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mr.l

it has been a very long time that I used Max. (Jitter). Just downloaded the new version on a Win10 PC. I want to get a UHD video input, using a Blackmagic Decklink 8k Pro Card. 

Capture Settings should be 3840x2160 25p. Works fine on the Decklink MediaCapture Software.

Trying to capture in Max with Jit.grab -> Blackmagic (using the help patcher) Max crashes immediatly.

Why is that, is there something new I am not seeing?

Hello,

it has been a very long time that I used Max. (Jitter). Just downloaded the new version on a Win10 PC. I want to get a UHD video...

max-crash-trying-4k-blackmagic-capture

Max Crash trying 4k Blackmagic Capture

Tarik

In avf mode, the jit.record object doesn't accept many frames in rapid succession. After about 4 frames triggered by an uzi, it posts the message 'writer input not ready for media data'. In quicktime mode all's fine.

to reproduce, please paste this bit & click button.

anybody got easy workarounds apart from working with delays and such?

jit-record-writer-input-not-ready-for-media-data-bug

this is not so much a bug, as it is a limitation of the AVF engine. lots of things like this, that used to work with quicktime, don't work with avf due to the asynchronous nature of so much of the library. 

i've registered a feature request to output a notification from jit.record when it's ready to accept media data, which could be used to trigger the next frame.

in the meantime, some sort of delay is your only option. i did it like this (adjust the delay time for your setup and processing needs):


Yes, that feature would be really handy. Until then, the delay method will do.

One thing I've noticed is that the choice of codec has some influence over the occurrence of this 'writer input not ready for media data' error. If I use h264, the Max console rains full of errors. If I use prores4444 I only have a very occasional 'writer input not ready for media data', and they do not occur at all with prores422 on my MBP running 10.10.3. Which is a perfect codec for the experimental nonsense I output from jitter.


fyi I get the same error under avf when trying to export movs from jit.matrixset


I still encounter this problem with jit.record & jit.matrixset on OSX nowadays.
Using jit.vcr instead of jit.record solved the problem for me (using OSX 10.13.6 & Max 7.3.5).

for exporting from jit.matrixset, try switching the video engine preference to viddll

jit.record: writer input not ready for media data (bug?)

DaSheng Hen

Issue with jit.playlist Node Loading HAP Video on macOS: UI Display Error (The video can be played normally)

This problem goes away when the video engine switches to Viddll, but from what I've heard performance is better with avf on a Mac.

Issue with jit.playlist Node Loading HAP Video on macOS: UI Display Error (The video can be played normally)

This problem goes away when...

issue-with-jitplaylist-node-loading-hap-video-on-macos-ui-display-error

Issue with jit.playlist Node Loading HAP Video on macOS: UI Display Error

Len Richardson

I'm experiencing some issue with jit.gl.node. 

Can anyone here open the jit.gl.node.maxhelp patch and draw to multiple nodes in the multi-node-tab? 

When applying more then one drawto elements, Max simply keeps crashing everytime.

Still on Version 8.6.5 and M1 with latest OS.

Hey there,

I'm experiencing some issue with jit.gl.node. 
Can anyone here open the jit.gl.node.maxhelp patch and draw to multiple nodes in...

max-keeps-crashing-when-changing-drawto-attribute-for-jitglnode

Max keeps crashing when changing @drawto attribute for jit.gl.node 

Simon  Laroche

I've been having a problem with a complex patch that records a video input (jit.grab) and mixes it with sound coming in from a sound card using jit.vcr. It's part of a video booth installation where recordings of 1-2 minutes of videos of people talking are done.

The patch runs well for about 20+ users, but around user 25 to 30, a loss of sync becomes noticeable between the recorded sound and the video. The actual files written on the hard drive present this loss of sync, not the Max playback.

The only way to get rid of this sync problem is to restart the computer / Max.

I was thinking it could be some kind of memory leak from the various objects (poke, jit.vcr, etc), but when I compared the memory usage at user1 vs user20, user25, there is no considerable difference. 

Furthermore, a separate recording of the sound (sfrecord) and the video (jit.record) was tested, with a recombination on playback, and the lag still persists, which probably means that the problem is not in the recording process.

It's not "how long the patch has been running for", it "how many recording have been done / users have been through" that creates this out of sync problem. Meaning the thing can run for a whole day with a few users and it's fine. But one hour with plenty of users creates the problem, or a full day with the same amount of users. 

We've tried updating the Max version to the latest 8, updating the OS to the latest on the Mac Mini M1, etc, to no avail. 

I'm trying to figure out other ways to decompose the problem in order to find a solution.

Hello all,

I've been having a problem with a complex patch that records a video input (jit.grab) and mixes it with sound coming in from a...

lag-or-loss-of-sync-with-jitvcr-jitrecord-and-sfrecord

Lag or loss of sync with jit.vcr, jit.record & sfrecord

pseudostereo

In this patch, both paths are receiving the same position data from  jit.bfg. The green jit.gl.path gets its data directly, and the red path gets it through the @drawpath attribute of the jit.anim.path.

Why is the red path two dimensional? (all points are at the same depth)

Why doesn't the yellow sphere stay on the red path evenly from beginning to end?

Also: the docs for jit.path and jit.anim.path (but not jit.gl.path) list a 'closed' attribute. That would be nice, but that attribute doesn't seem to exist.

In this patch, both paths are receiving the same position data from  jit.bfg. The green jit.gl.path gets its data directly, and the red...

some-path-problems

some path problems

Linh Truong

Hi all! I am running a video installation with pressure sensors from an Arduino triggering specific video clips. When they are not being triggered, I have a blank video clip that plays instead. However, sometimes the videos get stuck. They will trigger on but not turn off until I click the read message for the black video. Vice versa, the opposite will happen where the videos trigger initially, but then after a while, the videos stop triggering. This is resolved when I click the video files read messages. I have tried routing the bangs to the read messages and then to the jit.movie, but this causes Max to crash eventually. I'm a newbie to Max/MSP/Jitter and would appreciate any feedback about how to fix this issue or how to streamline/edit my patch in a more efficient way. Thanks in advance for your help! 

FYI, I am using Max 8.6.4 on a Mac Mini M2 16 GB Sonoma 14.6.1 if any of that is helpful info. 

Hi all! I am running a video installation with pressure sensors from an Arduino triggering specific video clips. When they are not being...

max-jitter-videos-get-stuck

Max Jitter videos get stuck

Abao

I was looking for way to read SVG file as matrix in jitter, then I finally find this tool, but then I got this error message after I feed my SVG to it: "could not create svg object from XML string", any ideas? cheers.

reading-svg-by-sadam-rapidxml

Reading SVG by sadam.rapidXML

Ed Selby

I got an issue when capturing UHD video via a Blackmagic PCIe card using the device

The captured image is fine when using @output_texture 0 but it is half the width with artifacts when using @output_texture 1. See the screenshot attached.

Is there a solution to get the full width resolution for @output_texture 1 ?

are working in terms of texture resolution.

Jitter Forum