做视频采集：
tiny6410 + qt4.7.0 +中星微USB摄像头
程序中仅开了一个定时器 定时200ms
在paintEvent事件中
用QPixmap 画图。
结果显示出来的图像 比较杂乱、错位、叠加 很严重，
。。。
哗啦啦
。。。。
Corrupt JPEG data: 8 extraneous bytes before marker 0xd9
Corrupt JPEG data: premature end of data segment
Corrupt JPEG data: premature end of data segment
Corrupt JPEG data: premature end of data segment
Corrupt JPEG data: premature end of data segment
Corrupt JPEG data: 157 extraneous bytes before marker 0xd9
Corrupt JPEG data: premature end of data segment
Corrupt JPEG data: premature end of data segment
Corrupt JPEG data: premature end of data segment
Corrupt JPEG data: premature end of data segment
Corrupt JPEG data: 4 extraneous bytes before marker 0xd9
Corrupt JPEG data: 10 extraneous bytes before marker 0xd9
Corrupt JPEG data: premature end of data segment
Corrupt JPEG data: premature end of data segment
Corrupt JPEG data: 7 extraneous bytes before marker 0xd9
Corrupt JPEG data: premature end of data segment
Corrupt JPEG data: 47 extraneous bytes before marker 0xd9
Corrupt JPEG data: 4 extraneous bytes before marker 0xd9
Corrupt JPEG data: premature end of data segment
Corrupt JPEG data: 66 extraneous bytes before marker 0xd9
Corrupt JPEG data: premature end of data segment
