[PD] recording GEM output weird framerate

cyrille henry ch at chnry.net
Mon Aug 9 14:53:25 CEST 2010



Le 09/08/2010 13:58, Marco Donnarumma a écrit :
> @ Lazzaro: yes I know, thanks for specifying, but the problem is that
> the duration of audio and video files I record don't match each other.
>
> @ Cirylle: ok, now maybe I understand.
> I'm actually already using a similar abstraction of yours to monitor fps :)
> My patch is completely automatic, it's a sonification/visualization of
> large amount of data, thus I just press a toggle to start it.
>
> So:
> if while recording the fps monitor shows 10fps, it means that also
> pix_write will record only 10 frames per second and _not_ 20 as I stated
> in gemwin, is that correct?
no, it will take 2 min to record 1min of video at 20fps.

>
> I was probably wrong assuming that whatever fps is stated in gemwin will
> be the recorded fps, even though the machine can't reproduce it in
> real-time.
>
> Ok, so, if I can only record at 10 fps, what do you suggest to finally
> have a recorded video with a decent framerate? (apart from changing
> machine...)
waite longer...
> I guess I could use ffmpeg to double the framerate, but the video might
> be jittery...
no, the video will be perfect, since everything is done with pd time.
pd time is no more real time, but that just a question of cpu/gpu. everything else should be exactly the same.

c

>
>
> M
>
>
>
>
> 2010/8/9 cyrille henry <ch at chnry.net <mailto:ch at chnry.net>>
>
>     here is a simple abstraction that output the real rendering frequency.
>     it help a lot to track this kind of problem.
>     c
>
>
>     Le 09/08/2010 13:02, Lazzaro Nicolò Ciccolella a écrit :
>
>           Il 09/08/10 12.26, Lazzaro Nicolò Ciccolella ha scritto:
>
>             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.
>
>         Hi, apologize me if it is a dumb answer, but if you apply very
>         intensive
>         motion bur and other stuf in your patch the speed of what you see in
>         your gem box will be very slow. The sequence of images that is
>         generated
>         will necessarily faster than what you see when the patch is running.
>
>
>
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>
>
> --
> Marco Donnarumma aka TheSAD
> Independent New Media Arts Professional, Performer, Teacher - Edinburgh, UK
>
>
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