Strange problems capturing from SR-V101 with PVR-250
 

I've been doing some capturing with my JVC SR-101US, but I'm getting some strange effects in the videos.

Does anyone know what is wrong? I've tried 2 different s-video cables and a composite and I still have the same problem.

I'm not seeing anything unusual.

There is some very minor image latency in the videos, but that's a side effect of several areas:

• Noise reduction - Temporal NR parameters, to be specific
• MPEG encoding - The nature of GOPs, 4:2:0 chroma compression, and video compression in general

Watching it as a video, not frame by frame, I don't see anything odd.

I've added another image, 11 is mine and 12 is someone else's capture from the same video.

You should be able to see it now, it's like motion blur.

That doesn't really mean much. The tape itself could be defective -- I just finish handling a tape like that. Many 1980s video cameras had problems with ghosting images at record time, and that can happen with VCRs, too -- including the professional decks used to dub tapes (which can be transferred to copies made during the creation of distribution duplicates).

The only way to fairly compare it is to use the same tape in both workflows.

You can always try turning off all of the VCR's filters (EDIT mode, no TBC), but then that somewhat defeats the purpose of the VCR. In all likelihood the VCR is fixing a bad tape, so it's doing its job.

You'd also need to capture as an uncompressed or lossless AVI -- not MPEG. Or I-frame MPEG, and at a high bitrate.

I only gave one example, it has this weird effect on every video tape I've tried.

I used that example because I had something to compare it with.

I have a PVR-250 and I thought the best way to capture with this card is with WinTV which saves the files as MPEG.

This is one of those problems that's impossible to diagnose remotely.
The VCR may be defective.
The capture card may be defective.

The Hauppauge PVR-250 is an MPEG hardware card, and it's made for capturing MPEG files with WinTV.
You'd have to compare it to another video card entirely.

Or another VCR.

I have seen that chroma ghosting before. It was present on this demo Video-8 tape that came with my camcorder (towards the end in the commercial for the camera).

http://www.youtube.com/watch?v=lqMsR6K9Syc

Going frame by frame you can see a chroma "ghost" from the previous frame. I thought it was my hardware, but its actually the tape itself. I capture uncompressed, so it isn't MPEG artifacts.

I didn't notice this problem when I captured using my PAL VCR, so it must be the JVC that's defective :(

Come on guys, those are blended frames. I made a script for a problem like this, it was due to my capture settings. Btw, you should record to uncompressed AVI. I have a PVR as well, and yes there is a way to capture raw.
http://forum.doom9.org/showthread.php?t=158230

Btw, Virtualdub will show the image in Preview but offers no way to capture from the Preview pin. I even asked the author to add this feature so we could easily record from PVR cards in Virtualdub, but he refused.
http://forums.virtualdub.org/index.p...T&f=6&t=19558&

I can probably fix your video however it would just be easier to recapture as AVI. First step is to downlaod graphedit.
http://www.videohelp.com/tools/GraphEdit

Then it's almost like a drawing program, you add boxes and draw lines between them. Quite simple, except knowing where to find the boxes in a big list. It would be even easier if I had the resulting .grf file but I don't have one saved.

It's not blended frames, as only the chroma channel is blending. A blended frame blends the luma, too. This is an issue with temporal noise reduction, and that can be faulty circuity in a VCR or capture card.

But it can also be a bad signal on the tape.

AVI vs MPEG recording is really an issue of preference, dictated by needs and wants. I've gone over this before, but the capture guides are getting expansions right now.

Bad choice of terms - yes it's chroma only. I examined it further and it's ghosting over about 3 frames. However it decays quickly so I should be able to fix it.

Check for any type of chroma noise reduction features being on and turn them off. I'll see if I can fix it though.

My particular capture issue, was an issue with recording in YV12.
The pulldown pattern creates 3 progressive followed by 2 interlaced frames. Those interlaced frames contain chroma from two different film frames on every other line. If you record those interlaced frames in YV12, the chroma gets blended. Therefore the sign of the problem is blended chroma on two frames. MPEG2 is supposed to blend the lines of chroma per field, so this isn't normally on issue. I think I had checked some setting to record in YV12 as a capture setting, in which case a driver blended the chroma in the wrong way, taking the chroma from the whole frame as if it were progressive.

Anyhow it can be perfectly recontructed due to redundant information in pulldown.

It's hard to see if this problem is only on select phases of the cadence or in general. It would help if I had a capture of a brightly colored object moving horizontally.

I'm getting a strange pulldown pattern, it's about 16 frames/sec, how am I getting that?
Step through the first 30 frames, is this what you see?
0 clean 0
1 clean 0
2 clean 0
3 clean 0
4 clean 1a
5 clean 1b
6 clean 2a
7 clean 2b
8 clean 3
9 laced 3/4
10 clean 4
11 laced 4/5
12 clean 5
13 laced 5/6
14 clean 6
15 laced 6/7
16 clean 7
17 clean 8
18 clean 8
19 clean 9
20 clean 9
21 clean 10
22 clean 10
23 clean 11
24 laced 11/12
25 clean 12
26 laced 12/13
27 clean 13
28 clean 13
29 clean 13
30 laced 13/14

There's a way of looking at this that gives me 25fps, it looks like PAL->NTSC.
What standard is the tape? What standard(s) are the VCR?

