使用adb screenrecord命令通过USB将Android屏幕镜像到PC [英] Use adb screenrecord command to mirror Android screen to PC via USB

问题描述

我尝试了 fadden 的建议，将Android屏幕镜像到PC，但是vlc播放器屏幕什么也没显示：

I've tried the suggestion from fadden to mirror the Android screen to PC, but the vlc player screen show nothing:

此功能的正确命令行是什么？谢谢。

What would be the correct commands lines for this function? Thanks.

推荐答案

我不记得我用于初始测试的vlc命令行了。我最近在台式机Linux（Ubuntu 15.10）上尝试了一些其他操作。

I don't remember the vlc command line that I used for the initial testing. I've tried a few different things recently, on desktop Linux (Ubuntu 15.10).

VLC

如果仅将输出通过管道传输到 vlc --demux h264-，它似乎可以正常工作，但是您逐渐落后了。添加-h264-fps = 60 似乎有帮助，但是您开始遇到错误（ ES_OUT_SET_（GROUP_）PCR的调用太晚了）。添加-clock-jitter = 0 似乎可以减轻错误的影响，但仍然很混乱。

If you just pipe the output into vlc --demux h264 -, it appears to work, but you get gradually farther behind. Adding --h264-fps=60 seems to help that, but you start getting errors ("ES_OUT_SET_(GROUP_)PCR is called too late"). Adding --clock-jitter=0 seems to make the errors less traumatic, but it's still pretty messed up.

ffplay

一个简单的 ffplay-可行，但似乎要花一些时间决定开始的秒数，最后却落后于整个时间。

A simple ffplay - works, but it seems to take a few seconds to decide to start, and ends up lagging well behind the entire time.

使用 ffplay -framerate 60 -framedrop -bufsize 16M-可以提供相当长一段时间的不错的质量。这是由于以下命令同步了帧率和比特率，因为视频将另外尝试以30fps的速度播放，由于额外的帧，随着时间的推移，一切看起来/变得越来越慢。然后，比特率将有助于使视频尽可能保持最佳定时。 我发现它可以在100-1000MS的延迟内运行；与大多数蓝牙耳机类似。 您可能会收到考虑增加探针大小错误，该错误可能会冻结流。最好重新启动屏幕记录或尝试附加 -probesize 16M

Using ffplay -framerate 60 -framedrop -bufsize 16M - gives you a decent quality that lasts for quite a while. This is due to the below command that synchronises the framerate and bitrate as the video will otherwise be trying to play at 30fps making everything look/get slower over time due to the extra frames. The bitrate will then help keep the video properly timed as best as possible. I've found it works within a 100-1000MS delay; similarly to most Bluetooth headsets. You might get a "consider increasing probesize" error that may freeze the stream. It's best to restart screenrecord or try appending -probesize 16M

注意：使用ffplay进行的此配置可与预先通过管道传递的以下adb命令一起使用。如果您正在执行GPU密集型任务或使用较旧的手机，建议使用 1280x720 的尺寸。如果您的电话不支持60fps（或似乎不以60fps录制），请更改为适当的值，例如30或24。

Note: This configuration with ffplay works with the following adb command piped beforehand. If you're running GPU intensive tasks or using an older phone, a size of 1280x720 is a better recommendation. If your phone doesn't support 60fps (or doesn't seem to record in 60fps) change until appropriate with values such as 30 or 24.

adb exec-out screenrecord --bit-rate = 16m --output-format = h264 --size 1920x1080-

mplayer

命令 mplayer -demuxer h264es-似乎产生了最佳结果。立即启动，几乎没有延迟，而且不会像vlc那样异常。

The command mplayer -demuxer h264es - seems to yield the best results. Starts immediately, very little delay, and doesn't freak out like vlc.

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