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# Frequently Asked Questions
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Here are the common reported problems and their status.
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### On Windows, my device is not detected
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The most common is your device not being detected by `adb`, or is unauthorized.
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Check everything is ok by calling:
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adb devices
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Windows may need some [drivers] to detect your device.
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[drivers]: https://developer.android.com/studio/run/oem-usb.html
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### I can only mirror, I cannot interact with the device
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On some devices, you may need to enable an option to allow [simulating input].
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In developer options, enable:
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> **USB debugging (Security settings)**
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> _Allow granting permissions and simulating input via USB debugging_
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[simulating input]: https://github.com/Genymobile/scrcpy/issues/70#issuecomment-373286323
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### Mouse clicks at wrong location
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On MacOS, with HiDPI support and multiple screens, input location are wrongly
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scaled. See [issue 15].
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[issue 15]: https://github.com/Genymobile/scrcpy/issues/15
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A workaround is to build with HiDPI support disabled:
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```bash
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meson x --buildtype release -Dhidpi_support=false
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```
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However, the video will be displayed at lower resolution.
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### The quality is low on HiDPI display
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On Windows, you may need to configure the [scaling behavior].
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> `scrcpy.exe` > Properties > Compatibility > Change high DPI settings >
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> Override high DPI scaling behavior > Scaling performed by: _Application_.
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[scaling behavior]: https://github.com/Genymobile/scrcpy/issues/40#issuecomment-424466723
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### KWin compositor crashes
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On Plasma Desktop, compositor is disabled while _scrcpy_ is running.
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As a workaround, [disable "Block compositing"][kwin].
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[kwin]: https://github.com/Genymobile/scrcpy/issues/114#issuecomment-378778613
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### I get an error "Could not open video stream"
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There may be many reasons. One common cause is that the hardware encoder of your
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device is not able to encode at the given definition:
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```
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ERROR: Exception on thread Thread[main,5,main]
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android.media.MediaCodec$CodecException: Error 0xfffffc0e
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...
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Exit due to uncaughtException in main thread:
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ERROR: Could not open video stream
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INFO: Initial texture: 1080x2336
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```
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Just try with a lower definition:
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```
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scrcpy -m 1920
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scrcpy -m 1024
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scrcpy -m 800
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```
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