What is the best option for scrcpy to get screenshot of device every 200ms or 500ms?

[S-YOU]

• I'm currently using screencapture on my Mac, but looking for native options from scrcpy.
• adb exec-out screencap took 1.5s on my environment so it is not the option

[rom1v]

There is no "screenshot" feature implemented/merged (see #2040 #684).

However, if you want a "screenshot" every 200ms, you could record a video at 5 fps:

scrcpy --fps=5 --record=video.mkv

(then convert the video to images using ffmpeg)

[S-YOU]

Thank you very much for the information and the hint, --fps option would reduce the file pretty much.

[S-YOU]

--fps you meant is --max-fps? I somehow seeing that --max-fps=1 or 2 still seeing output of 7~10 fps with --print-fps option.

EDIT: I am seeing 19.92 fps with --max-fps 1 , is there a way to limit it somehow?

  Metadata:
    COMMENT         : Recorded by scrcpy 1.24
    ENCODER         : Lavf59.16.100
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #0:0: Video: h264 (High), yuv420p(progressive), 1024x456, 19.92 tbr, 1k tbn

[rom1v]

--fps you meant is --max-fps?

Yes, sorry, --max-fps.

I somehow seeing that --max-fps=1 or 2 still seeing output of 7~10 fps with --print-fps option.

Indeed, that's surprising.

But in fact, it's due to KEY_REPEAT_PREVIOUS_FRAME_AFTER (here), which repeats a frame (after 100ms as configured) when no new frame is produced, to recover from possibly bad quality on a static frame. It's not entirely clear to me why it's does not always produce 10fps then, but maybe it avoids a new frame if it brings no changed compared to the previous encoded+decoded one.

You could disable this option by overriding the MediaCodec option:

scrcpy --max-fps=2 --print-fps --codec-options=repeat-previous-frame-after:long=0

You will not get more than 2 fps (sometimes 3 due to how it's measured by intervals on the client side, but never more).

I am seeing 19.92 fps with --max-fps 1 , is there a way to limit it somehow?

The framerate is variable, and typically badly calculated by ffmpeg when it lists the file properties.

[S-YOU]

scrcpy --max-fps=2 --print-fps --codec-options=repeat-previous-frame-after:string=0

Thank you very much, that worked!

Also, I've hacked into decoder.c and figured a quick and dirty way to dump screenshots directly there.
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