Stijn

i'm quite new to jitter but I' can't seem to make this simple patch work.

What I need is pretty simple: I have two screens on my computer, and I want to show random chosen movie clips on each screen from a list (or playlist). The screens will end up being large projection screens and image quality is an issue (I want it as good as possible). It's for a video installation that will run on two mac mini's. (4 screens, two per mac mini). the selection of files is 44 separate qt movies (720p, H264).

I've built something in max 6, but the loopreport of my jit.qt.movie object never worked flawlessly, and the rendered video wasn't too smooth. So I upgraded to max 7 to take advantage of the better video output. However, I still have the same problems in my max 6 patch. (also, previously I had rendered the video's to applemotionjpeg to lighten the cpuload, but max 7 doesn't recognise that codec, max 6 did)

And I tried building a patch for max 7 where an urn controls which video from a playlist should be played. That works fine. But when I try to double the playlist, max crashes every time (and one time, my whole laptop crashed). I've tried copying the jit.playlist, making a new jit.playlist object and reimporting the files. and even making two seperate patches, but max crashes every time as soon as the second playlist is created.

is there an upper limit to the size of a jit.playlist?

Am I doing something wrong? Or does anybody has a workaround or even a better / easier solution for this?

I've attached the max 6 patch, the filmlijst.txt isn't included, neither are the video's. but the txt was a simple list that could be read by coll with the names of the videos, which were stored in the same folder as the patch. I also uploaded the max 7 patch (with a single playlist) (and just noticed that if I manually bang bang the urn object, the playlist emits a whole series of 'done' messages).

laptop specs are: macbook pro 2.7 i7, 16gb ram (the mac minis will be considerably less, but they have a gpu)

thanks in advance for any help you could offer,

i'm quite new to jitter but I' can't seem to make this simple patch work. 

What I need is pretty simple: I have two screens on my computer, and I want to show random chosen movie clips on each screen from a list (or playlist). The screens will end up being large projection screens and image quality is an issue (I want it as good as possible). It's for a video installation that will run on two mac mini's. (4 screens, two per mac mini).  the selection of files is 44 separate qt movies (720p, H264). 

And I tried building a patch for max 7 where an urn controls which video from a playlist should be played. That works fine. But when I try to double the playlist, max crashes every time (and one time, my whole laptop crashed). I've tried copying the jit.playlist, making a new jit.playlist object and reimporting the files. and even making two seperate patches, but max crashes every time as soon as the second playlist is created. 

is there an upper limit to the size of a jit.playlist? 

Am I doing something wrong? Or does anybody has a workaround or even a better / easier solution for this? 

I've attached the max 6 patch, the filmlijst.txt isn't included, neither are the video's. but the txt was a simple list that could be read by coll with the names of the videos, which were stored in the same folder as the patch. I also uploaded the max 7 patch (with a single playlist) (and just noticed that if I manually bang bang the urn object, the playlist emits a whole series of 'done' messages). 

thanks in advance for any help you could offer,
Stijn


multiple-jit-plalists-in-a-patch

unless you need the jit.playlist GUI for your patch, i would forgo jit.playlist for a jit.movie object embedded in a poly~ object.

the most important thing for performance with jit.movie, is to enable @output_texture 1. this requires creating a gl context, and keeping your video frames on the GPU (meaning you can't use any jitter matrix objects downstream from the jit.movie). this is very easy to achieve in max 7 simply by creating a jit.world object.

the jit.movie in each poly~ instance should be instantiated something like: "jit.movie @drawto world-ctx @output_texture 1 @autostart 0 @colormode uyvy"

world-ctx is simply the jit.world argument, that sets it's context name. colormode uyvy should be used if you aren't using alpha channels (transparency) in your video files.

the recommended codecs on the Mac are prores 422 or photo-jpeg, proress 4444 if you need an alpha channel, or h264 if you prefer to keep the file sizes down and are willing to sacrifice some performance to do so.

the jit.movie in each poly~ instance should be instantiated something like: "jit.movie @drawto world-ctx @output_texture 1 @autostart 0 @colormode uyvy"
world-ctx is simply the jit.world argument, that sets it's context name. colormode uyvy should be used if you aren't using alpha channels (transparency) in your video files.

the recommended codecs on the Mac are prores 422 or photo-jpeg, proress 4444 if you need an alpha channel, or h264 if you prefer to keep the file sizes down and are willing to sacrifice some performance to do so.


i went ahead and threw together a basic poly-movie patch that demonstrates the main features of Max 7 (for more examples and background info, search for "poly for movie" or andrew benson's video processing tutorial)

the main thing you want to keep in mind with something like this, is to make sure you have only one movie playing at a time (so triggering the previous movie to stop, before triggering the current movie to start). also, memory usage will become an issue with several movies loaded, so might be best to run this in 64 bit mode. you can easily duplicate this for each display you want playback on.

multiple jit.plalists in a patch?