[PD] 3gp videos with GEM on windows

altern altern2 at gmail.com
Mon Jun 9 14:37:02 CEST 2008

Roman Haefeli(e)k dio:
> On Mon, 2008-06-09 at 11:57 +0200, altern wrote:
>> Hi
>> I am using 3gp video with GEM on windows and linux. Under windows XP on 
>> some machines pix_film does not return the right video length in frames, 
>> it returns 1, testing with same video and patches in another machine 
>> returns the right length. Does this sound like some Windows issue? maybe 
>> some codec that needs to be installed? I need to find a format for video 
>> that works fine crossplatform.
> i don't think, that it's the best idea to use a format like 3gp for use
> with Gem. the goals of the 3gp format and working with video in Gem
> usually are quite different: 3gp is meant to be a suitable videoformat
> for small devices with only low resolution and high compression (it uses
> mainly h.263 and h.264 as video codecs), whereas usually with Gem file
> size is less important than for instance a fast codec and easy random
> access to frames. codecs with highly optimized compression usually work
> only when playing forward at single speed because of certain frametypes
> that rely on previous and future frames (interframe compression). i
> think it is best to not use such a codec when used in Gem, but rather an
> intraframe compression based codec, whereas each frame is compressed
> separately. from my experience the quicktime mov format with mjpeg
> (motion jpeg) works quite well and doesn't have too much cpu overhead.
> probably other people have other suggestions. on windows, avi format
> with dv codec might be running well (so you don't need to install
> quicktime). 

thanks for the tips! i dont know much about video compressions so it is 
very useful.


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