[PD] Video problems using GEM

John Harrison john.harrison at alum.mit.edu
Thu Apr 17 18:16:25 CEST 2014

I wonder if it would work better if you ran 2 Pd instances, loaded the pics
in one and ran the movie in the other, then shared the pics to the movie
instance with [pix_share_read] and [pix_share_write]?

On Thu, Apr 17, 2014 at 10:51 AM, Claire O'Connor <oconnc26 at tcd.ie> wrote:

> 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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