comp.lang.idl-pvwave archive: archive

Home » Public Forums » archive » Re: mpeg quality

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: mpeg quality [message #39132 is a reply to message #39126]

Tue, 20 April 2004 20:44

Kenneth P. Bowman
Messages: 585
Registered: May 2000

Senior Member

In article <1Zbhc.1597$Ua5.1269400@monger.newsread.com>,
"David Jackson" <jacksond@dickinson.edu> wrote:

> Sorry if this has been asked before, but does anyone know how to improve the
> quality of an mpeg written from IDL's Xinteranimate command. I tried
> changing mpg_quality and mpg_bitrate but I always got a file that was
> exactly the same size and quality. I must be doing something silly.

Because MPEG was mainly designed to handle "photographs", I have never
liked what it does to scientific graphs (line graphs, in particular).
I find that it is better to TVRD each frame and then write the image
to a file (I prefer PNGs, but there are other options ... see WRITE_IMAGE).
Then use a utility to convert the images to a movie using a codec that
is better suited for graphics (e.g, lossless). On the Mac I use
GraphicConverter (shareware) with the "Animation" codec. QuickTime Pro will
also do the conversion, I believe. QuickTime Pro is available for Windows.
Other readers can provide other suggestions.

Ken Bowman

Report message to a moderator

[Message index]

		Re: mpeg quality By: DPJ on Sat, 24 April 2004 16:18
		Re: mpeg quality By: Mark Hadfield on Thu, 22 April 2004 14:49
		Re: mpeg quality By: Haje Korth on Thu, 22 April 2004 04:44
		Re: mpeg quality By: Haje Korth on Thu, 22 April 2004 04:49
		Re: mpeg quality By: Miguel Angel Cordoba on Thu, 22 April 2004 02:16
		Re: mpeg quality By: Yunxiang Zhang on Wed, 21 April 2004 23:31
		Re: mpeg quality By: Mark Hadfield on Wed, 21 April 2004 19:48
		Re: mpeg quality By: Mark Hadfield on Wed, 21 April 2004 19:18
		Re: mpeg quality By: Haje Korth on Wed, 21 April 2004 09:57
		Re: mpeg quality By: Kenneth P. Bowman on Tue, 20 April 2004 20:44
		Re: mpeg quality By: Rick Towler on Mon, 26 April 2004 10:47

Previous Topic:	IDLcomIDispatch question (newbie alert!)
Next Topic:	Re: simplify a polyline?

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 18:06:19 PDT 2025

Total time taken to generate the page: 0.00267 seconds