234 lines
6.4 KiB
Markdown
234 lines
6.4 KiB
Markdown
# Frequently Asked Questions
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[Read in another language](#translations)
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Here are the common reported problems and their status.
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If you encounter any error, the first step is to upgrade to the latest version.
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## `adb` and USB issues
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`scrcpy` execute `adb` commands to initialize the connection with the device. If
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`adb` fails, then scrcpy will not work.
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This is typically not a bug in _scrcpy_, but a problem in your environment.
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### `adb` not found
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You need `adb` accessible from your `PATH`.
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On Windows, the current directory is in your `PATH`, and `adb.exe` is included
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in the release, so it should work out-of-the-box.
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### Device not detected
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> ERROR: Could not find any ADB device
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Check that you correctly enabled [adb debugging][enable-adb].
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Your device must be detected by `adb`:
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```
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adb devices
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```
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If your device is not detected, you may need some [drivers] (on Windows). There is a separate [USB driver for Google devices][google-usb-driver].
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[enable-adb]: https://developer.android.com/studio/command-line/adb.html#Enabling
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[drivers]: https://developer.android.com/studio/run/oem-usb.html
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[google-usb-driver]: https://developer.android.com/studio/run/win-usb
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### Device unauthorized
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> ERROR: Device is unauthorized:
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> ERROR: --> (usb) 0123456789abcdef unauthorized
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> ERROR: A popup should open on the device to request authorization.
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When connecting, a popup should open on the device. You must authorize USB
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debugging.
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If it does not open, check [stackoverflow][device-unauthorized].
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[device-unauthorized]: https://stackoverflow.com/questions/23081263/adb-android-device-unauthorized
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### Several devices connected
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If several devices are connected, you will encounter this error:
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> ERROR: Multiple (2) ADB devices:
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> ERROR: --> (usb) 0123456789abcdef device Nexus_5
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> ERROR: --> (tcpip) 192.168.1.5:5555 device GM1913
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> ERROR: Select a device via -s (--serial), -d (--select-usb) or -e (--select-tcpip)
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In that case, you can either provide the identifier of the device you want to
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mirror:
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```bash
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scrcpy -s 0123456789abcdef
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```
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Or request the single USB (or TCP/IP) device:
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```bash
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scrcpy -d # USB device
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scrcpy -e # TCP/IP device
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```
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Note that if your device is connected over TCP/IP, you might get this message:
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> adb: error: more than one device/emulator
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> ERROR: "adb reverse" returned with value 1
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> WARN: 'adb reverse' failed, fallback to 'adb forward'
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This is expected (due to a bug on old Android versions, see [#5]), but in that
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case, scrcpy fallbacks to a different method, which should work.
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[#5]: https://github.com/Genymobile/scrcpy/issues/5
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### Conflicts between adb versions
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> adb server version (41) doesn't match this client (39); killing...
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This error occurs when you use several `adb` versions simultaneously. You must
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find the program using a different `adb` version, and use the same `adb` version
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everywhere.
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You could overwrite the `adb` binary in the other program, or ask _scrcpy_ to
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use a specific `adb` binary, by setting the `ADB` environment variable:
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```bash
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# in bash
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export ADB=/path/to/your/adb
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scrcpy
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```
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```cmd
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:: in cmd
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set ADB=C:\path\to\your\adb.exe
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scrcpy
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```
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```powershell
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# in PowerShell
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$env:ADB = 'C:\path\to\your\adb.exe'
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scrcpy
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```
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### Device disconnected
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If _scrcpy_ stops itself with the warning "Device disconnected", then the
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`adb` connection has been closed.
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Try with another USB cable or plug it into another USB port. See [#281] and
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[#283].
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[#281]: https://github.com/Genymobile/scrcpy/issues/281
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[#283]: https://github.com/Genymobile/scrcpy/issues/283
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## HID/OTG issues on Windows
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On Windows, if `scrcpy --otg` (or `--hid-keyboard`/`--hid-mouse`) results in:
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> ERROR: Could not find any USB device
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(or if only unrelated USB devices are detected), there might be drivers issues.
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Please read [#3654], in particular [this comment][#3654-comment1] and [the next
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one][#3654-comment2].
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[#3654]: https://github.com/Genymobile/scrcpy/issues/3654
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[#3654-comment1]: https://github.com/Genymobile/scrcpy/issues/3654#issuecomment-1369278232
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[#3654-comment2]: https://github.com/Genymobile/scrcpy/issues/3654#issuecomment-1369295011
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## Control issues
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### Mouse and keyboard do not work
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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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Rebooting the device is necessary once this option is set.
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[simulating input]: https://github.com/Genymobile/scrcpy/issues/70#issuecomment-373286323
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### Special characters do not work
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The default text injection method is [limited to ASCII characters][text-input].
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A trick allows to also inject some [accented characters][accented-characters],
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but that's all. See [#37].
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Since scrcpy v1.20, it is possible to simulate a [physical keyboard][hid] (HID).
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[text-input]: https://github.com/Genymobile/scrcpy/issues?q=is%3Aopen+is%3Aissue+label%3Aunicode
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[accented-characters]: https://blog.rom1v.com/2018/03/introducing-scrcpy/#handle-accented-characters
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[#37]: https://github.com/Genymobile/scrcpy/issues/37
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[hid]: README.md#physical-keyboard-simulation-hid
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## Client issues
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### Issue with Wayland
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By default, SDL uses x11 on Linux. The [video driver] can be changed via the
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`SDL_VIDEODRIVER` environment variable:
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[video driver]: https://wiki.libsdl.org/FAQUsingSDL#how_do_i_choose_a_specific_video_driver
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```bash
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export SDL_VIDEODRIVER=wayland
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scrcpy
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```
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On some distributions (at least Fedora), the package `libdecor` must be
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installed manually.
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See issues [#2554] and [#2559].
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[#2554]: https://github.com/Genymobile/scrcpy/issues/2554
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[#2559]: https://github.com/Genymobile/scrcpy/issues/2559
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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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## Crashes
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### Exception
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If you get any exception related to `MediaCodec`:
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```
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ERROR: Exception on thread Thread[main,5,main]
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java.lang.IllegalStateException
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at android.media.MediaCodec.native_dequeueOutputBuffer(Native Method)
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```
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then try with another [encoder](doc/video.md#codec).
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## Translations
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Translations of this FAQ in other languages are available in the [wiki].
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[wiki]: https://github.com/Genymobile/scrcpy/wiki
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Only this README file is guaranteed to be up-to-date.
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