[PD] Video problems using GEM

Claire O'Connor oconnc26 at tcd.ie
Thu Apr 17 17:51:50 CEST 2014

Hi Chris,

Thanks for your help. Converting the videos to those formats definitely
helped. I am using Pure Data in a project which is attempting to create a
slideshow. I am also using pix_image in conjunction with pix_film for this
project and everytime I have a video playing and load a picture during that
time, the video playback slows down. Have you any ideas on how to prevent
this? I am using JPEGs taken on the same camera as mentioned above (Canon
Ixus 127 HS) and they are between 3MB and 6MB each. The most images I would
have banged to load at once is three. Here is some more information on
those images.

Any thoughts you might have would be a great help. Thank you!

On 17 April 2014 14:44, Chris Clepper <cgclepper at gmail.com> wrote:

> 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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