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scrcpy v1.19

Changes since v1.18:

• Implement (optional) buffering (#2464)
• Make --turn-screen-off work even if --no-display (#2426)
• Workaround Windows issue with non-ASCII path (#2619)
• Print correct error messages on Windows socket errors (#2624)
• Upgrade platform-tools to 31.0.3 (adb) in Windows releases (#2588)
• Upgrade SDL to 2.0.16 in Windows releases (#2589)
• Various technical fixes

Highlights

Buffering

This release brings a new feature to buffer the video stream for a given delay. This is especially useful for removing a source of stuttering for live-streaming.

To minimize latency, scrcpy was to always display a frame as soon as it is available, without waiting. This design decision is (on purpose) at the cost of jitter: the delay between frames is not preserved. Note that this does not impact recording (--record), which writes the timestamps captured on the device.

However, some real-time use cases may benefit from compensating for jitter, by adding a small latency. For example, few tens of seconds of latency for live-streaming are not important, but jitter is noticeable. The may also improve the mirroring of a video playback.

For this purpose, scrcpy v1.19 introduces two new options:

scrcpy --display-buffer=50  # add 50 ms buffering for display
scrcpy --v4l2-buffer=500    # add 500 ms buffering for v4l2 sink

In practice, here is a graph showing the difference in smoothness with a buffer of 50ms on a wireless connection:

TL;DR: if you use scrcpy for live-streaming on Linux, use v4l2 with some buffering, and capture the V4L2 source via OBS:

scrcpy -b20M --no-display --v4l2-sink=/dev/video2 --v4l2-buffer=100

On other platforms, as a fallback, run scrcpy with some display buffer, then capture the window via OBS:

scrcpy -b20M --display-buffer=100