The Video Processing System part 4

Sep 26, 2009 at 8:14am

The Video Processing System part 4

I’ve got a question to the experienced jitter users. i am just reading the part 4 of the “The Video Processing System” tutorial. in the subpatch for the poly~ abstraction building the video-player i find the the message-box with the loadram messages. According to the tutorial description the author intents to load the “first and last 2 seconds” of the movie into RAM (asuming a timescale of 600).

I do understand that for the second loadram message, but shouldn’1 have the first one also two arguments (in this case “loadram 0 1200″ instead of (loadram 1200)?

i understand the reference in that way that loadram with one argument specifies the track to be loaded.

Thanks for all answers.

Best Jan

#45622
Sep 26, 2009 at 8:58am

jit.qt.movie reference:
….
Two additional arguments may be used to specify start and end times for the loadram operation. So, loadram followed by 2 arguments will load a specified portion of an entire movie, while loadram followed by 3 arguments will cause the jit.qt.movie to load a portion of a single track into RAM.

#164563
Sep 26, 2009 at 9:06am

that what i thought as well. so its a bug in the tutorial…

#164564
Sep 27, 2009 at 7:31pm

You are correct. This is an error in the patch. I will update the file soon.

Best,
Andrew B.

#164565
Sep 28, 2009 at 7:56am

i hope you don’t get me wrong. i don’t want to be picky – i was just confused and suspecting some special tricks as i am still in the process of learning jitter.

Thanks for the clarification and the of course for your tutorial – that help me quite a bit in my own work.

And as we are already speaking about corrections. (well now it’s sounds really picky ) there is another point i found: I think inside the texture-conversion subpatch the right switch object should be “switch 1 2″. At the moment it is “switch 2 2″.

best

jan

– Pasted Max Patch, click to expand. –
#164566
Sep 30, 2009 at 9:34am

I must add that it would be cool if we could add comments to the tutorials articles. Since it’s the best place to ask questions about the patches or do debugging like this. Or maybe just create a subject in the forum and add a link to it in the tutorial.
Pierre

#164567
Sep 30, 2009 at 10:57pm

I have updated the tutorial patch with the appropriate change. The switch arguments are in fact correct. By default, the left switch passes input 1 and the right one, input 2. This is reflected in the respective arguments.

Thanks for spotting the error.

Andrew B.

#164568
Oct 12, 2009 at 10:42pm

I’ve been really excited by all of the VPS tutorials and was especially happy to have a patch using poly~ for movies to learn from. However, In my tests of the patch I’ve been having a disappointing performance issue.

I’m loading a folder of about 15 DV clips (all fairly short, 15 seconds or less) and for the first time that I cycle thru the clips there is a black flash between each one. After I have triggered every clip at least once this problem goes away. I am very confused my this and haven’t the foggiest idea where to begin troubleshooting. Any clues as to what is causing this and how I might fix it would be greatly appreciated.

TIA!

SS

#164569
Oct 22, 2009 at 8:09pm

Yes don’t use DV clips you need to convert your video clips into a different codex. Currently the best videos for running in Jitter as my understanding is Photo – JPEG and Apple ProRes 422.

#164570
Oct 22, 2009 at 8:35pm

The black frames issue is addressed in this forum thread:
http://www.cycling74.com/forums/index.php?t=msg&th=41522&start=0&rid=0&S=3dc3b83ddbead110c3eb6da5df4dec6f

Best,
Andrew B.

#164571
Nov 4, 2009 at 11:56pm

hi,

two questions :
why do you preload the last 2 seconds too ?
isn’t it better to use @editmode 1 and enter this values as ms ?

thx.
f./

#164572

You must be logged in to reply to this topic.