dropping frames

[goose]

I have a problem when capturong from vhs. One tape works fine and the other starts dropping frames. But I'm not shanging any settings.

my system : duron 700@884
512 mb ram pc 100
40 + 20 gig
win xp for cpturing
haupage tv go
virtual dub

setings : avi uncomprest 25 bit rgb
352*288 for vcd
25 fsp for pal

I capture then convert to vcd with tmpeg , burn ,delete the files and defrag before capturing.
Why am I losing frames ??

thx

[Shabubu]

I know this may seem odd, but I wouldn't suggest an overclocked PC for capping, capture cards and progs rely very heavily on the system clock for there timings, and performance is worse if you overclock you processor.

[mijman]

Another obvious possibility that you seem to be overlooking is that the tape ITSELF is responsible for the droppped frames. I see this from time to time in my capturing "adventures," as my computer doesn't drop frames for ANY other reason.

[craby]

I have exactly this same problem. Last night I captured a video which was about 23 gigs, and I only had about 30 dropped frames. This morning, I went to do another and its dropping about 5 frames a second, even though I'm using exactly the same settings. I went back to the previous tape, and it does it with that one too.

I did a defrag, and disabled every single background application, but still no go. Even with sound off it does it.

Its very confusing. I'm running a p3 866 with 512 of pc133 and a seagate IV 60gig 7200rpm drive so I would expect my system is more than capable of capturing at pal vcd settings. I'm using my asus v8200 geforce 3 as the capture card and it obviously works as it did a great job with the other one.

Sigh. Any suggestions would be muchly appreciated. I was wondering if maybe its a problem with virtual dub?

regards,

[Ronin2]

This was also a problem I had when I used VirtualDub for capturing. I followed all the precautions, defrag, shutting down network, antivirus etc. One thing I noticed, if I deleted the first capture and did it a second time the number of dropped frames was less and third capture was even better. I have no explanation other than tape tensioning or temperature stabilizing.

I've since changed over to AVI_IO for the capture and VDub for processing and frameserving.

I hope I have helped, any opinions or comments welcome.

Regards,

Ronin2

[craby]

Hello,

I just discovered what the problem was, and I only found the error by pure chance.

I happened to notice that something had changed from last time after all. The WDM video capture driver had set itself back to a default ntsc setting. I'm capturing from pal video's. As soon as I changed it back to pal, my frame drops went from about 10 a second to 0.

This is possibly why so many other people have having seemingly unexplained problems, as there's no way from what I can see of identifying this through virtual dub. I only noticed it when I was attempting to record a test video through xp movie maker.

I hope this helps someone else.

regards,