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RPi + Other Software LED's keep flickering

Discussion in 'Software Support' started by Ryan, 15 October 2018.

  1. Ryan

    Ryan New Member

    Messages:
    13
    Hardware:
    RPi1/Zero, RPi3
    Hello,

    I installed Hyperion on my Raspberry Pi Zero W. Everything works fine, but I get white flickering LED's sometimes. I used different calibration images to test it. I only get white flickering LED's at the bottom when I use the following images:

    [​IMG]

    [​IMG]

    I dont get the flickering when I use the following images:

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    Also during the boot effects, I don't get the flickering.
    I am using a Raspberry Pi Zero W with an APA102 led strip and a UTV007 video grabber.
    This is my config file:

    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 V1.03.3 (22.10.2017)
    
    {
        // DEVICE CONFIGURATION
        "device" :
        {
            "name"       : "MyHyperionConfig",
            "type"       : "apa102",
            "output"     : "/dev/spidev0.0",
            "rate"     : 1000000,
            "colorOrder" : "bgr"
        },
    
        // 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"        : 240
                    }
                }
            ],
            "temperature" :
            [
                {
                    "id"   : "default",
                    "leds" : "*",
                    "correctionValues" :
                    {
                        "red"     : 255,
                        "green"    : 255,
                        "blue"     : 255
                    }
                }
            ],
            "transform" :
            [
                {
                    "id"   : "default",
                    "leds" : "*",
                    "hsl" :
                    {
                        "saturationGain"    : 1.0000,
                        "luminanceGain"        : 0.7500,
                        "luminanceMinimum"        : 0.0000
                    },
                    "red" :
                    {
                        "threshold"     : 0.0000,
                        "gamma"         : 2.5000
                    },
                    "green" :
                    {
                        "threshold"     : 0.0000,
                        "gamma"         : 2.5000
                    },
                    "blue" :
                    {
                        "threshold"     : 0.0000,
                        "gamma"         : 2.5000
                    }
                }
            ],
        // SMOOTHING CONFIG
            "smoothing" :
            {
                "type"            : "linear",
                "time_ms"         : 200,
                "updateFrequency" : 30.0000,
                "updateDelay"     : 0
            }
        },
    
        // V4L2 GRABBER CONFIG
        "grabber-v4l2" :
        {
            "device" : "/dev/video0",
            "input" : 0,
            "standard" : "PAL",
            "width" : -1,
            "height" : -1,
            "frameDecimation" : 2,
            "sizeDecimation" : 8,
            "priority" : 500,
            "mode" : "2D",
            "cropLeft" : 5,
            "cropRight" : 3,
            "cropTop" : 4,
            "cropBottom" : 5,
            "redSignalThreshold" : 0.0,
            "greenSignalThreshold" : 0.0,
            "blueSignalThreshold" : 0.0
        },
    
        // BLACKBORDER CONFIG
        "blackborderdetector" :
        {
            "enable" : true,
            "threshold" : 0.04,
            "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
        },
    
        // JSON/PROTO FORWARD CONFIG
        "forwarder" :
        {
            "json" : ["127.0.0.1:19446"],
            "proto" : ["127.0.0.1:19447"]
        },
    
        // EFFECT PATH
        "effects" :
        {
            "paths" :
            [
                "/storage/hyperion/effects",
                "/usr/share/hyperion/effects"
            ]
        },
    
