[PD] recording GEM output weird framerate

Marco Donnarumma devel at thesaddj.com
Mon Aug 9 12:40:54 CEST 2010

thanks for your fast reply!
I think I know how to use the object, but it seems it doesn't behave as it
should, or I am missing something.

I've been using pix_write with [auto 1( or in combination with pix_snap, and
my gemwin is set to 20.

The issue is that when ffmpeg build the movie out of the images sequence (at
20 fps), the resulting video is shorter then it should (i.e. 1 minute
instead of 3).
...the same happens when I use pix_record.

does anybody have an idea about it?



2010/8/9 Lazzaro Nicolò Ciccolella <ciccolix at tiscalinet.it>

>  Il 09/08/10 12.17, Marco Donnarumma ha scritto:
>  Hi all,
>> it's been a week now I'm struggling to record properly a GEM output,
>> reading archives and forums.
>> I have fairly complex audiovisual patch with multiple geos, four pix_snaps
>> to create motion blur effect for 1280x320 res, and data exchange through
>> local network.
>> However I can record in a really good quality using both pix_record or
>> pix_write.
>> The problem is the recorded video is faster than the actual one.
>> It doesn't matter if I record frames with pix_write and build a movie with
>> ffmpeg or I record a whole movie with pix_record, the resulting movie is
>> faster anyway.
>> (I can confirm it 100% as I also record audio at the same time, and it is
>> indeed longer)
>> This happens on a machine with ATI card, both in ubuntu jaunty and windows
>> with Pd-ext 42.5 rc 5.
>> What is even weirder is that if I load the recorded video into Pd with
>> pix_film it tells me the video has 115 fps, but with any other software fps
>> is between 20 and 30 (which I assume should be the proper framerate).
>> Anybody experienced the same?
>> What could I do about it?
> Hi,
> I only have experience with pix_write oby (it generate tif/png/jpeg image
> sequence) and it write at framerate specified on the gemwin oby. If you have
> [gemwin 50] you have 50 frame per second image sequnce, if you set [gemwin
> 25] you have 25 .....

Marco Donnarumma aka TheSAD
Independent New Media Arts Professional, Performer, Teacher - Edinburgh, UK

PORTFOLIO: http://marcodonnarumma.com
LAB: http://www.thesaddj.com | http://cntrl.sourceforge.net |
EVENT: http://www.liveperformersmeeting.net
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