[PD] Video problems using GEM

Chris Clepper cgclepper at gmail.com
Thu Apr 17 15:44:51 CEST 2014

The issue is with the h.264 codec.  On the Mac, compress them as 'Apple
Intermediate Codec' or ProRes (which comes with what's left of Final Cut
'Pro').  The files will be much larger in size on the drive but play back
much better.  When I wrote the OSX pix_film/movie code long ago, it was
only intended to play back intraframe codecs like the JPEG based ones and
not MPEG which are consumer delivery formats.

You should also set the gemwin to render at least 30 frames per second and
for smoothest playback use 60fps which is the refresh rate of an LCD.  I
think the default is still 15 or 20fps?

On Thu, Apr 17, 2014 at 7:11 AM, Claire O'Connor <oconnc26 at tcd.ie> wrote:

> Hi,
> I am currently working on a project which uses films with GEM. However,
> the films are very glitchy and play very slowly when they load up. I was
> wondering if anyone knew anything about how to fix this problem?
> The videos used were taken on a Canon Ixus 127 HS and last between 10 and
> 15 seconds. They are .MOV files and I even tried exporting them as smaller
> files but it didn't change their glitchiness. Here is an example of the
> file before and after the export with the original file being 80.8MB and
> the exported file being 5.9MB. Even with a drastic change in size, the
> difference in playback did not change much at all.
> Any thoughts and ideas welcome. Thanks!
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