Ancestors

Written by Firesledge 🔥🛷 on 2024-11-20 at 17:53

Playing with video rendering code emulating an analogue oscilloscope, implemented as a plug-in for #VapourSynth and #AviSynth.

It looks decent, but I think I need some autocorrelation stuff to properly lock the waveform.

[#]video #plugin #audio

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Written by Firesledge 🔥🛷 on 2024-11-27 at 15:09

This is now much better. The autocorrelation efficiently locks the waveform even with a complex harmonic content combined with a weak fundamental. Not perfect, but good enough.

Here, the scope shows 20 ms of audio per beam sweep. The video is 30 fps, or 33 ms per frame, therefore there is one and a half sweep per frame at best, generally less (open shutter time is 100%). This causes a bit of shimmering, especially on stable signals. This is the same kind of artefact appearing when filming a CRT display in the real life! Anyway I see several ways to mitigate this.

[#]video #plugin #audio #AviSynth #VapourSynth #oscilloscope

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Toot

Written by Firesledge 🔥🛷 on 2024-11-27 at 21:01

Oh and I almost forgot, there’s a nice scrolling version too.

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Descendants

Written by Firesledge 🔥🛷 on 2024-12-22 at 17:43

I pushed the repository for the oscilloscope emulation source code (video plug-in for the #VapourSynth and #AviSynth engines):

https://gitlab.com/EleonoreMizo/faveworm

I’ll do a proper release with compiled library, doc, etc. later.

[#]faveworm #VideoProcessing #CRT #oscilloscope #audio

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