Baudrate Flicker

sebastianmarschall · 16. November 2016

My setup:
Raspberry Pi 1 Model B, powered by micro usb
WS2801 - 114 LEDs + 5V 8A power supply
Level shifter

As so many people I also have the problem of randomly occurring flickering (only when using the framegrabber, no flashes when playing with the effects).
As you see above I have already added a level shifter to my setup hoping it would fix the problem.
But it changed nothing.

I then found another post where one user stated he solved the problem by changing the Baudrate.
I went as low as 50,000 - no more flickering. As soon as I go up do >100,000 the flashes are back again.

Can anyone tell me whats the problem in my case? Is my Raspi not capable enough?

Thanks for your help!

Code

// Automatically generated configuration file for Hyperion ambilight daemon
// Notice: All values are explained with comments at our wiki: wiki.hyperion-project.org (config area)
// Generated by: HyperCon (The Hyperion deamon configuration file builder)
// Created with HyperCon V1.03.1 (11.06.2016)


{
    // DEVICE CONFIGURATION
    "device" :
    {
        "name"       : "MyHyperionConfig",
        "type"       : "ws2801",
        "output"     : "/dev/spidev0.0",
        "rate"     : 50000,
        "colorOrder" : "rbg"
    },


    // COLOR CALIBRATION CONFIG
    "color" :
    {
        "channelAdjustment" :
        [
            {
                "id"   : "default",
                "leds" : "*",
                "pureRed" :
                {
                    "redChannel"        : 255,
                    "greenChannel"        : 0,
                    "blueChannel"        : 0
                },
                "pureGreen" :
                {
                    "redChannel"        : 0,
                    "greenChannel"        : 255,
                    "blueChannel"        : 0
                },
                "pureBlue" :
                {
                    "redChannel"        : 0,
                    "greenChannel"        : 0,
                    "blueChannel"        : 255
                }
            }
        ],
        "temperature" :
        [
            {
                "id"   : "default",
                "leds" : "*",
                "correctionValues" :
                {
                    "red"     : 255,
                    "green"    : 255,
                    "blue"     : 255
                }
            }
        ],
        "transform" :
        [
            {
                "id"   : "default",
                "leds" : "*",
                "hsl" :
                {
                    "saturationGain"    : 1.0500,
                    "luminanceGain"        : 1.2000,
                    "luminanceMinimum"        : 0.0000
                },
                "red" :
                {
                    "threshold"     : 0.1900,
                    "gamma"         : 2.0000
                },
                "green" :
                {
                    "threshold"     : 0.1900,
                    "gamma"         : 2.0000
                },
                "blue" :
                {
                    "threshold"     : 0.1900,
                    "gamma"         : 2.0000
                }
            }
        ],
    // SMOOTHING CONFIG
        "smoothing" :
        {
            "type"            : "linear",
            "time_ms"         : 200,
            "updateFrequency" : 25.0000,
            "updateDelay"     : 0
        }
    },


    // V4L2 GRABBER CONFIG
    "grabber-v4l2" :
    {
        "device" : "/dev/video0",
        "input" : 0,
        "standard" : "PAL",
        "width" : -1,
        "height" : -1,
        "frameDecimation" : 2,
        "sizeDecimation" : 4,
        "priority" : 800,
        "mode" : "2D",
        "cropLeft" : 6,
        "cropRight" : 6,
        "cropTop" : 2,
        "cropBottom" : 2,
        "redSignalThreshold" : 0.1,
        "greenSignalThreshold" : 0.1,
        "blueSignalThreshold" : 0.1
    },


    // BLACKBORDER CONFIG
    "blackborderdetector" :
    {
        "enable" : true,
        "threshold" : 0.14,
        "unknownFrameCnt" : 600,
        "borderFrameCnt" : 50,
        "maxInconsistentCnt" : 10,
        "blurRemoveCnt" : 1,
        "mode" : "default"
    },


    // BOOTEFFECT CONFIG
    "bootsequence" :
    {
        "color" : [0,0,0],
        "effect" : "Rainbow swirl fast",
        "duration_ms" : 3000,
        "priority" : 700
    },


    // JSON SERVER CONFIG
    "jsonServer" :
    {
        "port" : 19444
    },


    // PROTO SERVER CONFIG
    "protoServer" :
    {
        "port" : 19445
    },


    // EFFECT PATH
    "effects" :
    {
        "paths" :
        [
            "/storage/hyperion/effects",
            "/usr/share/hyperion/effects"
        ]
    },


    // NO FRAME GRABBER CONFIG
    // NO KODI CHECK CONFIG
    // NO BOBLIGHT SERVER CONFIG
    // NO JSON/PROTO FORWARD CONFIG


