Quantcast Recording Video: Big Files After the Capture?! - digitalFAQ.com Forums [Archives]
  #1  
10-11-2005, 01:32 PM
Prophecy604 Prophecy604 is offline
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Hi!

I have a Tr940 Hi8 HnadyCam with an S-Video output and I would like to know if its normal to have a 16gigs file (320X240 29FPS NTSC) for 1 hour video (not compressed). The quality is good.

My question is ...

With a better capture card would I have as big files after the capture or smaller files with better quality?

What card do you recommend me? I don't want Nvidia based card. Now I have a cheap card that I bought on Ebay for about 40$. Its only write Digital PC TV Capture on the box.

Thank you!

Steeve
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  #2  
10-11-2005, 01:40 PM
Dialhot Dialhot is offline
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Quote:
Originally Posted by Prophecy604
I would like to know if its normal to have a 16gigs file (320X240 29FPS NTSC) for 1 hour video (not compressed). The quality is good.
Yes it is. In non compressed (raw) mode, the size needed by a frame is width x height x 3 bytes. Here you have 29.970 frames / second, 3600 second in an hour...

Quote:
With a better capture card would I have as big files after the capture or smaller files with better quality?
Better card will capture in an higher resolution. As you can see above, in raw mode, the size increase with the resolution.
With good card you can probably also capture in DV format, that is a little bet compressed, but still need 30GB for one hour (in 720x480 pixels).
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  #3  
10-11-2005, 01:47 PM
Prophecy604 Prophecy604 is offline
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Ok! Thank you!

With DivX 5.0.5 (1 pass) I can lower the 16 gigs files to 1 gigs. Any way to reduce it more?

Do you think with a better card I would have the same quality as the 16gigs file but compressed?

With my card when I capture in 640 X 480...my computer lag. P3 800 896 sdram.

Merci DialHot!

steeve
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  #4  
10-11-2005, 02:54 PM
Dialhot Dialhot is offline
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Quote:
Originally Posted by Prophecy604
With DivX 5.0.5 (1 pass) I can lower the 16 gigs files to 1 gigs. Any way to reduce it more?
Of course but the more you reduce, the worst is your source !
There is no efficient compression codec that is also lossless.
1Gig for a 1hour long video it's okay, but do not go under that.


De rien
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  #5  
10-12-2005, 01:17 AM
Prophecy604 Prophecy604 is offline
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If the image quality on my Hi8 tape is optimal...will the quality is suposed to be like a minidv camera when I transfert it to my PC?

Possible to encode the 16 gigs avi source file directly in KDVD? Will this worth the time?

The capture program that we take can have effect on the final result?

What computer I would need to capture in 640 X 480 and more? I own a PIII 800Mhz 896 SD-Ram and it can't capture 640 X 480 without lagging.

thank you!

steeve
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  #6  
10-12-2005, 04:34 AM
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Quote:
Originally Posted by Prophecy604
If the image quality on my Hi8 tape is optimal...will the quality is suposed to be like a minidv camera when I transfert it to my PC?
No, it won't. DV is 720*480 and digital natively. A capture (means analog -> digital convertion) can't reach the same quality.

Quote:
Possible to encode the 16 gigs avi source file directly in KDVD? Will this worth the time?
Of course you can. You even should to...

Quote:
The capture program that we take can have effect on the final result?
It has effect of the frame loss.
But it's better to let people doing capture tu answer, because I never do
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  #7  
10-12-2005, 04:48 AM
Prophecy604 Prophecy604 is offline
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Quote:
Originally Posted by Dialhot
Quote:
Originally Posted by Prophecy604
If the image quality on my Hi8 tape is optimal...will the quality is suposed to be like a minidv camera when I transfert it to my PC?
No, it won't. DV is 720*480 and digital natively. A capture (means analog -> digital convertion) can't reach the same quality.
If I capture in 720 X 480 the quality will far away from MiniDV or just a bit less good?

Quote:
Originally Posted by Dialhot
Quote:
Possible to encode the 16 gigs avi source file directly in KDVD? Will this worth the time?
Of course you can. You even should to...
I will...! I'm better to convert it in mpeg2 and from there convert it in KDVD? With some of my DivX 6.0 encoded video I have better success to convert them in mpeg2 and after I convert them in WMV. Its better then convert the DivX 6.0 encoded video directly in WMV. Same with KDVD?

Steeve
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  #8  
10-12-2005, 06:20 AM
Prodater64 Prodater64 is offline
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Quote:
Originally Posted by Prophecy604
I will...! I'm better to convert it in mpeg2 and from there convert it in KDVD? With some of my DivX 6.0 encoded video I have better success to convert them in mpeg2 and after I convert them in WMV. Its better then convert the DivX 6.0 encoded video directly in WMV. Same with KDVD?
Steeve
If your capture card supports external codec do capture with huffyuv lossless codec (big files). Then convert straight to KDVD.
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  #9  
10-12-2005, 07:30 AM
Boulder Boulder is offline
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Prophecy604: KDVD is MPEG2. MPEG2 is the codec, KDVD specs contain the specific variables for MPEG2 codec. Basically it's using the notch matrix.

