大家好
我想要尝试用mplayer来打开camera，mplayer已经安装好，mplayer解码器也已经安装，可以打开 MP4类型的文件。
连接好手机，执行adb root， adb remount 都成功后，执行命令：
mplayer tv:// -tv driver=v4l2:device=/dev/video1
提示：
MPlayer 1.3.0-4.8 (C) 2000-2016 MPlayer Team
Playing tv://.
TV file format detected.
Selected driver: v4l2
name: Video 4 Linux 2 input
author: Martin Olschewski olschewski@zpr.uni-koeln.de
comment: first try, more to come ;-)
v4l2: unable to open '/dev/video1': No such file or directory
v4l2: ioctl set mute failed: Bad file descriptor
v4l2: 0 frames successfully processed, 0 frames dropped.
请问为什么会出现这个错误，应该怎么解决
