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91 lines
2.4 KiB
Markdown
91 lines
2.4 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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## 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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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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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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## Bit rate
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The default video 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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