Question

我正在使用JMF连接到USB连接的网络摄像头（Logitech Quickcam Pro 9000）。这款相机能够以最高2MP的速度提供视频，但是我无法将视频格式设置为高于320x240的视频格式。打印可用的格式给我这个结果：

MJPG, 320x240, Length=230400 0 extra bytes
YUV Video Format: Size = java.awt.Dimension[width=160,height=120] MaxDataLength = 38400 DataType = class [B yuvType = 32 StrideY = 320 StrideUV = 320 OffsetY = 0 OffsetU = 1 OffsetV = 3
YUV Video Format: Size = java.awt.Dimension[width=176,height=144] MaxDataLength = 50688 DataType = class [B yuvType = 32 StrideY = 352 StrideUV = 352 OffsetY = 0 OffsetU = 1 OffsetV = 3
YUV Video Format: Size = java.awt.Dimension[width=320,height=240] MaxDataLength = 153600 DataType = class [B yuvType = 32 StrideY = 640 StrideUV = 640 OffsetY = 0 OffsetU = 1 OffsetV = 3
YUV Video Format: Size = java.awt.Dimension[width=352,height=288] MaxDataLength = 202752 DataType = class [B yuvType = 32 StrideY = 704 StrideUV = 704 OffsetY = 0 OffsetU = 1 OffsetV = 3
YUV Video Format: Size = java.awt.Dimension[width=640,height=480] MaxDataLength = 614400 DataType = class [B yuvType = 32 StrideY = 1280 StrideUV = 1280 OffsetY = 0 OffsetU = 1 OffsetV = 3

MJPG, 160x120, Length=57600 0 extra bytes
MJPG, 176x144, Length=76032 0 extra bytes
MJPG, 352x288, Length=304128 0 extra bytes
MJPG, 640x480, Length=921600 0 extra bytes

这告诉我，我至少应该能够捕获640x480，但我甚至无法让它工作。我该如何告诉JMF我想要使用什么分辨率？

这是我现在的代码的摘录：

captureDeviceInfo = CaptureDeviceManager.getDevice(DEVICE_NAME);
Format[] formats = captureDeviceInfo.getFormats();
Format selectedFormat = null;
for(Format f : formats) {
    if(f.toString().contains("width=640,height=480")) {
        selectedFormat = f;
        break;
    }
}

try {
    mediaLocator = captureDeviceInfo.getLocator();
    DataSource videoDataSource = Manager.createDataSource(mediaLocator);
    player = Manager.createRealizedPlayer(videoDataSource);

    FormatControl fc = (FormatControl)player.getControl("javax.media.control.FormatControl");
    fc.setFormat(selectedFormat);

    player.start();

Answer 1

仔细检查所需的格式字符串。至少在我的机器上，没有格式字符串包含“width = 640，height = 480”。当我循环浏览支持的格式时，它们都以“RGB，640x480，长度= ...”或“YUV视频格式：大小= ...”开头

使用Java（JMF）设置网络摄像头分辨率

1 个答案: