[mythtv-users] PVR-250 480x480 jitter in hardware encode

[Bryan Ware]

I believe that you just described my issue to a tee, but unfortunately,
i have had no luck getting an answer from here or IVTV's mailing list.
It is how ever, a work in progress, So I am contributing it to driver
development and am hoping it gets cured with the next IVTV driver
revision.

Bryan
On Tue, 2004-04-13 at 12:34, john lawler wrote:
> Hi guys,
> 
> This has been a nagging problem for me ever since I got my box setup a 
> couple of months ago, but I'd forgotten about it ever since I switched 
> most of my recordings to VCD (MPEG-1 352x240) mode.  However, now I want 
> to record some shows and transfer them to SVCD, so I need to capture at 
> the default 480x480 resolution and use nuvexport for it.
> 
> However, here's the problem.  I followed Jarod's guide almost verbatim 
> (a few unimportant divergences), which means I have all the ivtv 
> versions (including firmware) that he suggested and all of that, though 
> I haven't done any special tweaking of that driver or anything.
> 
> Whenever I record something in 480x480, at various points during 
> playback, I get this annoying tearing or jitter in the video, where a 
> couple of frames tend to slide out of the picture, or something, and 
> then it'll go back fine for several seconds or even a few minutes and 
> then come back.
> 
> I've exported the shows using nuvexport to SVCD and played them in 
> Winamp on a windows machine and I get the exact same jitter in the exact 
> same points--this conclusively proves that the problem is not in 
> playback on the myth box.  Thus, it must be entirely in the capture, 
> which narrows things a bit.
> 
> I've already googled and searched the mailing list, of course, and I 
> hear murmurs about somewhat similar issues, but nothing that sounds 
> exactly the same.
> 
> I also don't have any problem with the sound sync or anything else, it's 
> just those frames flickering from time to time.
> 
> So... anyone else have a similar experience?  Preferably with a 
> rock-solid resolution?  I figure it probably has something to do with 
> either ivtv having a slight bug in it or my configuration of ivtv.
> 
> Thanks a bunch guys,  mythtv rocks!
> 
> jl
> 
> =====
>    hardware specs (for reference and posting)
> =====
>      Chaintech 7NIF2 mobo (get the exact BIOS date, think it's 9/xx/2003)
>      on board nvidia nforce2 video (w/ shared system memory) + TVout
>          + audio + net (all on board)
>      Athlon-XP 2400+
>      512MB PC2700 Crucial RAM
>      Hauppauge PVR 250
>      Western Digital 60GB hd 7200rpm
> 
> =====
>    software specs
> =====
>      essentially identical to Jarod's guide as of about mid-March 2004.
> 
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