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  #1  
02-02-2016, 07:42 PM
alewis alewis is offline
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Hoping for some advice regarding tape video capture.

My capture PC is based around an HP xw9400, ATI PCIe video card (6790 or 6970, can never remember which), and a Matrox RT.X2 (full fat version).

Source is an SVHS VCR, connected via component video.

I want to capture VHS - and possibly some DV cam tapes - to transfer to DVD. There may or may not be some editing/restoring involved.

I'm somewhat disappointed with the RTX2 as a 'capture' card; the only options for file capture are (from top of head) DV, DVCPro, Matrox MPEG-I. I understand I dont want to use DV (4:1:1 reduced colourspace). I tried a VHS tape using MPEG-I. A 1 hour capture was 5GB in size, even at 10MB/sec. And 10/mbit is the minimum capture rate. I'm pretty sure VHS doesnt need 10mb/sec - even broadcast quality video was 2mb/sec (wasn't it?).

Questions:

1. If I use S-VHS, I only get black and white video - and no idea why or how to fix this?

2. Is there any way to use other software to capture via the RTX2? Had a quick look at VirtualDub but it doesn't see any capture device. TMPGenc, perhaps? Or can I persuade Vdub to so so? Or something else?

3. For the tapes I need to 'restore', I should capture uncompressed video. The most I want to do at capture stage is crop/mask the picture to remove bottom picture tearing or ragged right hand image. Simply because its a step saved later, and why capture data I cant' fix and wont be working with... Can I capture uncompressed video with the RTX2?

4. Worst case scenario is the X2 is a bust for capture. My PC is wholly PCIe, what solution would you recommend? VCR->DV Cam-firewire->PC?

Many thanks, and I'll try to remember to upgrade membership this week!
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  #2  
02-02-2016, 08:50 PM
msgohan msgohan is offline
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Quote:
Originally Posted by alewis View Post
Source is an SVHS VCR, connected via component video.
Actually component (YPbPr = 3 cables), or composite?

Quote:
A 1 hour capture was 5GB in size, even at 10MB/sec. And 10/mbit is the minimum capture rate. I'm pretty sure VHS doesnt need 10mb/sec - even broadcast quality video was 2mb/sec (wasn't it?).
You're mixing up megabytes and megabits. 10MB/sec * 3600 sec = 36GB. And 2Mbps is ~1/4 DVD quality.

A capture straight to MPEG-2 I-frame at 10Mbps would be worse than DV quality (DV is 2.5x the bitrate using a similar compression scheme; just different colorspace).

Quote:
If I use S-VHS, I only get black and white video - and no idea why or how to fix this?
Since you said "use" and not "play back" I'm assuming you mean S-Video, not S-VHS tape. Are you using the Y/C breakout cable and connecting it to the correct input jacks?

Matrox RT.X2 breakout cable.PNG

Quote:
Is there any way to use other software to capture via the RTX2?
I don't think it provides uncompressed output over the PCIe bus, in which case no. If it provides a direct uncompressed display for delay-free live "Preview" purposes, maybe -- if you try really hard. To work well, it would need to use the regular Windows Driver Model (WDM).

Quote:
Can I capture uncompressed video with the RTX2?
See above.

Quote:
My PC is wholly PCIe, what solution would you recommend? VCR->DV Cam-firewire->PC?
Compression-wise, that would be worse than higher-bitrate MPEG-2 I-frame.


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