[mgp-users 00782] Re: Problem with MagicPoint1.09 and mng-animations

[Michael Felsberg <mfe@isy.liu.se>]

I figured out what the problem was:

the mng-animation must not have more than 255 colors, must not be grayscale, 
must not contain a colormap, and one must not specify a quality level in 
convert. Hence, for gray value mpegs
convert -delay .. -colors 255 -colorspace GRAY movie.mpeg movie.mng
works
but either having -colors 256 or no colors option does not work.
The -type parameter should be avoided as well as -quality ..

I assume that there are problems with drawing the frames of the animation 
during playback for some specifications. E.g. -colors 256 gives a flashing 
still image showing the first frame and -type Grayscale gives white boxes. 
The effect of the quality parameter is not totally clear for me but it works 
fine if it is omitted.

For color mpeg omit the colorspace option.

I can send example mpeg and mng to anyone who is interested, but they are 
fairly large (2MB).

Michael

On Tuesday 29 January 2002 23:38, you wrote:
> From: Michael Felsberg <mfe@isy.liu.se>
> Subject: [mgp-users 00773] Problem with MagicPoint1.09 and mng-animations
> Date: Fri, 25 Jan 2002 10:15:42 +0100
> Message-ID: <>
>
> mfe> I tried MagicPoint1.09 and the snapshot from 21 Januar.  libmng is
> 1.0.0 mfe> (SuSE 7.3).
> mfe>
> mfe> The mng's were created with convert (ImageMagick) based on animated
> gifs mfe> (from gimp 1.0.2) and on mpeg (mpeg2decode), e.g.:
> mfe> convert movie.mpeg movie.mng
> mfe> which gives just the first frame of the animation in mgp.
> mfe>
> mfe> I also tried
> mfe> convert movie.mpeg +compress movie.mng
> mfe> which gives a white square
>
> If you don't mind, please send me your mng file.
> I would like to check it.
>
> Thanks,
> --
> Yoshifumi Nishida
> nishida@csl.sony.co.jp