Jumpy capture playback

[OleJuul]

When i capture a mjpeg at high-rez, and plays it back it is a very jumpy (one or two lines vertical). However when i convert to mpeg-2 or asf, the problem is gone.

Does anybody else have this problem?

Please help.

[The Sandman]

OleJuul,

Try the new 1.52.033 VideoTools Drivers ... they fixed this problem.

[OleJuul]

Thanks, but i've already got the latest drivers. I made a 'format c:', installed windows and the new drivers but that didn't solve my problem.

Does anybody know this problem with jumpy playback?

[This_Idiot]

What hard drive configuration are you using ?

[Captain Marvel]

Direct X version?

[OleJuul]

I've got a complete new system, P500e, Aopen AX63pro motherboard, Maxtor Diamondmax 20 gb harddrive, G400 32mb dh, Windows 98, direct X 7.0, latest matroxdrivers.

It seems that the problem occurs only when playing at default window-size or bigger (at full screen as well).

Thanks for your help.

[OleJuul]

By jumpy playback i dont mean 'jumpy as playback with missing frames' but the vidceo on the screen is jumping up and down every frame one or two pixel-lines.

[This_Idiot]

Are we talking about a one HD system here ? If so, that will probably account for the problem

[OleJuul]

Thanks for your answers.

I only have one harddisk, and capture works perfect (~1 dropped frame every 3 min). My only problem is that the picture captured doesn't seem still (it jumps up and down fast) on the screen when playing back.

What would i want to use another harddisk for????

[This_Idiot]

"What would i want to use another harddisk for????" ??????

Errrmm..... How much research have you actually done ? Seems to me that I've been preaching for the last 2 years and it's a bit like casting pearls before swine. Meaning that no-one seems to bother reading.

In very simple terms, if you have one HD it is being used by Windows itself in a number of ways (swap files, virtual memory etc). by the application itself (code caching, swapping etc) and the fact that you are trying to stream 3+Mb/S uninterupted from the same drive. It's a bloody miracle that it captures in the first place, and hardly a surprise that it won't play back. This isn't a sudden revelation, it's a basic tenet of video processing.

[Elie]

I agree with "This_Idiot",
GET ANOTHER DRIVE!!!
And set it up on the secondary IDE channel as Master, enable DMA and your in business.

Now regarding your image, are you playing back from Ulead, if so the field order might be wrong. Try changing it to Field order B which is what RR-G (Marvel G400) supports.


Regards,
Elie

[This message has been edited by Elie (edited 15 February 2000).]

[Willem]

>When i capture a mjpeg at high-rez, and
plays it back it is a very jumpy (one or
two lines vertical). However when i convert to mpeg-2
>or asf, the problem is gone.

I recently went through a problem, which sounds exactly the same: the fields were interlaced incorrectly in recording. Mpeg-2 and asf are OK, because the compression presumingly takes place frame-based (progressive). In these cases the vertical jitter is compressed into vertical blur. I guess on your PC monitor the picture is also OK, because it has progressive scan.

Try to get some MJPEG clips which are known to be OK, or convert some still images into MJPEG. They you know if your problem is in playback or recording.

I got Video Tools 1.52.033 (04 Feb 00) one week ago, and now my problem is gone. Display driver is 5.41.008. Double check that you really have Vidtools 1.52.033.

Willem

Ps. I suppose you have RRG and use PAL format.

[This_Idiot]

My bark is worse than my bite, honest !

Really, 2 drives is the way to go. Over and above that, there can be playback problems dependent on driver revisions and hardware (DC30+ is fairly finicky about the WMP version as an example). The G400 Marvel under the original drivers did sometimes show short bursts of frame inversion during very fast motion or high colour density (or a combination of both). This is supposed to have been fixed in the latest driver release but I haven't had a chance to try it yet (damned OS needs rebuilding again and I've been putting it off since it disrupts my email and online services so much). Now what I really need is another machine.....

[OleJuul]

Thanks for your helpes everyone.

This_Idiot: I didn't mean to be harsh, I love this forum, and I appreciate Your help very much. You are the light in the darkness of matroxdrivers. Thanks. (And I will try to borrow another harddisk.)

It seems that my problem is that interlacing is incorrect in mjpeg-recording. I'll try to format c: and reinstall the drivers.

Any other suggestions is very welcome.