[PD] GEM error on latest pd extended with Ubuntu Gutsy

Roman Haefeli reduzierer at yahoo.de
Wed Oct 31 04:24:46 CET 2007

On Wed, 2007-10-31 at 03:29 +0100, Roman Haefeli wrote:
> On Tue, 2007-10-30 at 13:38 +0100, Thomas Mayer wrote:
> > Maybe the video is corrupt, have you tried transcoding the video with
> > mencoder or transcode?
> > 
> > Try
> > 
> > $ mencoder -ovc xvid -xvidencopts bitrate=800 -oac copy -o train.avi
> > train.mov
> > 
> > and load the film train.avi
> hi thomas
> maybe i missed something, but i don't quite see why you are suggesting
> to reencode the movie to avi-container with xvid codec. usually it is a
> bad thing to do, because xvid codec, that is quite heavy cpu-wise to
> decode (ok, on decent computers it is not that much an issue anymore),
> and - what is much more important - it is a so called interframe codec,
> which means, that many frames are dependent on each other. this
> basically means, that the codec is optimized to be played only forward
> and at 1x speed. playing at a different speed or backwards can either
> produce funny artefacts or not work at all. usually when using a video
> in gem, having high flexibility and low cpu cost is much more important
> than small file size. that is why so called intraframe codecs are rather
> recommended for this kind of task. 'intraframe' means, that each frame
> is encoded separately, which makes it very easy to access and render
> random frames. i think most supported intraframe codecs are 'jpeg',
> 'mjpeg' and 'dv'. 
> yo, i am not very much an expert in this field, so i might be not very
> precise in everything, but i hope i could give some idea, why generally
> you rather not want xvid as movie codec to be used in gem (although you
> are especially looking for funny effects).

argh, sorry for my english. i wanted to say:

excepting you are looking for funny effects.


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