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01-04-2003, 02:26 AM
joseversion1 joseversion1 is offline
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I was thinking of capturing video at 740x480 at 4,000 kbits/s so I can put a few tv shows per DVD-R. I'm gonna use TMPG just to cut out the commercials and keep the quality the same.

Now my problem is when I did a few tests capture at that quality, it was running real sluggish and jerky. I have a 30gb 5400 rpm hard drive and I've read that the type of hard drive you use to capture video plays a part in the playback of the video. Is this true and should I pick up a new 7200 rpm hard drive? Or is it even worth it to capture video at that high of a resolution and I get away with a smaller reesolution and will look good? Any opionions and input welcome..

::I know this is probably a question for vcdhelp.com or elsewhere, but everyone here has been very helpful and provided me with a ton of information in answering everyone's questions...just thought I'd ask::

thanks!
JV1
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01-04-2003, 05:31 PM
jamesp jamesp is offline
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Quote:
Originally Posted by joseversion1
I was thinking of capturing video at 740x480 at 4,000 kbits/s so I can put a few tv shows per DVD-R. I'm gonna use TMPG just to cut out the commercials and keep the quality the same.

Now my problem is when I did a few tests capture at that quality, it was running real sluggish and jerky. I have a 30gb 5400 rpm hard drive and I've read that the type of hard drive you use to capture video plays a part in the playback of the video. Is this true and should I pick up a new 7200 rpm hard drive? Or is it even worth it to capture video at that high of a resolution and I get away with a smaller reesolution and will look good? Any opionions and input welcome..

::I know this is probably a question for vcdhelp.com or elsewhere, but everyone here has been very helpful and provided me with a ton of information in answering everyone's questions...just thought I'd ask::

thanks!
JV1
Going for a 7200 is not a bad idea at all - the drives are quite cheap. You don't say what Capture Card you are using or what software. It sounds like you are using WINDVR or PowerVCR and you're probably getting frame drops.

If your using a Bt878 based card (Wintv etc) try capturing using a program called AVI_IO using the PICVideo MJPEG compression codec set at compression level 18. You don't need a fast hardrive for this at all and the results are suprisingly good. Load the captured AVI files into TMPEG (put them into AVISynth first and do some temporal smoothing) and encode using your favourite KVCD template! Nice and Easy. However, if you get a 7200 drive, use the HUFFYUV codec instead. This is lossless but gives huge files!

Jim
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01-04-2003, 06:13 PM
SansGrip SansGrip is offline
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Quote:
Originally Posted by joseversion1
I was thinking of capturing video at 740x480 at 4,000 kbits/s so I can put a few tv shows per DVD-R.
Capturing at 720x480 puts quite a strain on both the HD and the CPU. You'll need an HD with good sustained throughput and not just fast bursts, so 7200rpm is a very good idea. This is especially true if you're planning on using a high bitrate codec such as high-quality MJPEG (set to 19 or 20) or Huffy. Also make sure you keep your capture drive defragged and use a dedicated partition if you can.

Personally I capture with VirtualDub_Sync, which is able to gracefully handle any dropped frames by tweaking the audio sampling rate slightly. This way the audio stays in sync even if you do drop some frames. The other benefit is you can see when frames are being dropped.

Bear in mind that capturing at 720x480 might be overkill unless you're taking it from a high-resolution source such as HDTV. Regular digital TV is generally broadcast in half D1, especially these days where it's obligatory for a content provider to carry hundreds and hundreds of channels no-one ever watches just so they have "more" than their competitors. As for analog TV, you won't get much benefit going over 352 pixels horizontally because of the bandwidth constraints in the video signal.

Try capturing the same material (i.e. wait for a repeat of something) using 720x480 and 352x480. I think you'll find that the difference is barely noticible, but the capture files will be significantly smaller and processing will be quicker too.

I might be completely wrong, but I've never been able to tell the difference between a 720x480 capture and a 352x480 capture when they're encoded .
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01-04-2003, 07:57 PM
joseversion1 joseversion1 is offline
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Awesome, thanks for the info. I tried captring some stuff at 352x480 and it seems to run well vs. the 740x480. So I think I'm going to keep it at that. Thank you very much for the info, I appreciate it!

But since you mentioned using Virtualdub Sync, I wanted to give it a shot. So are there any settings that you recommend because I do use WinDVR (using an Xtasy Everything 5564) so I'm only used to capturing in mpeg format. Any settings you recommend for AVI?

Thanks again!

JV1
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01-04-2003, 08:14 PM
SansGrip SansGrip is offline
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Quote:
Originally Posted by joseversion1
Any settings you recommend for AVI?
I use MJPEG at a quality level of 18-20 (depending on the length of the capture). Aside from that, there's lots of settings in VirtualDub_Sync to play with, but none of them are really that critical.
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01-05-2003, 01:12 PM
jamesp jamesp is offline
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Quote:
Originally Posted by SansGrip
Quote:
Originally Posted by joseversion1
Any settings you recommend for AVI?
I use MJPEG at a quality level of 18-20 (depending on the length of the capture). Aside from that, there's lots of settings in VirtualDub_Sync to play with, but none of them are really that critical.
Good luck with Virtualdub_sync. It doesn't work at all on my system with the BTWincap drivers . However, I've just downloaded a new version of IuVCR (came out yesterday) and it looks superb! Just done a capture for 2 hours using its realtime cropping and the Descaler realtime deinterlace plugin and it remained in sync for the whole capture without one dropped frame!

