嵌入式视频采集软件需要实现视频流的采集，视频显示，利用V4L2（video
for linux2）、FrameBuffer提供的应用程序接口实现，需要对摄像头、显示屏进行操作。USB摄像头、LCD显示屏都属于字符设备，分别为/dev/video0、/dev/fb0文件。本代码即利用这些基本知识实现视频采集
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001284s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.092199s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001251s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001886s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001230s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003719s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001093s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003210s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014912s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001398s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 306995 [ RunTime:0.001289s ]
