我有一个捕获屏幕视频并将其保存到文件的应用程序。我为用户提供了在480、720和“全屏”视频尺寸之间进行选择的能力。 480将记录在屏幕上的一个小盒子中，720将记录在一个较大的盒子中，当然，“全屏”将记录在一个更大的盒子中。但是，此全屏框不是实际的屏幕分辨率。它是应用程序窗口的大小，恰好在1700x800左右。视频工具可完美地用于480和720选项，如果“全屏”被覆盖为1920x1080的整个屏幕，则视频工具也将正常工作。
我的问题：只允许某些尺寸吗？它是否必须适合某个长宽比，或者是“可接受的”分辨率？下面的代码是从xuggle CaptureScreenToFile.java文件修改的（问题的位置通过注释指出）：
public void run() {
try {
String parent = "Videos";
String outFile = parent + "example" + ".mp4";
file = new File(outFile);
// This is the robot for taking a snapshot of the screen. It's part of Java AWT
final Robot robot = new Robot();
final Rectangle customResolution = where; //defined resolution (custom record size - in this case, 1696x813)
final Toolkit toolkit = Toolkit.getDefaultToolkit();
final Rectangle fullResolution = new Rectangle(toolkit.getScreenSize()); //full resolution (1920x1080)
// First, let's make a IMediaWriter to write the file.
final IMediaWriter writer = ToolFactory.makeWriter(outFile);
writer.setForceInterleave(false);
// We tell it we're going to add one video stream, with id 0,
// at position 0, and that it will have a fixed frame rate of
// FRAME_RATE.
writer.addVideoStream(0, 0, FRAME_RATE, customResolution.width, customResolution.height); //if I use fullResolution, it works just fine - but captures more of the screen than I want.
// Now, we're going to loop
long startTime = System.nanoTime();
while (recording) {
// take the screen shot
BufferedImage screen = robot.createScreenCapture(fullResolution); //tried capturing using customResolution, but did not work. Instead, this captures full screen, then tries to trim it below (also does not work).
// convert to the right image type
BufferedImage bgrScreen = convertToType(screen, BufferedImage.TYPE_3BYTE_BGR); //Do I need to convert after trimming?
BufferedImage trimmedScreen = bgrScreen.getSubimage((int)customResolution.getX(), (int)customResolution.getY(), (int)customResolution.getWidth(), (int)customResolution.getHeight());
// encode the image
try{
//~~~~Problem is this line of code!~~~~ Error noted below.
writer.encodeVideo(0, trimmedScreen, System.nanoTime() - startTime, TimeUnit.NANOSECONDS); //tried using trimmedScreen and bgrScreen
} catch (Exception e) {
e.printStackTrace();
}
// sleep for framerate milliseconds
Thread.sleep((long) (1000 / FRAME_RATE.getDouble()));
}
// Finally we tell the writer to close and write the trailer if
// needed
writer.close();
} catch (Throwable e) {
System.err.println("an error occurred: " + e.getMessage());
}
}
public static BufferedImage convertToType(BufferedImage sourceImage, int targetType) {
BufferedImage image;
// if the source image is already the target type, return the source image
if (sourceImage.getType() == targetType)
image = sourceImage;
// otherwise create a new image of the target type and draw the new image
else {
image = new BufferedImage(sourceImage.getWidth(), sourceImage.getHeight(), targetType);
image.getGraphics().drawImage(sourceImage, 0, 0, null);
}
return image;
}
错误：
java.lang.RuntimeException：无法打开流com.xuggle.xuggler.IStream@2834912 [index：0; id：0; streamcoder：com.xuggle.xuggler.IStreamCoder@2992432 [codec = com.xuggle.xuggler.ICodec @ 2930320 [type = CODEC_TYPE_VIDEO; id = CODEC_ID_H264; name = libx264;];时基= 1/50;帧频== 0/0;像素类型= YUV420P;宽度= 1696;高度= 813;];帧频：0/0 ; timebase：1/90000; direction：OUTBOUND;]：不允许操作
注意：该文件已成功创建，但大小为零，并且无法由Windows Media Player打开，并显示以下错误文本：
Windows Media Player无法播放文件。播放器可能不支持文件类型，或者可能不支持用于压缩文件的编解码器。
对不起罗y的问题。我对学习“什么”和“为什么”感兴趣，而不仅仅是解决方案。因此，如果有人可以解释为什么它不起作用，或者向我指出可以提供帮助的材料，我将不胜感激。谢谢！
最佳答案
尝试使尺寸为偶数1696x812