Ron
Guest
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 Posted:
Thu Nov 04, 2004 11:35 am Post subject:
render/compression question |
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render question
I'm capturing in ATI's 8500DV using mp2 format - reasonably satisfied with
the expected quality of such (would really like to hear comments on the
Canopus AVDC-300 though).
However, I noticed in editing pre and post sections off of the captured
video, and then rendering what's left, in Mpeg Wizard (Womble) and Ulead
Video Studio 6 and 8, it takes awhile to render the new file. I seem to see
a slight difference in quality (loss) between either of the two applications
results, and the original, and am wondering why.
Are these two apps actually rendering the new video length by implementing
or inducing some sort of re-compression? Coming from a fairly extensive
audio and video background (analogue), I'd like to hear opinions. In digital
audio, I've not yet run into an editor that changes the compression (or
quality state) of the file unless you direct it to.
The quality is different between the captured and the edited/rendered video;
not a remarkable high loss of quality, but something's just not as it was
with the original captured file.
Thanks in advance for opinions.
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Guest
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| Posted:
Fri Nov 05, 2004 5:18 am Post subject:
Re: render/compression question |
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"Ron" <imagitek@hotmail.com> wrote:
| Quote: | render question
I'm capturing in ATI's 8500DV using mp2 format - reasonably satisfied with
the expected quality of such (would really like to hear comments on the
Canopus AVDC-300 though).
However, I noticed in editing pre and post sections off of the captured
video, and then rendering what's left, in Mpeg Wizard (Womble) and Ulead
Video Studio 6 and 8, it takes awhile to render the new file. I seem to see
a slight difference in quality (loss) between either of the two applications
results, and the original, and am wondering why.
Are these two apps actually rendering the new video length by implementing
or inducing some sort of re-compression? Coming from a fairly extensive
audio and video background (analogue), I'd like to hear opinions. In digital
audio, I've not yet run into an editor that changes the compression (or
quality state) of the file unless you direct it to.
The quality is different between the captured and the edited/rendered video;
not a remarkable high loss of quality, but something's just not as it was
with the original captured file.
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I'm not familiar with your hardware or software, but if you're
capturing in MPEG2 format and then editing it, it is likely that the
video is being re-encoded. MPEG formats are not well suited for
editing, and they do introduce some loss which will become
increasingly apparent with multiple generations of encoding.
I think the only good reason to capture in MPEG format is to save time
and effort; apart from that, there are only disadvantages. If you
want the best quality, capture using a good AVI codec like huffyuv (or
DV like the Canopus ADVC products use), then when you've done whatever
editing you need to do, use a good encoder like TMPGEnc (which can do
some basic editing as well) to encode the file in a DVD-compliant
format. |
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