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Smooth pans from a PC

Discussion in 'Desktop & Laptop Computers Forum' started by azzo, Jun 8, 2003.

  1. azzo

    azzo
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    So I decide to stick with my HTPC on my AE100.
    But how do I get smooth pans.
    I'm using Power DVD 4. But this doesn't matter
    as Dscaler also gives me a problem when decoding interlaced
    PAL from my DVD player.
    The AE100 is giving me WIDE480.
    I am guessing it has something to do with PAL being at 50Hz
    and the pj being at 60?
    If this was the case then why does XGA at 75Hz give me
    the same problem?
    My standalone interlaced DVD player gives me perfect pans.
    Any ideas on how to improve this. Or am I just being fussy.
    Would a standalone scaler give me the same problems?
    Azzo.
     
  2. Jeff

    Jeff
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    On many/most LCD/DLP projectors the computer input is fixed to 60Hz, so whatever refresh rate you run the computer at, it gets converted to 60Hz in the projector. Running the computer at anything other than 60Hz is likely to add more stutter.

    An external scaler would use the component input on the projector, this is much more likely to at least accept 50Hz.
     
  3. Mr.D

    Mr.D
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    yep with stick with 60Hz from the PC and you should get stable pans ( well as stable as it can be).

    I certainly don't see much problem with pans on my own ae100 /htpc combo.
     
  4. Pootle

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    With my sanyo projector, I get the best DVD results by running the video card at 100Hz. The PJ isn't supposed to support this, but it works jut fine. For american DVD's though its better at 60Hz.

    In crouching...hidden, the pan near the begining 'through the wall' with the big vertical wooden columns is very near perfect at 100Hz, although I did notice a significant improvement when moving from an 800MHz processor to a 1.4GHz processor (which is the current system)

    I did try feeding s-video from the PC to the pj, and it did smooth motion a bit more, but the loss of quality in other respects far outweighs this improvement, indeed it may just have been the fuzzy image making it look smoother :D

    For real smooth motion, I find that a set top box feeding S-video to the PJ still gives far better motion on DTTV than through the computer, although of course the still picture quality is a lot lower.
     
  5. azzo

    azzo
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    Mr.D.
    You say you don't have a problem with pans on your combo.
    Are you sure? Am I just trying to find faults?
    I can't see what else I can do to improve things.
    Pootle.
    You say that you noticed a difference going from 800 to 1.4Ghz
    How can this be? Were you loosing any frames?

    I guess an external scaler using component would give me 50hz.
    Perhaps I need to move away from the HTPC (again)
    Azzo.
     
  6. Gary Lightfoot

    Gary Lightfoot
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    Try 75hz for PAL and see if that makes a difference.

    It probably won't, but it's worth a try...

    Gary.
     
  7. Mr.D

    Mr.D
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    Well I'm using theatertek for dvd playback and I mainly watch region1 material on it. However 50Hz material looks fine to me too.

    Dscaler is also nice and smooth through the HTPC . I use judderterminator .

    Have you used powerstrip to get a 1:1 pixel mapping at 60Hz and have you adjusted the clock and phase to get rid of any flickering?
     
  8. Pootle

    Pootle
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    No lost frames, I don't know why - it just did make quite a significant difference (running windows 98 at that time)
     
  9. azzo

    azzo
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    Yes, I am getting 1:1 mapping. No lost frames. Picture is 100% stable and sharp.
    Everything appears to be running fine.
    As I said, its the panning which isn't quite right.
    I'm using a Radeon 7000. With a - don't laught PIII550
    (CPU usage is 30%). Even dscaler give me 0 dpfs.
    It does look like the PAL material isn't quite in sync with the
    display. Its not so much a definite judder, its just not 100% smooth. May be some people don't notice it. But when I try my old interlaced DVD player. It is perfect. Makes me think why I am bother with HTPC after all.
    I will try some region 1 stuff to see what happens.
    I would have thought XGA at 75Hz would have been OK.
    But no, exactly the same phenonmenum.
    Azzo.
     
  10. Pootle

    Pootle
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    Azzo, what OS are you using? I suspect that XP, under normal pressures, quite often ducks out to examine its private parts, on a 550 machine this might take 5ms every second, but it will delay one frame, and the eye / brain is very sensitive to this. On a faster machine this would beonly 2ms, and would be much less noticeable.
    I think this may be why I noticed things getting a lot smoother moving from 800 to 1400
     
  11. azzo

    azzo
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    I am running W2K.
    I am sure I am not dropping any frames, but W2K might be
    soing something, ass you say.
    Interestingly my harddrive light is always on when watching dvds.
    I use to run W98 long ago, and I either did not notice, or
    it did not use to happen!

    Not another install please.
    Azzo.
     
  12. Madders

    Madders
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    I am running a Sony 11ht through windows XP, I find the "judder" varies according to the dvd playback software you use. Powerdvd XP is "worst" whereas Theatertek is a lot better and nvdvd 2.55 is probably the best with hardly any dicernable judder.

    Hope this helps. :cool:

    Steve
     
  13. Mr.D

    Mr.D
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    I'm running W2K . Watched Reign of Fire (region1) last night .. no irritating judder.
     
  14. azzo

    azzo
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    Mr.D.
    Are you using theatretek or powerdvd?

    Azzo.
     
  15. Mr.D

    Mr.D
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    TT 1.2 I think : its not the latest: I refuse to upgrade as my HTPC is rock solid.
     
  16. azzo

    azzo
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    Words of wisdom.
    If it ai'nt broke then don't fix it.
    Why can't I follow my own advice.
    Azzo.
     
  17. theritz

    theritz
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    azzo,

    Try NVDVD 2.55 - I found it to produce a smoother run than Powerdvd, and better overall picture performance. It's a 7mb download from Nvidia's site, 14 day trial....


    Sean G.
     
  18. azzo

    azzo
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    Thanx for that. A nice piece of software. Although it hasn't solved the problem. I am begining to think it is just me or the source material. I will probably end up getting an external scaler.
    Azzo.
     
  19. Mr.D

    Mr.D
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    Get theatertek!
     
  20. Caveat

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    With a lower spec cpu you might consider chucking hardware at it.
    I just bought a second hand realmagic hollywood+ card, and whilst the image is less sharp than the software players (ive tried all the ones mentioned here on a 1GHz Celeron) the pans *are* perceptibly smoother - perhaps a more recent hardware card would give sharp picture and smooth pans?
    Like you said it wasnt that I was dropping frames, just that I knew it wasnt smooth.
     

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