showing time duration and run time in wavesurfer

You can set an animation effect to start when you click the mouse, or in coordination with other animation effects on the slide. This article will show you a few ways to fine-tune the animations in your presentations. You can even repeat or rewind the effect to get just the right look and feel for your presentation. In PowerPoint, you can control when an animation effect starts and the speed at which it happens. I have no experience diagnosing memory leaks but found it odd that when I turned on displaying 'Javascript memory' inside Chrome's Task Manager it isn't showing up as 'Javascript memory' usage just as general 'Memory footprint'.PowerPoint for Microsoft 365 PowerPoint 2021 PowerPoint 2019 PowerPoint 2016 PowerPoint 2013 PowerPoint 2010 More. Due to the above don't run delete inside of Chrome's console put it in your own code.This seems very odd but it seems having developer tools open sometimes caused the memory to not be released. (Unsure about this) Try closing Chrome's developer tools.Refreshing the tab doesn't always release the memory. Try opening a new tab every time you test.It can take up to 5 seconds for the memory to be released so don't come to conclusions to quickly.I was testing this without providing Peak data as that increases memory usage.ĭue to the inconsistencies (and me getting frustrated debugging this) here's a few potential tips when diagnosing this: ( Update: Just had about 10 times in a row where this solution didn't clear the memory, very odd.)Īlso it only worked on MediaElementWebAudio it didn't work on WebAudio. Running it 20 times in a row I would often get one time where it wouldn't work. delete seems to work but it's inconsistent. In any case, in part this is running up against browser quirks but there is definitely a Wavesurfer bug here if stroy() doesn't properly release its reference to the buffer.įor anyone else having trouble diagnosing this. Interestingly, in a quick test in Win10/Firefox, = null seems to do the trick and purge instantaneously. In the Wavesurfer test the only way I can get Chrome to purge is if I load() a small dummy file. In the vanilla web audio test, Chrome doesn't always purge the buffer instantaneously after setting the reference to null, but it's usually within seconds, sometimes a minute or 2.

Here are 2 test pages I set up as I am trying to determine the most reliable way to purge a large audio buffer from memory in order to make room for loading another without having to refresh the page: Obviously there are some browser caching and memory management quirks out of our control and it doesn't always release memory when we want it to, but it usually does. That's at least in my own usage, with no Wavesurfer plugins or interactivity, just using Wavesurfer for visualizing. Even with all of Wavesurfer's DOM/Canvas stuff the amount of RAM used by that is negligible compared to 300MB of audio (like maybe 20mb). Yes I have compared and they are nearly identical. Simple example, go to and open the console:

Wavesurfer handles drawing large sounds beautifully too, but even after a call to destroy I can see that there are still retained references to the buffer in the Wavesurfer object, preventing garbage collection. Therefore this is almost certainly not a Web Audio API/browser bug. If you set a variable holding an audio buffer to null the memory is typically purged within seconds by the garbage collector. I know those MDN docs recommend short sound files but in practice on a decent machine Chrome handles larger audio files beautifully and I often work with tracks >1 hour in length as decoded buffers with the Web Audio API with no issues. This is most apparent when using large audio files. I can confirm that Wavesurfer is erroneously not releasing the audio buffer after a call to destroy(), which results in the buffer not being garbage collected and persisting in memory even after subsequent calls to load() different sound files using the same Wavesurfer instance. Hello, I've been noticing this same issue on my end (Win 10, latest Chrome, latest Wavesurfer).

Showing time duration and run time in wavesurfer