Captured video real sluggish and jerky after conversion?
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 |
Re: Just a curious question...
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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 |
Re: Just a curious question...
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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 :). |
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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Jim |
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-kwag |
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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) :roll: Jim |
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-kwag |
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Jim |
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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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 :D . 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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