On Mon, 13 Dec 2004, Steven M. Schultz wrote:
Keep in mind as well that for MJPEG, if you crank the quality of the recording up quite high, you'll also need a speedy hard drive to...
Yep - and I think that (more than the speed of the cpu) is what is causing problems for Dik.
What I see when running 'top' is that the user CPU usage is about 90% and system usage 10%. This happens when I capture at 640x480 or higher resolution. I only get 100% perfect captures at 512x384 and below.
DV is a flat ~12GB/hr. Now some have mentioned that as a shortcoming
("you don't get to select the quality") - but it's a feature to me.
You can always degrade the image later :-)
I would think that, since 12GB/hr is not exceptionally large, DV is still a bit of a space/quality compromise compared to MJPEG. This video format is not designed with video editing in mind, rather storage. MJPEG on the other hand is designed for video editing, not for storage. It's way too big for that. But maybe I'm wrong and the newer DV compression technology also beats MJPEG quality wise.
Another "feature" (which I've used fairly often) of DV is the fixed
record size - for "NTSC" the DV records are 120000 bytes and "PAL
144000 bytes. You can use "dd" as a simple/crude editor (and with
'locked audio' - one of the benefits of the Canopus product line) you
don't have to worry about slicing thru an audio sample.
Wow. This sounds *very* interesting. I was already trying to find out how to generate SMIL files from a script in order to use the SMIL utils to do simple cut/paste operations. I want to be able to do as much as possible without needing GUI apps like Kino.
Could you please direct me to some more information about the DV format that can be useful when writing DV editing scripts?
Can the PVR250, etc handle external devices such as a VCR? If so
that would be a good approache, but if the goal is to convert
old tapes to DVD then something like the Canopus unit would be a
very good choice.
I want to edit the video after capture, so an MPEG2 capture card is not an option. The image quality is too low.
Cheers, Steven Schultz
------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://productguide.itmanagersjournal.com/ _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
-----------------------------------------------------------------
-------------------------------------------------------
SF email is sponsored by - The IT Product Guide
Read honest & candid reviews on hundreds of IT Products from real users.
Discover which products truly live up to the hype. Start reading now. http://productguide.itmanagersjournal.com/
_______________________________________________
Mjpeg-users mailing list
[EMAIL PROTECTED]
https://lists.sourceforge.net/lists/listinfo/mjpeg-users
