android 截图,视频录制命令 screencap screenrecord screenshot

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时间限制视频录制：
screenrecord  --time-limit 20 /sdcard/demo.mp4

抓屏：
screencap -p /sdcard/screen.png
screenshot /sdcard/screen.png

视频录制命令screenrecord
 # screenrecord --help                                           
Usage: screenrecord [options] <filename>


Records the device's display to a .mp4 file.


Options:
--size WIDTHxHEIGHT
    Set the video size, e.g. "1280x720".  Default is the device's main
    display resolution (if supported), 1280x720 if not.  For best results,
    use a size supported by the AVC encoder.
--bit-rate RATE
    Set the video bit rate, in megabits per second.  Default 4Mbps.
--time-limit TIME
    Se

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