my experience, the PureVideo decoder will always stutter with progressive DVB streams; ie. 576p or 720p.

As a test, try changing the De-interlace Control to Film (from the NVIDIA Decoders Properties page).

 

[hansdegit]

Moderator: would you be so kind as to change the title of the thread? This stuttering does not originate from Purevideo, it relates to stuttering in general. On my computers, that is...

This is the status:
- In MyTheatre, the exact same stuttering.

I'm lost here....

 

[Taipan]

Moderator: would you be so kind as to change the title of the thread?

done

This is the status:
- In MyTheatre, the exact same stuttering.

I'm lost here....

I think that narrows down the cause to the TV signal level, or a faulty DVB card?

 

[hansdegit]

I think that narrows down the cause to the TV signal level

If the TV-signal is the cause, then I would expect that to be visible while watching TV through my STB, which is attached to the same amplifier, but split in three. However, this STB reports 48% signal strength and 100% signal quality. I assume that the signal to the FloppyDTV is much stronger, because it utilizes a 'private line' to the amplifier. To make sure, I can put in an extra amplifier...

or a faulty DVB card

Later this week, I will try another FloppyDTV.

One strange thing is bugging me: a recording, done on my HTPC, transferred to another PC stutters; reproducable at exactly 1m04s. On my brother's PC this same video runs smoothly....I've asked him to send me the ouput of dxdiag (dll's, versions, etc.)

Taipan, you use an Ati graphics card, right? On an AMD system? Would you be so kind to send or post your dxdiag (tab 'directX files') output?

TIA.

 

[Taipan]

[f the TV-signal is the cause, then I would expect that to be visible while watching TV through my STB

No, not necessarily. From my experience, DVB cards have a much poorer RF performance than dedicated STBs. So a DVB card will display "stuttering" long before a Digital STB will, as the signal level deteriorates.

One strange thing is bugging me: a recording, done on my HTPC, transferred to another PC stutters; reproducable at exactly 1m04s. On my brother's PC this same video runs smoothly.....

Hmmm - that is odd ...

Taipan, you use an Ati graphics card, right?

Correct.

On an AMD system?

Correct.

Would you be so kind to send or post your dxdiag (tab 'directX files') output?.

It is attached - HTH ....

(I have attached the whole output file, in case you want to look at other areas.)

 

[hansdegit]

Thanks Taipan. This is my plan:
- Plug the antenna cord which normally feeds the FloppyDTV into my STB to see what signal strength it reports
- if below 80%, connect an extra amplifier and check again.
- try my brother's tuner.

Why is it that dScaler or MPV do not stutter and the commercially available decoders do? Since I use FFDShow, they all operate in software-mode...

 

[tourettes]

Why is it that dScaler or MPV do not stutter and the commercially available decoders do? Since I use FFDShow, they all operate in software-mode...

Different decoders are handling the corrupted mpeg2 stream in a different ways. Other decoders (Nvidia for example) is dropping frames and some others are outputting some garbage to the screen (green, yellow wtc. 'boxes').

 

[hansdegit]

Would you believe this: SOLVED!!!!!

I Am so unspeakably happy! My problem is solved.

This evening I inserted another CAM in the FloppyDTV and guess what: smoooooth tickers, smooooth motion, everything so -er- natural.

My problem is hardware related. The CAM that is causing all the problems is an Alphacrypt version 3.05 by Mascom. The CAM I inserted tonight is also an Alphacrypt, but version 3.09. Now my first guess would be to upgrade my CAM to version 3.09, but frankly, I would like to throw this one out the window. I just want a new one...

Hopefully the vendor will supply me with a new one. If not, then I can always try to upgrade to version 3.09. Actually, I'm pretty convinced that the problem is not firmware-related; too many people use version 3.05 without problems.

Thank you all for your patience and advice!