Identical VideoCharacteristics except for FPS leads to one uncompressed image and one compressed image

[tank104]

I have two identical VideoCharacteristics but the higher frame rate (5/2) produces uncompressed high quality image and the lower frame rate (1/1) produces compressed lower quality image.

Code example:

    var videoCharacteristic = new VideoCharacteristics(
        PixelFormats.YUYV,
        2592, 1944,
        new Fraction(5, 2),
        "YUY2", true,
        "32595559-0000-0010-8000-00aa00389b71");

    byte[] imageData = await deviceInfo.TakeOneShotAsync(
       videoCharacteristic);


    Console.WriteLine($"Width: {videoCharacteristic.Width}, Height: {videoCharacteristic.Height}, " +
                      $"PixelFormat: {videoCharacteristic.PixelFormat}, IsCompression: {videoCharacteristic.IsCompression}");
    Console.WriteLine($"Image1 data length: {imageData.Length}");

    // Save to file
    await File.WriteAllBytesAsync("oneshot1.bmp", imageData);

    videoCharacteristic = new VideoCharacteristics(
        PixelFormats.YUYV,
        2592, 1944,
        new Fraction(1, 1),
        "YUY2", true,
        "32595559-0000-0010-8000-00aa00389b71");

    imageData = await deviceInfo.TakeOneShotAsync(
       videoCharacteristic);//, TranscodeFormats.DoNotTranscode);

    // Save to file
    await File.WriteAllBytesAsync("oneshot2.bmp", imageData);

    Console.WriteLine($"Width: {videoCharacteristic.Width}, Height: {videoCharacteristic.Height}, " +
                      $"PixelFormat: {videoCharacteristic.PixelFormat}, IsCompression: {videoCharacteristic.IsCompression}");
    Console.WriteLine($"Image2 data length: {imageData.Length}");

Output looks like:

Width: 2592, Height: 1944, PixelFormat: YUYV, IsCompression: False
Image1 data length: 15116598
Width: 2592, Height: 1944, PixelFormat: YUYV, IsCompression: False
Image2 data length: 484803

Is this an issue with the camera or with FlashCap? Can I do anything to help debug or sort the issue?