Kategorie-Archiv: Video

Use FFmpeg to record from webcam, pipe output to FFplay

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This code will record the video which is grabbed from an USB webcam and save it to a file. In parallel, it will output a preview to your screen by piping ffmpeg’s output into ffplay. The code is tested on a Raspberry Pi 5, the webcam in question is a Logitec c920. The output to screen has some noticeable lag and low resolution but it’s enough to help as a control.

 

ffmpeg -y -f v4l2 -input_format mjpeg -video_size 1280x720 -framerate 30 -i /dev/video0 -vcodec libx264 -an output.mp4 -f nut - | ffplay -i -

Use FFmpeg to find a possible loop in a video

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As stated an multiple occasions, I am doing live visuals every now and then for various events. Most of my footage is based on shaders. In (very) short: These are programs that are executed on your graphics-card and create visuals in real-time instead of playing pre-made videos. Extremely interesting and extremely nerdy. You might want to check out https://glslsandbox.com/ to get an idea. However, trying to run shaders on, for example, a Raspberry Pi 4 instead of a top-tier Macbook pro has a huge amount of its very own quirks. Playing videos on an RPI4, however, doesn’t cause too many problems. 

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ofxSyphonProxy

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This app is based on openFrameworks. It is able to receive multiple Syphon streams, allows you to quad-warp them, reduces their resolution and sends everything out as another combined Syphon stream.

Get it here: https://github.com/Andymann/ofxSyphonProxy

As an example I have a simple VDMX-setup that consists of 2 individual layers. Each layer is sent out via Syphon.

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Livestreaming-Setup

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Im letzten Post habe ich u.a. geschrieben, dass mein monatlicher DJ-Gig im Trash in Osnabrück aufgrund des Corona-Lockdowns momentan nicht stattfindet. Die Idee, “irgendwas mit Streaming” zu machen, hatte ich schon länger, aber letztlich kam dadurch der nötige Schwung in das Thema.

Mein Setup im Trash in Osnabrück. Schätze, es dauert noch etwas, bis ich hier wieder loslegen kann
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Wireless Beamer with a Raspberry PI

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Without that Corona-thing it’s about once a month that I am deejaying in my favourite bar in my hometown (Trash in Osnabrück). Few months ago I bought a projector which I am using to do live visuals in parallel. It took me some time to figure it out but I think I found the setup with the best possible balance between transportability and useability.

That’s the Projector in action. It’s not that easy to find a canvas to do projections in that particular venue but everything is possible with a little fantasy and a magic arm with a Manfrotto-Clamp
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VDMX Setup

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As some of you might already know (because I’m constantly telling you about) I occasionally do lights and visuals in a discotheque. VDMX is my tool of choice for doing visuals and I was looking for the best hardware-controller for quite a long time. Recently, someone reminded me of the Kontrol F1 by Native Instruments and after working out some quick ideas I got myself a Kontrol F1 via ebay and built a VDMX-set around it. In this post I’ll describe the setup and how things are realized.

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Midi Clock to Ableton Link

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Long story short: This is an application which receives Midi clock data and converts them to Ableton Link. Target scenario is using it to enable Track Decks in Native Instrument’s Traktor being the Tempo Master in an Ableton Link Timeline. You can download it here (Github repo with compiled binary for macOS ).

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SMSWall: SMS to Open Sound Control

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Dieses Teil empfängt SMS und schickt sie als OSC-Daten weiter, damit sie von einer VJ-Software verarbeitet werden können.

Grobe Idee war es, bei öffentlichen Veranstaltungen mehr Interaktion mit den Besuchern zu ermöglichen. Der ein oder andere kennt vielleicht die Twitter-Wall. Bei der Letzten Cool-Savas-Tour wurde das glaube ich eingesetzt. Vor dem Gig war die Bühne mit Stoff verhangen und ein Beamer hat Tweets, die unter einem bestimmten #Hashtag liefen, aus dem Internet gezogen und auf den Vorhang projiziert. Die Konzertbesucher konnten also irgendwas unter einem bestimmten Hashtag twittern und es wurde dann quasi-live angezeigt. Ansonsten findet man soetwas typischerweise auch bei irgendwelchen Web2.0-Konferenzen, etc. Schätze überall da, wo man Sascha Lobo antrifft, steht auch eine Twitterwall.

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