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Message |
Dennis
Guest
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 Posted:
Thu Oct 21, 2004 7:06 am Post subject:
Capture Resolution |
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I'm trying to capture VHS to move it
to DVD. I want to compare for myself
the difference in appearance between
resolutions so I captured about 10 mins
of film at 720x480 and the same 10 mins
at 352x480 using the ATI Multimedia Center
in mpg format.
I expected the file at 352 to be approximately half
the size of the 720 but its not-- they are both almost
exactly the same size. Shouldn't it be smaller?
If not, why wouldn't I ALWAYS use the higher
resolution?
Thanks,
Dennis
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Biz
Guest
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| Posted:
Thu Oct 21, 2004 7:36 am Post subject:
Re: Capture Resolution |
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"Dennis" <dhearn10@NOSPAMPLEASE.comcast.net> wrote in message
news:zeCdnc5rQchQuurcRVn-og@comcast.com...
| Quote: | I'm trying to capture VHS to move it
to DVD. I want to compare for myself
the difference in appearance between
resolutions so I captured about 10 mins
of film at 720x480 and the same 10 mins
at 352x480 using the ATI Multimedia Center
in mpg format.
I expected the file at 352 to be approximately half
the size of the 720 but its not-- they are both almost
exactly the same size. Shouldn't it be smaller?
If not, why wouldn't I ALWAYS use the higher
resolution?
Thanks,
Dennis
What were teh respective bitrates? 2000kb/s is 2000kb/s no matter what |
resolution you use. |
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Guest
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| Posted:
Fri Oct 22, 2004 4:05 pm Post subject:
Re: Capture Resolution |
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"Dennis" <dhearn10@NOSPAMPLEASE.comcast.net> wrote:
| Quote: | I'm trying to capture VHS to move it
to DVD. I want to compare for myself
the difference in appearance between
resolutions so I captured about 10 mins
of film at 720x480 and the same 10 mins
at 352x480 using the ATI Multimedia Center
in mpg format.
I expected the file at 352 to be approximately half
the size of the 720 but its not-- they are both almost
exactly the same size. Shouldn't it be smaller?
|
Bitrate and running time determine file size - resolution is not a
factor.
| Quote: | If not, why wouldn't I ALWAYS use the higher
resolution?
|
Lower resolutions do not require as high of a bitrate, so you can get
more running time on a DVD by using a lower resolution. 720x480 is
overkill for VHS anyway. |
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Dennis
Guest
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| Posted:
Sun Oct 24, 2004 3:13 am Post subject:
Re: Capture Resolution |
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| Quote: | Lower resolutions do not require as high of a bitrate, so you can get
more running time on a DVD by using a lower resolution. 720x480 is
overkill for VHS anyway
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I think this is what I missed- I should have reduced the bitrate in addition
to the lower resolution.
Thanks-
Dennis |
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Toshi1873
Guest
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| Posted:
Mon Oct 25, 2004 7:19 pm Post subject:
Re: Capture Resolution |
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In article <N5Kdnf-uXYI7eOfcRVn-gw@comcast.com>,
dhearn10@NOSPAMPLEASE.comcast.net says...
| Quote: |
Lower resolutions do not require as high of a bitrate, so you can get
more running time on a DVD by using a lower resolution. 720x480 is
overkill for VHS anyway
I think this is what I missed- I should have reduced the bitrate in addition
to the lower resolution.
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And you'll need to do some experimenting to figure out
what bitrate is going to work well for you. At a guess,
since you're using CBR.
4000kbps would probably be overkill for 352x480, unless
the encoder is really bad.
3000kbps should be great.
2000kbps is probably starting to push what the encoder
is capable of.
A lot of it depends on how clean your source material
is. A tape with a lot of noise requires a higher
bitrate (noise = more detail = more work for the
encoder).
If you're really trying to pack the maximum amount of
footage on a DVD, you'll definitely want to use AC3
instead of PCM for the audio (I've gone as low as
160kbps AC3, but 192kbps is probably a better minimum). |
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