Jim
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01-05-2003, 01:31 PM
kwag kwag is offline
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Quote:
Originally Posted by jamesp
However, I've just downloaded a new version of IuVCR (came out yesterday) and it looks superb! Just done a capture for 2 hours using its realtime cropping and the Descaler realtime deinterlace plugin and it remained in sync for the whole capture without one dropped frame!

Jim
I have to try that program again . I've always used VirtualDub_Sync, and I drop maybe 8 or 10 frames in a 2 hour capture, which is not bad

-kwag
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01-05-2003, 01:36 PM
jamesp jamesp is offline
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Quote:
Originally Posted by kwag
Quote:
Originally Posted by jamesp
However, I've just downloaded a new version of IuVCR (came out yesterday) and it looks superb! Just done a capture for 2 hours using its realtime cropping and the Descaler realtime deinterlace plugin and it remained in sync for the whole capture without one dropped frame!

Jim
I have to try that program again . I've always used VirtualDub_Sync, and I drop maybe 8 or 10 frames in a 2 hour capture, which is not bad

-kwag
I get that with AVI_IO, presumably because its VFW based and not WDM (like virtualdub_sync). The realtime filters in IuVCR really rock, and it likes to carry on capturing even if your using your pc quite heavily.

BTW, if you do try it again and you're using the BTWincap drivers, make sure you tick the 'Smart Tee for Preview' option. Not having it ticked makes the PC crash quite nastily (presumably because BTWincap can't handle overlay)

Jim
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01-05-2003, 01:43 PM
kwag kwag is offline
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Quote:
Originally Posted by jamesp
The realtime filters in IuVCR really rock, and it likes to carry on capturing even if your using your pc quite heavily.
If it's using some of dscaler.org's stuff, then that's heavy stuff . dscaler really rocks
Quote:

BTW, if you do try it again and you're using the BTWincap drivers, make sure you tick the 'Smart Tee for Preview' option. Not having it ticked makes the PC crash quite nastily (presumably because BTWincap can't handle overlay)

Jim
Thanks for that tip Jim

-kwag
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01-05-2003, 01:50 PM
jamesp jamesp is offline
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Quote:
Originally Posted by kwag
Quote:
Originally Posted by jamesp
The realtime filters in IuVCR really rock, and it likes to carry on capturing even if your using your pc quite heavily.
If it's using some of dscaler.org's stuff, then that's heavy stuff . dscaler really rocks
Quote:

BTW, if you do try it again and you're using the BTWincap drivers, make sure you tick the 'Smart Tee for Preview' option. Not having it ticked makes the PC crash quite nastily (presumably because BTWincap can't handle overlay)

Jim
Thanks for that tip Jim

-kwag
It doesn't use descaler stuff directly, but you can download the Descaler Directshow plugin and use that!

Jim
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01-05-2003, 07:06 PM
joseversion1 joseversion1 is offline
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Ok, thank you everyone for helping out with my question and I've started using Virtual Sync to capture and I definately feel I'm on the right track to capture the way I want. The first time I captured (with mjpeg compression), everything looked great, then after a while the audio became out of sync everytime. I defragged my partition that I use for capturing but still had the problem. Then I tried some other avi capture programs like freevcr and uiVCR but I'm still getting out of sync audio. Any idea what might be causing this?

Thanks!
JV1
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  #12  
01-06-2003, 02:47 AM
jamesp jamesp is offline
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Quote:
Originally Posted by joseversion1
Ok, thank you everyone for helping out with my question and I've started using Virtual Sync to capture and I definately feel I'm on the right track to capture the way I want. The first time I captured (with mjpeg compression), everything looked great, then after a while the audio became out of sync everytime. I defragged my partition that I use for capturing but still had the problem. Then I tried some other avi capture programs like freevcr and uiVCR but I'm still getting out of sync audio. Any idea what might be causing this?

Thanks!
JV1
Thats exactly what i got with it. I'm aso getting it with IuVCR now after 1 hours capture. I'm trying another WDM based program called VirtualVCR that uses the resample audio principle (although you have to tell it to do this when you set the program up) ans it looks hopeful, and this program also lets you use Directshow filters as well. I'll let yu know if it works for me.

If you havn't tried it, i do thoroughly recommend trying AVI_IO : http://www.nct.ch/multimedia/avi_io/ . Its the only program I have used which seems to keep 100% sync with Audio and Video. It does drop frames to do this, but they never seem noticable to me and the odd dropped frame is better than out of sync audio . The reason why i'm trying other WDM programs is i really want realtime deinterlacing and croping! However, it looks like i'll always be going back to AVI_IO.

Jim
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