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.
enrike