Had a whole day of crashing max and its sapped my strength to the extent that I can’t work out how to calculate milliseconds to frames.
I have a 600 second long audio buffer and i want to point bufloudness and its buddies at specific chunks of it.
EDIT:
Looking at the reference for bufloudness it says:
numframes [int]
Where in the srcBuf should the process start, in sample.
Does that mean i have to specify in samples relative to my source file? I’m confused.
Cheers,
John.
From the looks of the srcBuf it looks like you’re on a (much?) older version of the toolbox, so probably worth nabbing the most recent one:
The general idea though is that the @startframe is where in your target buffer you want to start and @numframes is how long for.
So @startframe 44100 @numframes 22050 will analyze 500ms starting 1000ms into the file.
If you’re always wanting to analyze the same size chunk you can just set the attribute to a fixed size (@numframes 11025) and then do the rest with messages (in a message: startframe 88888, bang).
As a point of reference, here is a chunk from my performance patch that does more-or-less what you’re describing (though on a much smaller buffer):
----------begin_max5_patcher----------
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-----------end_max5_patcher-----------
edit:
you can ignore the @blocking stuff, as well as the hyper-specific buffer~ stuff, that’s just for threading purposes in my patch
I hope it was not our objects - although if it was it would be good to know!
that could explain the crashes!
thanks @rodrigo.constanzo for the amazing response!
To reply to your original question:
It has to be in samples in the source buffer, not the file. Your source buffer can be made of many things.
In your case, let’s say you have a live buffer. You know the sampling rate of Max, so you know the SR of the buffer. Then your ‘specific chunk’ to analyse will be (time in MS) * SR / 1000.0. Your duration of analysis will be (duration in MS) * SR / 1000.
So for a 44.1kHz running process of RT buffers, wanting to analyse the 3rd second (between second 2 and 3) you would get numframes to 44100 (one second) and startframe to 88200 (after 2 seconds)
p
Thanks for the clarification @rodrigo.constanzo & @tremblap
So it’s in samples then - that makes sense. I was confused by the documentation.
Just noticed that there are two versions of bufloudness~ in my search path - Max found a version in your Cloud v2.1 M4L patch. Not sure if that explains the documentation though…
(a few moments later)
I’ve made sure I’m on the latest version as linked by @rodrigo.constanzo and made sure there are only one set of objects in the search path but the documentation for remains the same. I’m using the PC version so maybe this version of the fluid.bufloudness~ reference is not yet updated?
they should be identical. Maybe @weefuzzy has a wise explanation… but make sure you downloaded and installed the package from the pinned link in the code sharing category (beta02)
My wise explanation is that John is correct that this is what the reference currently says, presumably because I missed it (along with much else) whilst spring cleaning the reference files. I can see how the combination of (a) referring to an attribute that is now called something else, and (b) missing the plural of samples wouldn’t aid understanding.
It’s probably broken in the same way for a lot of the buf* objects that ‘wrap’ real-time ones. Sorry everyone.
thanks @weefuzzy - Just got this slightly ambiguous error message in the max window:
fluid.bufloudness~: Not enough channels in buffer
If I open the help file it goes away so I’m guessing I didn’t copy something over - It’d be cool if the error was a bit more specific about which buffer - ie the source or the destination buffer didn’t have enough channels.
Agreed. I just had to search the code for it 
So, it will definitely be improved.
It happens when @blocking is set to 2 in a buf object, meaning that it runs all the processing directly in the scheduler thread, but won’t attempt to resize any buffers~. So, getting that could mean either:
@blocking 2 is tricky when you’re still developing, because all the buffers need to be exactly the right size (and the error messages are pretty lousy, it turns out).
Ahhh! That explains a thing or two. I didn’t realise that @blocking 2 didn’t manage the buffer sizes. That helps me understand why @blocking 1 is causing a little hiccup in the constant graphic drawing i’m doing in my patch. Ironically @blocking 0 gives me the worst hiccuping.
In this circumstance I think I can get away with @blocking 1 as it only seems to pause the graphic drawing on the first call for processing.
Yeah, if it’s a small frequent job, then @blocking 0 will probably cause more overhead creating and launching a new thread than the original job cost. Given that all that happens on the main thread, it will be particularly bad for interrupting drawing things.
The burp on the first run probably is due to buffer resizing. If that size isn’t going to change, could be worth hard coding it and using @blocking 2, once you’re happy everything is working.