        // NO FRAME GRABBER CONFIG
        // NO KODI CHECK CONFIG
        // NO BOBLIGHT SERVER CONFIG
    
        // LED CONFIGURATION
        "leds" :
        [
            {
                "index" : 0,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.0000, "maximum" : 0.0345 }
            },
            {
                "index" : 1,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.0345, "maximum" : 0.0690 }
            },
            {
                "index" : 2,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.0690, "maximum" : 0.1034 }
            },
            {
                "index" : 3,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.1034, "maximum" : 0.1379 }
            },
            {
                "index" : 4,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.1379, "maximum" : 0.1724 }
            },
            {
                "index" : 5,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.1724, "maximum" : 0.2069 }
            },
            {
                "index" : 6,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.2069, "maximum" : 0.2414 }
            },
            {
                "index" : 7,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.2414, "maximum" : 0.2759 }
            },
            {
                "index" : 8,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.2759, "maximum" : 0.3103 }
            },
            {
                "index" : 9,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.3103, "maximum" : 0.3448 }
            },
            {
                "index" : 10,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.3448, "maximum" : 0.3793 }
            },
            {
                "index" : 11,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.3793, "maximum" : 0.4138 }
            },
            {
                "index" : 12,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.4138, "maximum" : 0.4483 }
            },
            {
                "index" : 13,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.4483, "maximum" : 0.4828 }
            },
            {
                "index" : 14,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.4828, "maximum" : 0.5172 }
            },
            {
                "index" : 15,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.5172, "maximum" : 0.5517 }
            },
            {
                "index" : 16,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.5517, "maximum" : 0.5862 }
            },
            {
                "index" : 17,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.5862, "maximum" : 0.6207 }
            },
            {
                "index" : 18,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.6207, "maximum" : 0.6552 }
            },
            {
                "index" : 19,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.6552, "maximum" : 0.6897 }
            },
            {
                "index" : 20,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.6897, "maximum" : 0.7241 }
            },
            {
                "index" : 21,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.7241, "maximum" : 0.7586 }
            },
            {
                "index" : 22,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.7586, "maximum" : 0.7931 }
            },
            {
                "index" : 23,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.7931, "maximum" : 0.8276 }
            },
            {
                "index" : 24,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.8276, "maximum" : 0.8621 }
            },
            {
                "index" : 25,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.8621, "maximum" : 0.8966 }
            },
            {
                "index" : 26,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.8966, "maximum" : 0.9310 }
            },
            {
                "index" : 27,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.9310, "maximum" : 0.9655 }
            },
            {
                "index" : 28,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0500 },
                "vscan" : { "minimum" : 0.9655, "maximum" : 1.0000 }
            },
            {
                "index" : 29,
                "hscan" : { "minimum" : 0.0000, "maximum" : 0.0189 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 30,
                "hscan" : { "minimum" : 0.0189, "maximum" : 0.0377 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 31,
                "hscan" : { "minimum" : 0.0377, "maximum" : 0.0566 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 32,
                "hscan" : { "minimum" : 0.0566, "maximum" : 0.0755 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 33,
                "hscan" : { "minimum" : 0.0755, "maximum" : 0.0943 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 34,
                "hscan" : { "minimum" : 0.0943, "maximum" : 0.1132 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 35,
                "hscan" : { "minimum" : 0.1132, "maximum" : 0.1321 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 36,
                "hscan" : { "minimum" : 0.1321, "maximum" : 0.1509 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 37,
                "hscan" : { "minimum" : 0.1509, "maximum" : 0.1698 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 38,
                "hscan" : { "minimum" : 0.1698, "maximum" : 0.1887 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 39,
                "hscan" : { "minimum" : 0.1887, "maximum" : 0.2075 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 40,
                "hscan" : { "minimum" : 0.2075, "maximum" : 0.2264 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 41,
                "hscan" : { "minimum" : 0.2264, "maximum" : 0.2453 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 42,
                "hscan" : { "minimum" : 0.2453, "maximum" : 0.2642 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 43,
                "hscan" : { "minimum" : 0.2642, "maximum" : 0.2830 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 44,
                "hscan" : { "minimum" : 0.2830, "maximum" : 0.3019 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 45,
                "hscan" : { "minimum" : 0.3019, "maximum" : 0.3208 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 46,
                "hscan" : { "minimum" : 0.3208, "maximum" : 0.3396 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 47,
                "hscan" : { "minimum" : 0.3396, "maximum" : 0.3585 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 48,
                "hscan" : { "minimum" : 0.3585, "maximum" : 0.3774 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 49,
                "hscan" : { "minimum" : 0.3774, "maximum" : 0.3962 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 50,
                "hscan" : { "minimum" : 0.3962, "maximum" : 0.4151 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 51,
                "hscan" : { "minimum" : 0.4151, "maximum" : 0.4340 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 52,
                "hscan" : { "minimum" : 0.4340, "maximum" : 0.4528 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 53,
                "hscan" : { "minimum" : 0.4528, "maximum" : 0.4717 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 54,
                "hscan" : { "minimum" : 0.4717, "maximum" : 0.4906 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 55,
                "hscan" : { "minimum" : 0.4906, "maximum" : 0.5094 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 56,
                "hscan" : { "minimum" : 0.5094, "maximum" : 0.5283 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 57,
                "hscan" : { "minimum" : 0.5283, "maximum" : 0.5472 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 58,
                "hscan" : { "minimum" : 0.5472, "maximum" : 0.5660 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 59,
                "hscan" : { "minimum" : 0.5660, "maximum" : 0.5849 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 60,
                "hscan" : { "minimum" : 0.5849, "maximum" : 0.6038 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 61,
                "hscan" : { "minimum" : 0.6038, "maximum" : 0.6226 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 62,
                "hscan" : { "minimum" : 0.6226, "maximum" : 0.6415 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 63,
                "hscan" : { "minimum" : 0.6415, "maximum" : 0.6604 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 64,
                "hscan" : { "minimum" : 0.6604, "maximum" : 0.6792 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 65,
                "hscan" : { "minimum" : 0.6792, "maximum" : 0.6981 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 66,
                "hscan" : { "minimum" : 0.6981, "maximum" : 0.7170 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 67,
                "hscan" : { "minimum" : 0.7170, "maximum" : 0.7358 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 68,
                "hscan" : { "minimum" : 0.7358, "maximum" : 0.7547 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 69,
                "hscan" : { "minimum" : 0.7547, "maximum" : 0.7736 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 70,
                "hscan" : { "minimum" : 0.7736, "maximum" : 0.7925 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 71,
                "hscan" : { "minimum" : 0.7925, "maximum" : 0.8113 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 72,
                "hscan" : { "minimum" : 0.8113, "maximum" : 0.8302 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 73,
                "hscan" : { "minimum" : 0.8302, "maximum" : 0.8491 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 74,
                "hscan" : { "minimum" : 0.8491, "maximum" : 0.8679 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 75,
                "hscan" : { "minimum" : 0.8679, "maximum" : 0.8868 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 76,
                "hscan" : { "minimum" : 0.8868, "maximum" : 0.9057 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 77,
                "hscan" : { "minimum" : 0.9057, "maximum" : 0.9245 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 78,
                "hscan" : { "minimum" : 0.9245, "maximum" : 0.9434 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 79,
                "hscan" : { "minimum" : 0.9434, "maximum" : 0.9623 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 80,
                "hscan" : { "minimum" : 0.9623, "maximum" : 0.9811 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 81,
                "hscan" : { "minimum" : 0.9811, "maximum" : 1.0000 },
                "vscan" : { "minimum" : 0.9200, "maximum" : 1.0000 }
            },
            {
                "index" : 82,
                "hscan" : { "minimum" : 0.9500, "maximum" : 1.0000 },
                "vscan" : { "minimum" : 0.9655, "maximum" : 1.0000 }
            },
            {
                "index" : 83,
                "hscan" : { "minimum" : 0.9500, "maximum" : 1.0000 },
                "vscan" : { "minimum" : 0.9310, "maximum" : 0.9655 }
            },
            {
                "index" : 84,
                "hscan" : { "minimum" : 0.9500, "maximum" : 1.0000 },
                "vscan" : { "minimum" : 0.8966, "maximum" : 0.9310 }
            },
            {
                "index" : 85,
                "hscan" : { "minimum" : 0.9500, "maximum" : 1.0000 },
                "vscan" : { "minimum" : 0.8621, "maximum" : 0.8966 }
            },
            {
                "index" : 86,
                "hscan" : { "minimum" : 0.9500, "maximum" : 1.0000 },
                "vscan" : { "minimum" : 0.8276, "maximum" : 0.8621 }
            },
            {
                "index" : 87,
                "hscan" : { "minimum" : 0.9500, "maximum" : 1.0000 },
                "vscan" : { "minimum" : 0.7931, "maximum" : 0.8276 }
            },
            {
                "index" : 88,
                "hscan" : { "minimum" : 0.9500, "maximum" : 1.0000 },
                "vscan" : { "minimum" : 0.7586, "maximum" : 0.7931 }
            },
            {
                "index" : 89,
                "hscan" : { "minimum" : 0.9500, "maximum" : 1.0000 },
                "vscan" : { "minimum" : 0.7241, "maximum" : 0.7586 }
            },
            {
                "index" : 90,
                "hscan" : { "minimum" : 0.9500, "maximum" : 1.0000 },
                "vscan" : { "minimum" : 0.6897, "maximum" : 0.7241 }
            },
            {
                "index" : 91,
                "hscan" : { "minimum" : 0.9500, "maximum" : 1.0000 },
                "vscan" : { "minimum" : 0.6552, "maximum" : 0.6897 }
            },
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        "endOfJson" : "endOfJson"
    }
    
