[PD] background pics in pd/quicktime codecs in gem

[kurt stockman]

I've been very happy with mpeg 4 (divx codec on windows) !
about the keyframe issue >> when rendering try 'every frame is a keyframe' 

I get very good performance this way (mixing, scratching, texturing,...)

I do limit the movie dim to 320x240 and the gemwin dim to 800x600. 

hey, it's not broadcast quality but it's funky realtime this way!


kurt

-----Oorspronkelijk bericht-----
Van: pd-list-admin at iem.kug.ac.at
[mailto:pd-list-admin at iem.kug.ac.at]Namens chris clepper
Verzonden: vrijdag 15 november 2002 0:23
Aan: Orm Finnendahl
CC: PD-list at iem.kug.ac.at
Onderwerp: Re: [PD] background pics in pd/quicktime codecs in gem


>Hi all,
>
>2 questions:
>
>1. Is there a way to load bitmap images into a patcher as a background
>    image?

no idea how to do this, but it would be a nice thing to have.

>
>2. Using Gem with a Linux System I try to play back an Apple Quicktime
>    Movie. I get the following eror:

the quicktime4linux lib really doesn't handle most quicktime codecs. 
'rpza' or road pizza is the code for cinepak codec originally used by 
quicktime.  it's now mostly deprecated in favor of faster higher 
quality codecs.

i'm not sure why you would want to use mpeg2 with GEM as it's a 
really not a good choice for real-time use.   interframe compression 
kills frame rates, and try playing any mpeg backwards sometime.  on 
the other hand it's great for low bandwidth delivery.  there is a 
quicktime6 plugin that does mpeg2 conversion if you really want to go 
that way.

here are some good codecs for real-time video:
photo-jpeg - low bandwidth and low cpu usage
animation - if you are using RGB for processing then animation saves 
yuv->rgb conversion
DV - actually works quite well on faster machines

ok codecs:
motion-jpeg - large files and slow to decompress.  there are some 
cards that do hardware mjpeg
uncompressed - if you have the bandwidth (up to 36MB/sec) you can get 
decent performance

not so good:
mpeg1,2,4
sorenson 1,3
anything with keyframes

unfortunately you don't have a very good selection to choose from on 
linux.  i tried to get decent performance from quicktime4linux and 
was always fairly disappointed with the results.