Problem with

[axel-tanner]

Not sure whether this is a Mac specific issue, but on my MacBook Pro running the slit-scan-001 tutorial via

./gradlew :slit-scan-001:run

results in

3.3.0 Cocoa NSGL dynamic
tracking verteBuffer org.openrndr.internal.gl3.VertexBufferGL3@31c88ec8
OpenGL vendor: ATI Technologies Inc.
OpenGL version: 4.1 ATI-2.9.26
looked for format: org.bytedeco.javacpp.avformat$AVInputFormat[address=0x13f282070,position=0,limit=0,capacity=0,deallocator=null] got avfoundation
[avfoundation @ 0x7fa6da0ab200] Selected framerate (29.970030) is not supported by the device
...
Exception in thread "main" org.openrndr.ffmpeg.adopted.FrameGrabber$Exception: avformat_open_input() error -5: Could not open input "0". (Has setFormat() been called?)
        at org.openrndr.ffmpeg.adopted.FFmpegFrameGrabber.startUnsafe(FFmpegFrameGrabber.java:638)
        at org.openrndr.ffmpeg.adopted.FFmpegFrameGrabber.start(FFmpegFrameGrabber.java:567)
        at org.openrndr.ffmpeg.FFMPEGVideoPlayer.start(FFMPEGVideoPlayer.kt:101)
        at Example.setup(Example.kt:24)
        at org.openrndr.internal.gl3.ApplicationGLFWGL3.loop(ApplicationGLFWGL3.kt:510)
        at org.openrndr.Application$Companion.run(Application.kt:29)
        at ExampleKt.main(Example.kt:67)
Assertion failed: (_localEvalOnceCondition), function PropertiesChanged, file /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleUSBCamera/AppleUSBCamera-193.260.10/Sources/Extras/CoreMediaIO/DeviceAbstractionLayer/Devices/DP/Base/CMIO_DP_Object.cpp, line 582.

Including a specific framerate in https://github.com/openrndr/openrndr-tutorials/blob/master/slit-scan-001/src/main/kotlin/Example.kt, ie:

videoPlayer = FFMPEGVideoPlayer.fromDevice()

→

videoPlayer = FFMPEGVideoPlayer.fromDevice(framerate=30.0)

makes it work for me.