    Thank you,
    Ryan
     
    Last edited: 15 October 2018
  2. Akriss

    Akriss Active Member

    Messages:
    355
    Hardware:
    RPi1/Zero, RPi2, RPi3, 32/64bit, +Arduino, +nodeMCU/ESP8266
    I have seen the same on my set up. I fairly sure the led's have trouble with lower gray levels.

    I made a test video a year ago that was just supposes to show a working system I made. However the camera was sensitive enough to see the flicker at about 14 sec in the video when the red dot starts. My eyes barely could see the flicker on normal viewing. However in that same test video at about 45 secs. the camera sees no flicker from any black/gray area, at all. I think the video codex has a bit to to with it as well maybe.


    Playing with the gamma values helped me some, but there is still a faint flicker from darker areas some times, It's not to pronounced so I live with it.

    Hope its of some help.
     
  3. Akriss

    Akriss Active Member

    Messages:
    355
    Hardware:
    RPi1/Zero, RPi2, RPi3, 32/64bit, +Arduino, +nodeMCU/ESP8266
    Also whats the power supply amp rating that you have? Could be low current causing some flicker.
     
  4. Ryan

    Ryan New Member

    Messages:
    13
    Hardware:
    RPi1/Zero, RPi3
    I dont think that has anything to do with it. When i use a full white image (max amps) I see no flickering. When I use the image with a gradient from black (top) to white (bottom) I see the flickering tho.