I was just about to say something similar.
Based on IP address (which Site Staff can see), Bilge is in UK, so NTSC is not a native format.

I'm almost wondering if this is an SR-V10U or an SR-V10E --- U is NTSC, E is PAL.
The PAL VCR would play NTSC as quasi-NTSC, PAL-60, and would account for this ghosting of the image.

Please verify.

Edit:
Re-reading, this is actually an SR-V101US, the revision of the SR-V10U (same VCR, more or less, but in uglier case).
But verify anyway, just to appease my curiosity.

This could also be power-related ... maybe. (I've seen stranger.)

In the case of my tape, it was played back on a Sony CCD-TRV65 Hi-8 HandyCam with its built in TBC and DNR functions on. It was captured uncompressed YUY2 4:2:2. The source is definitely native 29.97fps with no pulldown. The chroma ghosting only lasted 1 frame and only on that segment of the tape (I went through most of the video and checked parts with abrupt scene changes). I quickly checked my other captures (both VHS and Video-8) and I haven't seen it, so its on that particular tape.

Must have been an editing issue. Haven't looked at it yet.

Wow thanks for all the help guys, I do indeed live in the UK. I imported the SR-V101US & I have bought NTSC tapes over the years.

I was wondering if it could be a power problem because I have to use a stepdown voltage converter.


I'll try and capture some more clips later today.

Do you have an NTSC dvd/bluray/media box?

Unfortunately no :( does anyone know of a good voltage converter that I could use?

I'm not 100% positive that this is a voltage conversion error -- but I have seen similar problems when using a 240V stepdown convert for making a PAL VCR work on North American 120V power standards (NTSC video area).

For me, ultimately it was unnecessary, as the specific VCR (JVC HR-S7965EK) has a worldwide power adapter inside the unit (110V-240V ~ 50Hz-60Hz). I didn't know this was the case until diagnosing the VCR playback quality problems, at which time I discovered the power rating. I just use a plug shape adapter these days. The power converter was just a wasted purchase of $15. Unfortunately, I don't think this will be an option for you.

Look for a non-cheap quality converter. I don't have any immediate advice on where to buy one in UK.

I found some caps from the same VCR http://forum.videohelp.com/threads/3...-JVC-SR-V101US

Someone mentioned that NR is done across several frames. Can you confirm that Digital R3 is off?

Also, even the cheap DVD players I buy in North America, can be set to output both PAL and NTSC. That's not the case with UK? Even one of my LCD TV's accepted PAL. It would just help a lot if you could record an NTSC test signal somehow :(

Can you cap a scene with a pan or some movement like cars down a road, which lasts several seconds, at least 4.
This is an interesting pattern, I'd like to figure it out :)

Yeh, I'll see what I can do ;)

Bit of an update, I bought a new step down convertor from amazon;

http://www.amazon.co.uk/Tacima-Stepd...328287&sr=8-12

And it's not changed anything :(

Now, I need to locate a replacement remote control as I didn't receive one when I bought the VCR. Does anyone know where I can find one, or if there are other remotes compatible with the SR-V101US?

I did find one on a US site last week but it was very expensive when including the shipping.

JVC S-VHS VCRs don't have model-specific remotes. Most of what you see online is a scam, as far as I'm concerned. They pretend JVC had model-specific remotes, and then try to ridiculously gouge you on the pricing. There's no need for that.

You want one of these:

• http://www.ebay.com/itm/JVC-LP20303-...item2316ae6bfd
• http://www.ebay.com/itm/JVC-Multi-Br...item19cb00f1a0
• http://www.ebay.com/itm/JVC-MBR-MULT...item43a8972329 (expensive!!!)

Look at the photo here: http://www.digitalfaq.com/forum/home...nu-remote.html
Any of those three style remotes will work.

Sorry to here about the voltage converter not working. We're not often wrong at this site, and it's frustrating when solutions turn out to be misses (a swing and a miss!). If it's not voltage, then I don't have any idea what the problem might be. That's not a fun error to troubleshoot. I feel bad for you. I hope somebody else can think of possible solutions as to what it could be.

That's a great help admin, thank you very much!

I'll have a play about with the settings when I recieve one, just to see if anything changes, if not I may have to hunt down another VCR :)


Thanks again

Today I thought I'd try and capture some of my PAL tapes using my JVC HR-J785 and I have found the same problems! :rolleyes:

Now I have hope that it isn't my VCR's, but could this be a problem with WinTV, drivers or more likely to be a faulty capture card?

I had an idea about this. Can you set the VCR to display a time counter and record some seconds of that. Since it's a known signal I can figure out the strange conversion giong on.

Sorry I never go back to you jmac698, but soon after my last post I found a PVR-500 on eBay for a few quid, but damn it had the same problem! And I just had enough of it, it was driving me mad.

But I have just borrowed a friends Pioneer DVD recorder and what do you know, it works :)

I'm still not convinced the PVR cards are to blame though. :confused: odd

I've moved the Pioneer discussion here: http://www.digitalfaq.com/forum/vide...dvr-560hx.html
Don't want to threadjack too much, veer off topic.