780G HD video always Studders

[feilh]

Setup:

Gigabyte board with 780G, 4850E cpu. HVR-2250 recording QAM, Vista 32 bit HP, GBPVR 1.3.11

I've been trying to get HD to play without studdering for months now. I've tried ATI drivers 8.11 mostly. Just recently tried 9.3, 9.4, and 9.5 and got even worse results and went back to 8.11.

For the mux I have manly used AVIVO 8.11.

For the demux, I have tried the following:

Microsoft MPEG2 - moderate studder but never blue screens. If I use with Media Player then the Video is beautiful and smooth with low CPU util.

ATI - Similar studder blue screens whenever there are strange spots on the recording.

Cyberlink 7.3 - Better then microsoft but still studders. I haven't tried any sort of registry changes. If I play with CyberLInk PowerDVD software then the video is beautiful and smooth with low CPU. Bluescreens when the recording has bad spots.

FFDSHOW - so many version out there with so many options, I don't even know how to explain what I tried. It was always worse then Microsoft.

NVIDIA Purevideo - default configuration. Moderate studder similar to microsoft. Turning off hardware accel makes things look much much worse.

So if I play my recordings with Media Player or CyberLink things look great, but not in GBPVR.

Anyone have suggestion what to try next other then giving up?

[JonnyCam]

Why don't you see what decoder is being used in media player (I thin it's under file properties when it's playing)
Also check under options / performance / advanced and see if it's using overlay or not.

[johnsonx42]

Yes, I've had all of the same problems. Something in GB-PVR appears to block hardware acceleration from working properly in some cases. Sub insists that GB-PVR just builds a graph and asks directshow to play the video the same as Windows Media Player would, but something is getting lost in there somewhere. Like you, I can play any file recorded with GB-PVR in an external player, and it's perfect... play the same file within GB-PVR and it stutters and tears. The only way I've been able to get any decoder to work is by disabling de-interlacing in the decoder; then it plays fine, but of course interlaced channels don't look so great.

At the moment I use ATI Mpeg-2 decoder for TV playback, and Cyberlink PDVD8 for DVD playback. In CCC, I have de-interlacing set to Weave (which I understand is effectively 'none'). I get about the same results using Cyberlink for TV playback, but I have to go into the registry and disable hardware acceleration for PVRX2.exe, or it stutters horribly on 1080i channels.

Like you I've been through every catalyst version since 8.11 with no better result. I haven't tried 9.5 yet, because I've given up for now.

No one formula works for everyone, that's just what I've found to give me tolerable playback after weeks of pain and agony.

Are you on Vista or XP?

[imagn]

I have also had issues with GBPVR and playback. I am using a slightly upgrade version of the 780g but effectively the same.

First in my experience everything plays fine in WMP no problems, but have different results in GBPVR. Second, each catalyst driver has give me different results and i am using 9.4 and vista. 9.5 actually broke some of the playback in GBPVR with most of the codecs. Third, i had a hard time getting my setup to work in XP and so i have heard similar from others, and Vista cleared up a lot of playback issues but not all.

After reading a lot i came to the conclusion that deinterlacing is the cause of most of the issues, and that the video card was not handeling it, and should be. I ended up getting really decent playback after reading the following link with FFdshow:

http://www.avsforum.com/avs-vb/showthread.php?t=719041

Pay attention to the advanced FFdshow setup especially the deinterlacing section, i found that this setting helped but there are others in the section that help as well"

"The output in ffdshow needs to be nv12 for my ati video card, and yuy2 for my intel integrated video card. Only select one depending on which one you need, don't select any other colorspace."


"In the output of ffdshow you need to check: "Set interlace flag in output media type", method auto, field auto."

