OnPixelBufferArrived can not get new YUYV buffer in v1.10.0 （v1.9.0 is ok）

[yangjieshao]

when videoCharacteristic.PixelFormat is YUYV

OS: windows 10 PixelFormat: YUYV Version: 1.10.0

打断点查看数据的话，一切正常 (If you view data in breakpoint, everything is ok) 但是一但正常运行 (But once it runs normally)

在 1.9.0 中一切正常 (everything is ok in 1.9.0)

在 1.10.0 中 每次获取的数据都是旧数据（事实上每次获取的都是第一帧数据） (In 1.10.0, each data obtained is old data) [(In fact, every time we obtain the first frame of data)]

this is my sample ConsoleApp1.zip

private static ArraySegment<byte> _lastImageBuffer;
private static string _lastConsoleMsg = string.Empty;
private static readonly string sameMsg = "same image buffer";
private static readonly string newMsg = "new image buffer";
private static void OnPixelBufferArrived(PixelBufferScope bufferScope)
{
    var imageBuffer = bufferScope.Buffer.ReferImage();
    if (EqualityComparer<ArraySegment<byte>>.Default.Equals(_lastImageBuffer, imageBuffer))
    {
        Debug.WriteLine(sameMsg);
        if(_lastConsoleMsg!= sameMsg)
        {
            Console.WriteLine(sameMsg);
            _lastConsoleMsg = sameMsg;
        }
    }
    else
    {
        _lastImageBuffer = imageBuffer;
        Debug.WriteLine(newMsg);
        if (_lastConsoleMsg != newMsg)
        {
            Console.WriteLine(newMsg);
            _lastConsoleMsg = newMsg;
        }
    }
}

[yangjieshao]

1.10.0

1.9.0

[Muny]

Can you print the list of descriptors and characteristics you discover on your system on v1.9.0 and v1.10.0 using:

using FlashCap;

// Capture device enumeration:
var devices = new CaptureDevices();

foreach (var descriptor in devices.EnumerateDescriptors())
{
    // "Logicool Webcam C930e: DirectShow device, Characteristics=34"
    // "Default: VideoForWindows default, Characteristics=1"
    Console.WriteLine(descriptor);

    foreach (var characteristics in descriptor.Characteristics)
    {
        // "1920x1080 [JPEG, 30fps]"
        // "640x480 [YUYV, 60fps]"
        Console.WriteLine(characteristics);
    }
}

[yangjieshao]

Can you print the list of descriptors and characteristics you discover on your system on v1.9.0 and v1.10.0 using:

using FlashCap;

// Capture device enumeration:
var devices = new CaptureDevices();

foreach (var descriptor in devices.EnumerateDescriptors())
{
    // "Logicool Webcam C930e: DirectShow device, Characteristics=34"
    // "Default: VideoForWindows default, Characteristics=1"
    Console.WriteLine(descriptor);

    foreach (var characteristics in descriptor.Characteristics)
    {
        // "1920x1080 [JPEG, 30fps]"
        // "640x480 [YUYV, 60fps]"
        Console.WriteLine(characteristics);
    }
}

used same device same videoCharacteristic in 1.9.0 and 1.10.0 800x448 [YUYV,25fps]

[kekyo]

I haven't followed it in detail yet, but maybe the instances are identical, but the data inside is changing?

It is possible that EqualityComparer<ArraySegment<byte>>.Default.Equals() is not inspecting the contents of the array byte[] inside ArraySegment<byte>. I assume this is because the buffer pool was introduced in 1.10.0, so the same array instance is returned.

[yangjieshao]

It seems you are right