Forums > Jitter

Which codec for screening ?


f.e
February 28, 2008 | 10:21 am

Hello,

We’re using photo-jpeg codec (medium quality, without sound, 720×576,
25fps) movie files and it’s depressingly stuttering. Our machines (OSX)
are monster workstations and i wonder where’s the problem. When we play
our files using quicktime, it’s perfect. In jitter, it’s not acceptable.
Why ?

Which is the best codec we have to use to get a smooth, high quality
screening ?

f.e

ps: latest jitter, video editing macintosh workstations, something
called "blackmagic video output" to go to the video projectors


f.e chanfrault | aka | personal computer music
>>>>>>> http://www.personal-computer-music.com
>>>>>>> |sublime music for a desperate people|


February 28, 2008 | 3:42 pm

are you displaying your video in openGL ?
did you try Vade’s optimization patches ?

http://abstrakt.vade.info/?p=147

i had issues with heavy files ( above 1gb no matter dimensions/lentgh ), now i try to stay under 1Gb, even on powerfull machines .
i also separate the actual video process from the control , i now do applications for the video displaying engine and keep a patch for the controls , using udp to communicate between two.

"loadram" can help but jitter has a 2gb limit :(

if you plan to just broadcast direct to window can bethe solution for playing heavy files , try this patch if it is of any help :

#P window setfont "Sans Serif" 9.;
#P window linecount 1;
#P message 66 129 29 196617 stop;
#P message 32 129 33 196617 start;
#P newex 402 213 29 196617 t b l;
#P window setfont "Sans Serif" 10.;
#P newex 336 233 34 196618 sel 1;
#P newex 429 255 70 196618 prepend dim;
#P newex 351 328 218 196618 jit.window bob @size 640 480 @noaccel 1;
#P message 336 257 78 196618 getmovie_dim;
#P message 112 45 31 196618 read;
#P newex 284 210 62 196618 unpack s 0;
#P newex 284 182 117 196618 route read movie_dim;
#P newex 112 159 182 196618 jit.qt.movie @window bob @adapt 1;
#P message 143 113 66 196618 window bob;
#P connect 4 0 1 0;
#P connect 0 0 1 0;
#P fasten 5 0 1 0 341 290 531 290 531 146 117 146;
#P fasten 7 0 1 0 434 278 509 278 509 153 117 153;
#P fasten 10 0 1 0 37 151 117 151;
#P fasten 11 0 1 0 71 151 117 151;
#P fasten 9 0 0 0 407 239 465 239 465 87 148 87;
#P connect 1 1 2 0;
#P connect 2 0 3 0;
#P connect 3 1 8 0;
#P connect 8 0 5 0;
#P connect 2 1 9 0;
#P connect 9 1 7 0;
#P window clipboard copycount 12;

Quote: f.e wrote on Thu, 28 February 2008 11:21
—————————————————-
> Hello,
>
> We’re using photo-jpeg codec (medium quality, without sound, 720×576,
> 25fps) movie files and it’s depressingly stuttering. Our machines (OSX)
> are monster workstations and i wonder where’s the problem. When we play
> our files using quicktime, it’s perfect. In jitter, it’s not acceptable.
> Why ?
>
> Which is the best codec we have to use to get a smooth, high quality
> screening ?
>
> f.e
>
>
> ps: latest jitter, video editing macintosh workstations, something
> called "blackmagic video output" to go to the video projectors
>
> —
> f.e chanfrault | aka | personal computer music
> >>>>>>> http://www.personal-computer-music.com
> >>>>>>> |sublime music for a desperate people|
>
—————————————————-


March 1, 2008 | 7:27 pm

On Feb 28, 2008, at 3:42 PM, karl-otto von oertzen wrote:
>
> "loadram" can help but jitter has a 2gb limit :(
>

That’s not actually true – while jitter does have a 2GB limit for
jit.matrix objects, the jit.qt.movie object CAN load files larger
than 2GB. We’ve done some that are over 4GB, but it eats up a lot of
real RAM (much more than the movie file size itself, by a factor of
about 4X)

Cheers
Evan


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