Florin Andrei wrote:
On Fri, 2005-09-09 at 19:08 +0900, Joe Friedrichsen wrote:
If comparisons haven't been made, then I should do some. Which are good
video types to test? What content do I want? I like tecoltd.com's choice
of fast motion, edges, and details. What types of video will show how
encoders differ?
I'd say, grab your camcorder, shoot a few different types of scenes
(lots of motion / no motion, lots of noise / no noise, lots of texture /
no texture) then transcode to DVD MPEG2.
A proper comparison is _very_hard_to_do_! No wonder you couldn't find
any. You must have an intimate knowledge of all config parameters of all
encoders you're testing, what are the effects of tweaking each
parameter, what are the cross-relations between them, etc.
Good luck, you'll need tons of it.
Anyway...
My way of converting DV (digital camcorder) to DVD, focused on image
quality and standards compliance:
http://www.transcoding.org/cgi-bin/transcode?DVtoDVD
Scroll half-way down until you find my HOWTO on that page. It's not
"very out of date", it's still pretty usable. Only the conv-dvd file
needs some small updates, see the attached file to this message.
I just sent an email to the person who maintains that page and asked for
permission to make updates to the HOWTO.
Thanks for your clarifying statements about the different connections
between libavcodec and ffmpeg, mencoder/mplayer, and transcode. I was so
used to thinking that each were separate utilities that when I started
finding the same library (libavcodec) being mentioned, my brain wouldn't
make room for a new way to look at the landscape. Your answers were helpful.
Incidentally, I'm primarily looking for a good encoder because I'm using
a DV camera to make short films and documentaries. Your script is a good
boost for me. Also, I appreciate your suggestions on how to begin
testing (I won't get too hardcore into it - I don't have the resources
to learn the frequency domain analysis and compression algorithms used
in mpeg2 encoding). Most likely, it'll be a qualitative answer for me.
Dik Takken wrote:
In my experience, doing proper preprocessing of video streams before
feeding them to the encoder makes _much_ more of a difference than
switching encoders. I like to use MJPEG Tools for encoding to DVD
format, because it includes some really good preprocessing tools.
I am planning to release a GUI frontend to MJPEGTools 1.7.0 which you
might like to use. It allows the user to interactively build and store
preprocessing pipelines that are optimized for whatever video source
you need to encode. It is targeted at encoding DV video files to DVD
compliant video and will be similar to my DVD authoring wizard that
was released some weeks ago:
http://kde-apps.org/content/show.php?content=27528
Great! I've looked at it and I like it a lot. Please post about the new
frontend when it's ready!
Thanks for your answers.
Joe
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