Capture with HuffYUV or some MJPEG codec (ffdshow includes one you can use). Whatever you do, capture in YUY2 colorspace. Then convert the captured avi file to your final format. Never do any intermediate encodes unless you use a lossless codec.
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10-12-2005, 07:49 AM
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Quote:
Originally Posted by Prophecy604
If I capture in 720 X 480 the quality will far away from MiniDV or just a bit less good?
As noone answer to this part, I do : this depend on the quality of the capture card. It can be anything between the two.
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  #11  
10-12-2005, 01:13 PM
Prophecy604 Prophecy604 is offline
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Thank you guys!

I will prolly change my computer to allow me to capture in more then 320 X 240. I don't think my capture card supports external codec. The quality is good when I listen (live) what is on my Hi8 tape via the capture card but as soon that I encode it in DivX 320 X 240 the quality drop.

steeve
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  #12  
10-13-2005, 01:37 AM
Prophecy604 Prophecy604 is offline
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I have a PIII 800Mhz / 896 Sd-Ram 333 mhz / Geforce MX 400 video card

What I need to capture in 720X480 (kdvd)?

A) A new CPU
B) More memory
C) A new video card
D) A new PC :P

A Pentium IV 3 Ghz / 512 DDR 400 Mhz / Geforce MX 400 would capture in 720X480 resolution?

Thank you guys!

Steeve
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  #13  
10-13-2005, 01:49 AM
Prodater64 Prodater64 is offline
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Quote:
Originally Posted by Prophecy604
I have a PIII 800Mhz / 896 Sd-Ram 333 mhz / Geforce MX 400 video card

What I need to capture in 720X480 (kdvd)?

A) A new CPU
B) More memory
C) A new video card
D) A new PC :P

A Pentium IV 3 Ghz / 512 DDR 400 Mhz / Geforce MX 400 would capture in 720X480 resolution?

Thank you guys!

Steeve
In this point i would ask also at one of our experts friends, that, please, explain what broadcasting or any other capture source is worth enough to capture at 720*480.
I seem to remember that analog tv broadcasting can be captured without any loss at 352 (288, 576?, i don't remember this well).
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  #14  
10-13-2005, 01:56 AM
Boulder Boulder is offline
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Quote:
Originally Posted by Prophecy604
I have a PIII 800Mhz / 896 Sd-Ram 333 mhz / Geforce MX 400 video card
You only need a new CPU but you probably must upgrade the whole PC. Although you should be able to use MJPEG for capturing at full resolution on your current system, use VirtualDub and turn off preview while capturing.
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  #15  
10-13-2005, 01:58 AM
Boulder Boulder is offline
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Quote:
Originally Posted by Prodater64
In this point i would ask also at one of our experts friends, that, please, explain what broadcasting or any other capture source is worth enough to capture at 720*480.
I seem to remember that analog tv broadcasting can be captured without any loss at 352 (288, 576?, i don't remember this well).
Any analog TV broadcast should be captured at the highest possible resolution. The exact resolution you should use depends on your capture card (the chip actually). PAL broadcasts are something over 700x576 and NTSC 640x480 I think.

Many capture cards sample at very high resolution and then scale down to the desired resolution, which is not good at all.
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  #16  
10-13-2005, 02:08 AM
Prophecy604 Prophecy604 is offline
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When I capture with virtualdub I can't create avi source more then 2048 megs.

Also, in the capture setting its write 15 FPS do I up it to 29.97 FPS?

I go in Video / Set customs format and I choose MJPG 720 X 480 and I got an error message ... "Error 418 - Format video non reconnu". ???

How the hell a 16 gigs / hours files can be compressed to be burned on a normal CD or DVD. I calculated that I can only enter 1h30 hours on a DVD...!! I would really need a KDVD tutorial like the KVCD one.

Thank you!

Steeve
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  #17  
10-13-2005, 02:23 AM
Boulder Boulder is offline
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You have to use segmented capturing, that is, VDub will split the capture into <2GB parts that you can combine in the Avisynth script.

You must capture at 29.97fps if you are an NTSC user.

Use YUY2 as the colorspace (it's in the Format menu option).

I strongly suggest that you read the Doom9 capture guide, it contains a lot of useful information about processing the capture. I'm also sure there's KDVD guides available as well on this site.
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  #18  
10-13-2005, 02:25 AM
Prophecy604 Prophecy604 is offline
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Quote:
Originally Posted by Boulder
I strongly suggest that you read the Doom9 capture guide, it contains a lot of useful information about processing the capture. I'm also sure there's KDVD guides available as well on this site.
Humm...where?
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  #19  
10-13-2005, 02:32 AM
Boulder Boulder is offline
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Uh, Mr. Google should be able to tell you, that's what he is for
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  #20  
10-13-2005, 02:39 AM
Prophecy604 Prophecy604 is offline
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Good.

http://www.doom9.org/?/capture/start.html (For those how read this post and need the link)
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