Add --no-video

Similar to --no-audio, add --no-video to play audio only.

Fixes #3842 <https://github.com/Genymobile/scrcpy/issues/3842>
PR #3978 <https://github.com/Genymobile/scrcpy/pull/3978>

doc/audio.md

@@ -24,6 +24,21 @@ To disable audio:
 scrcpy --no-audio
 ```
 
+## Audio only
+
+To play audio only, disable the video:
+
+```
+scrcpy --no-video
+```
+
+Without video, the audio latency is typically not criticial, so it might be
+interesting to add [buffering](#buffering) to minimize glitches:
+
+```
+scrcpy --no-video --audio-buffer=200
+```
+
 ## Codec
 
 The audio codec can be selected. The possible values are `opus` (default), `aac`

doc/recording.md

@@ -13,7 +13,11 @@ To record only the video:
 scrcpy --no-audio --record=file.mp4
 ```
 
-_It is currently not possible to record only the audio._
+To record only the audio:
+
+```bash
+scrcpy --no-video --record=file.mp4
+```
 
 To disable mirroring while recording:
 

doc/video.md

@@ -170,6 +170,16 @@ scrcpy --v4l2-sink=/dev/video2 --no-mirror
 scrcpy --record=file.mkv --no-mirror
 ```
 
+
+## No video
+
+To disable video forwarding completely, so that only audio is forwarded:
+
+```
+scrcpy --no-video
+```
+
+
 ## Video4Linux
 
 See the dedicated [Video4Linux](v4l2.md) page.