Take a read see if you get good results, it may or may not work, as i have to agree with johnsonx42 it will be different for everyone

[pBS]

try a different demux...ati doesn't make one...i use the mpchc mpeg demux...
[it also works for .ts, .m2ts, and .mpg]
[add "MPC - Mpeg Splitter (Gabest)" in config.xml for demux]

what renderer are you using?

you don't want to do deinterlacing in software, it's a huge tax on cpu...
to do it on a ati card, you have to set to nv12 and 'interlace' flag stuff like he said...
and in CCC, set to 'auto', no need for anything else...

darn, you're on vista...i found it pretty unstable and hard to work with as far as accell is concerned...
probably something in the background wasting cpu cycles...[win 7 is sooo much better]

one note, on the 3450 cards i use, if htey only have 800mhz mem, i have to tweak by auto-overclocking with CCC to get flawless h.264 playback..[tho it's pretty close without it]
all the 1000mhz cards i've tried work great out of the box w/8.11 cat...
but mpeg2 should work fine as is...tho i have a feeling the shared memory on the onboard 780g chip isn't as fast [or most people run it with 8000mhz main memory] as a real 3450..
[most of the 800mhz cards are using 'hypermemory' which is almost same as 780g method]

ffdshow should work fine with those settings mentioned, at least for mpeg2, and ati should also if ccc deinterlacing set to auto...leave antialiasing,etc. off in 3d settings..

also, have you tried the ati tweak script? it may be just what you need...

[imagn]

pbs -

Can you provide a link for the mpchc demux i am encountering some sync issues with FFdshow and other codecs are causing other issues and would like togive it a try

[BigMoose]

I've got a gigabyte 780g and was using various ATI drivers but found CCC generally stuffed up my interlacing settings so gave up and used powerstripe instead. However when i recently rebuilt from scratch (vista64 reinstall) I discovered the gigabyte's own drives (based on ATI 8.11 I believe) work very well. I have perfect mpeg2 playback on all UK SD DVB-S channels and near perfect H264 1080i for BBC/ITV HD and the Irish H264 SD DTT channels. I say "near" as CoreAVC is great expect for sport where it doesn't seem to cope with fast panning very well. Cyberlink 7.3 is smooth for the sport pans but has the occational judder. Ffdshow and MPC-HD work perfectly on Blurays (which I guess are all 1080p) but you cant use them for GBPVR live tv or recording playback (for H264 content). I found MPC and Graphedit/studio handy for looking at the effects of different filters although it's annoying I cant use MPC-HD or ffdshow within gbpvr other than for bluray.

[pBS]

here's a link for that demux...but it only works for stuff that *isn't* in-progress...
http://sourceforge.net/project/showfiles..._id=264678
get mpeg splitter..
sync issues i find are related to video not keeping up, usually because of software deinterlacing slowness..
[why i *always* use video card deinterlacing,never software...never a sync issue]

also a link to the ati tweak script page...lots of good info there on settings meanings..
http://home.comcast.net/~exdeus/ati-hd2x00/
it sounds like just the deinterlacing is goofed up and one of those settings may be the key...

those gigabyte drivers may well be 'fixed', tho sometimes they only have that manufaturers cards in there, so may need some editing if it doesn't recognize your card..

and always use the ati drv cleaner between driver installs, otherwise it keeps old settings in reg.
Note: the ati cat 8.11 only are good on xp, vista uses diff drivers and has diff problems so not sure which one is best for vista...
i'll never use vista so i skipped investigating..
[win 7 is soooo much better so far]

[BigMoose]

Forgot to say that I'm using the gigabyte 8.11 based drivers on Vista64. It's good enough that I dont want to break it by trying anything else. Is the driver cleaner available to download or do you mean running a de-install of the driver first?

I got the impression that windows7 was a nightmare as it picked its own H264 decoder (which was crap) and didn't let you chose anything else?

[pBS]

i'd stick with those drivers if they were working ok for you...[that's not an easy thing,64bit drivers can be a nightmare!] plus i know they fixed so much stuff at that time,i'd think most of it made it into vista as well..
the driver cleaner comes with the drivers,it's the "remove all" ati entry in add/remove programs part in control panel..
[or look for AtiCimUn.exe in ati unistall dir]
the manufaturer's drivers are definitely always worth a try, then the latest ati dl, then recommended versions from the web...
if it plays well in other players,then i'd stick with the drivers you have..

why 64bit? you don't need all of the mem with a htpc, it'll never use it..
and it makes everything a nightmare, with little benefit..

and i just meant win 7 as a general os vs. vista...
it just seems to not have the lag to *everything* that vista does...
feels more like xp than vista...but yea, the 264 thing sucks but i'm sure it'll be gotten around by somebody eventually, if they keep it in the final release...

otherwise, i'm stickin to XP....lol