    // LED CONFIGURATION
    "leds" :
    [
        {
            "index" : 0,
            "hscan" : { "minimum" : 0.5946, "maximum" : 0.6216 },
            "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
        },
        {
            "index" : 1,
            "hscan" : { "minimum" : 0.6216, "maximum" : 0.6486 },
            "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
        },
        {
            "index" : 2,
            "hscan" : { "minimum" : 0.6486, "maximum" : 0.6757 },
            "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
        },
        {
            "index" : 3,
            "hscan" : { "minimum" : 0.6757, "maximum" : 0.7027 },
            "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
        },
        {
            "index" : 4,
            "hscan" : { "minimum" : 0.7027, "maximum" : 0.7297 },
            "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
        },
        {
            "index" : 5,
            "hscan" : { "minimum" : 0.7297, "maximum" : 0.7568 },
            "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
        },
        {
            "index" : 6,
            "hscan" : { "minimum" : 0.7568, "maximum" : 0.7838 },
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        },
        {
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        },
        {
            "index" : 8,
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            "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
        },
        {
            "index" : 9,
            "hscan" : { "minimum" : 0.8378, "maximum" : 0.8649 },
            "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
        },
        {
            "index" : 10,
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        {
            "index" : 17,
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        {
            "index" : 18,
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        {
            "index" : 19,
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        {
            "index" : 21,
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        {
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            "hscan" : { "minimum" : 0.0811, "maximum" : 0.1081 },
            "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
        },
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            "hscan" : { "minimum" : 0.1081, "maximum" : 0.1351 },
            "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
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            "hscan" : { "minimum" : 0.1892, "maximum" : 0.2162 },
            "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
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            "index" : 100,
            "hscan" : { "minimum" : 0.2162, "maximum" : 0.2432 },
            "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
        },
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            "hscan" : { "minimum" : 0.2432, "maximum" : 0.2703 },
            "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
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            "hscan" : { "minimum" : 0.3243, "maximum" : 0.3514 },
            "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
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            "hscan" : { "minimum" : 0.3514, "maximum" : 0.3784 },
            "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
        },
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            "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
        },
        {
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            "hscan" : { "minimum" : 0.4324, "maximum" : 0.4595 },
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            "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
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        }
    ],


    "endOfJson" : "endOfJson"
}

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penfold42 · 16. November 2016

I wonder if the grabber is returning junk sometimes ?

sebastianmarschall · 16. November 2016

Zitat von penfold42

I wonder if the grabber is returning junk sometimes ?

good point, is there a way to find out?

penfold42 · 16. November 2016

Some sort of command line capture+record tool would good.

Also, Can you try dropping the capture resolution ?

My theory is there's too much IO with higher speed spi and high capture by rate causing issues

epicfail83 · 17. November 2016

Does the reduction of the baudrate have any disadvantages?

penfold42 · 17. November 2016

Just on the update rate of the leds.

144 leds * 24 bits = 3456 bits per frame.

50,000 bits per second = 14 frames per second (roughly - I'm also ignoring the 500uSec latch time)

epicfail83 · 17. November 2016

Is it noticable that the baudrate is lower for the humans eye? I also have a levelshifter and sometimes flickering....but i have a baudrate of 1000000 in my config....

penfold42 · 17. November 2016

Probably unnecessarily high.

Smoothing will set the update rate and if you're bit rate could do updates is an order of magnitude faster it's pointless

epicfail83 · 17. November 2016

Sry, dont really unterstand....english is not my native language...;)

Here is my config...should i reduce the baudrate to get rid of the flickering?

Code

{
    /// DEVICE CONFIGURATION
    "device" :
    {
        "name"       : "MyHyperionConfig",
        "type"       : "ws2801",
        "output"     : "/dev/spidev0.0",
        "rate"     : 1000000,
        "colorOrder" : "rgb"
    },


    /// COLOR CALIBRATION CONFIG
    "color" :
    {
        "channelAdjustment" :
        [
            {
                "id"   : "default",
                "leds" : "*",
                "pureRed" :
                {
                    "redChannel"        : 210,
                    "greenChannel"        : 0,
                    "blueChannel"        : 0
                },
                "pureGreen" :
                {
                    "redChannel"        : 140,
                    "greenChannel"        : 230,
                    "blueChannel"        : 0
                },
                "pureBlue" :
                {
                    "redChannel"        : 0,
                    "greenChannel"        : 0,
                    "blueChannel"        : 230
                }
            }
        ],
        "temperature" :
        [
            {
                "id"   : "default",
                "leds" : "*",
                "correctionValues" :
                {
                    "red"     : 200,
                    "green"    : 200,
                    "blue"     : 200
                }
            }
        ],
        "transform" :
        [
            {
                "id"   : "default",
                "leds" : "*",
                "hsl" :
                {
                    "saturationGain"    : 0.8000,
                    "luminanceGain"        : 1.0000
                },
                "red" :
                {
                    "threshold"     : 0.1000,
                    "gamma"         : 1.6000
                },
                "green" :
                {
                    "threshold"     : 0.1000,
                    "gamma"         : 1.2000
                },
                "blue" :
                {
                    "threshold"     : 0.1000,
                    "gamma"         : 1.5000
                }
            }
        ],
    /// SMOOTHING CONFIG
        "smoothing" :
        {
            "type"            : "linear",
            "time_ms"         : 200,
            "updateFrequency" : 25.0000,
            "updateDelay"     : 0
        }
    },

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penfold42 · 17. November 2016

Yes

Try 100000

epicfail83 · 18. November 2016

Thanks...will test a few days...and see what happens

Baudrate Flicker

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