Quantcast Bitrate question.. - digitalFAQ Forum
  #1  
10-29-2009, 10:26 PM
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I lost a lot of my notes because of some computer problems, and as you know, there's tons of things that I'm learning and doing...
I went to capture a video just now, and when I was setting up the bitrate for it, I went completely blank.

It's a video that is 1:57 minutes....so, if I remember right, in my WinTV (capturing program) any video that is under 2 hrs is -
Constant Bitrate, 15,000 Bitrate and 720x480 and audio of 256 (even though in TMPEG SoundPlayer I make the final one 384, is it ok to capture with 256)
Anything over 2 hrs is Variable bitrate....is this right?
I'm pretty sure that it is, I just want to double check.
Thanks
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  #2  
10-29-2009, 11:07 PM
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Or....would the bitrate for under a 2 hr video be...for example this 1 hr and 57 min video be CBR of 4700 as opposed to 15000? I know it's one or the other, I know you told me to use 15,000 as a bitrate for something, but I can't remember exactly what it was,,,
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  #3  
10-30-2009, 12:07 AM
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Another q I've meant to ask u, but keep forgetting to....with a master copy video, do you think it's necessary to restore the audio on it? Or, does it just basically depend on the video, even if it is a master copy?
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10-30-2009, 01:22 AM
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Your capture audio is MP2. If you can make it 384kbps or higher, go ahead and do it. Your captured audio is converted from MP2 to WAV, anyway, and then de-hissed and restored. After the audio is restored, we don't want to damage it from compression, as it's already somewhat touchy and easier to re-mess up. So a lighter 384k compression is what gets chosen. If there is a lot of room on the disc, sometimes I use 448k. But you're wanting to stick a lot of material onto a single disc, so I don't know if you have room for that 100k overhead.

The 15,000k for video capture is correct, for your recording project. You re-encode it to a small compression at higher quality in software (MainConcept), as compared to capturing at a lower bitrate. I would do all 15,000 captures at CBR.

Never do CBR 4700k. At 720x480, that would look like crap.
At 352x480, that would be overkill. Use VBR is you do 352x480 at 4700k video. That would maybe be for small videos, where you're not going to re-encode.

Pretty much all VHS tapes, including commercial release ones, have some degree of hiss or noise. Most everything needs to be filtered, unless you like to have "ssssssssssssssssssssss" sounds in the background of your audio. On today's modern sound systems often connected to nice HDTV's, it's incredibly easy to hear hiss. Some tapes are fine, however -- yes, it depends COMPLETELY on the tape and what you hear.

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10-30-2009, 07:01 AM
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"The 15,000k for video capture is correct, for your recording project. You re-encode it to a small compression at higher quality in software (MainConcept), as compared to capturing at a lower bitrate. I would do all 15,000 captures at CBR. "

That is with 720x480 setting as well, right?
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  #6  
10-30-2009, 07:05 AM
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Yes, 720x480

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  #7  
11-04-2009, 01:21 PM
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Ok, for all captures that I'm encoding, I'll be using 15,000 cbr.

However, In MC when I encode, for a video that is 2 hrs. or less, should I make the settings, cbr around 5000 or so?

And anything over 2 hrs is vbr? are both those correct?
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  #8  
11-04-2009, 01:34 PM
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Capturing 15000kbps, Hauppauge card, yes.

Re-encode in MainConcept MPEG Encoder:
Less than 2 hours, 352x480, CBR 5000kbps, yes.
More than 2 hours, VBR with proper bitrate to max out the space.

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  #9  
11-04-2009, 03:51 PM
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How about a video that run 2 hrs and 4 min...could I still use the CBR 5000 bitrate on that?
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  #10  
11-04-2009, 05:03 PM
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You could probably fit 2 hours and 10 minutes in at 5000kbps CBR, give or take. I'm sure 2 hours and 4 minutes would still be perfectly fine.

Remember that menus can take up a little overhead on the disc, but usually no more than 50-100MB even for semi-complicated menus.

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