146 lines
3.6 KiB
Markdown
146 lines
3.6 KiB
Markdown
# Audio
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Audio forwarding is supported for devices with Android 11 or higher, and it is
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enabled by default:
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- For **Android 12 or newer**, it works out-of-the-box.
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- For **Android 11**, you'll need to ensure that the device screen is unlocked
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when starting scrcpy. A fake popup will briefly appear to make the system
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think that the shell app is in the foreground. Without this, audio capture
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will fail.
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- For **Android 10 or earlier**, audio cannot be captured and is automatically
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disabled.
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If audio capture fails, then mirroring continues with video only (since audio is
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enabled by default, it is not acceptable to make scrcpy fail if it is not
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available), unless `--require-audio` is set.
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## No audio
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To disable audio:
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```
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scrcpy --no-audio
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```
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To disable only the audio playback, see [no playback](video.md#no-playback).
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## Audio only
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To play audio only, disable the video:
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```bash
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scrcpy --no-video
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# interrupt with Ctrl+C
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```
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Without video, the audio latency is typically not criticial, so it might be
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interesting to add [buffering](#buffering) to minimize glitches:
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```
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scrcpy --no-video --audio-buffer=200
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```
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## Source
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By default, the device audio output is forwarded.
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It is possible to capture the device microphone instead:
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```
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scrcpy --audio-source=mic
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```
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For example, to use the device as a dictaphone and record a capture directly on
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the computer:
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```
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scrcpy --audio-source=mic --no-video --no-playback --record=file.opus
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```
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## Codec
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The audio codec can be selected. The possible values are `opus` (default), `aac`
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and `raw` (uncompressed PCM 16-bit LE):
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```bash
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scrcpy --audio-codec=opus # default
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scrcpy --audio-codec=aac
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scrcpy --audio-codec=raw
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```
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In particular, if you get the following error:
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> Failed to initialize audio/opus, error 0xfffffffe
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then your device has no Opus encoder: try `scrcpy --audio-codec=aac`.
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For advanced usage, to pass arbitrary parameters to the [`MediaFormat`],
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check `--audio-codec-options` in the manpage or in `scrcpy --help`.
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[`MediaFormat`]: https://developer.android.com/reference/android/media/MediaFormat
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## Encoder
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Several encoders may be available on the device. They can be listed by:
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```bash
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scrcpy --list-encoders
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```
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To select a specific encoder:
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```
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scrcpy --audio-codec=opus --audio-encoder='c2.android.opus.encoder'
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```
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## Bit rate
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The default audio bit rate is 128Kbps. To change it:
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```bash
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scrcpy --audio-bit-rate=64K
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scrcpy --audio-bit-rate=64000 # equivalent
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```
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_This parameter does not apply to RAW audio codec (`--audio-codec=raw`)._
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## Buffering
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Audio buffering is unavoidable. It must be kept small enough so that the latency
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is acceptable, but large enough to minimize buffer underrun (causing audio
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glitches).
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The default buffer size is set to 50ms. It can be adjusted:
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```bash
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scrcpy --audio-buffer=40 # smaller than default
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scrcpy --audio-buffer=100 # higher than default
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```
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Note that this option changes the _target_ buffering. It is possible that this
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target buffering might not be reached (on frequent buffer underflow typically).
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If you don't interact with the device (to watch a video for example), a higher
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latency (for both [video](video.md#buffering) and audio) might be preferable to
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avoid glitches and smooth the playback:
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```
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scrcpy --display-buffer=200 --audio-buffer=200
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```
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It is also possible to configure another audio buffer (the audio output buffer),
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by default set to 5ms. Don't change it, unless you get some [robotic and glitchy
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sound][#3793]:
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```bash
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# Only if absolutely necessary
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scrcpy --audio-output-buffer=10
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```
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[#3793]: https://github.com/Genymobile/scrcpy/issues/3793
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