Can we Stream Live Audio from Android phone using FFmpeg?

Im using ffmpeg_kit_flutter package to Stream data to the RTSP server in Flutter.

IOS : Working

Android : Its not working

Command Used :

'ffmpeg -f avfoundation -i ":0" -acodec aac -f rtsp -rtsp_transport tcp "$Url"'

When i ran a "ffmpeg -devices" command on android, it returns follwing response, through which i got to know android doesn't support avfoundation but android has android_camera,
Does this android_camera support audio too?

Command : 'ffmpeg -devices'

Response :

I/flutter (10620): logs:  libavutil      57. 28.100 / 57. 28.100
I/flutter (10620): logs:  libavcodec     59. 37.100 / 59. 37.100
I/flutter (10620): logs:  libavformat    59. 27.100 / 59. 27.100
I/flutter (10620): logs:  libavdevice    59.  7.100 / 59.  7.100
I/flutter (10620): logs:  libavfilter     8. 44.100 /  8. 44.100
I/flutter (10620): logs:  libswscale      6.  7.100 /  6.  7.100
I/flutter (10620): logs:  libswresample   4.  7.100 /  4.  7.100
I/flutter (10620): logs:Devices:
I/flutter (10620):  D. = Demuxing supported
I/flutter (10620):  .E = Muxing supported
I/flutter (10620):  --
I/flutter (10620): logs: D  android_camera   
I/flutter (10620): logs: D  lavfi            
I/flutter (10620): logs: DE video4linux2,v4l2

Commands which I tried in Android

FFmpegKit.execute('-y -f android_camera -i 0:1 -r 30 -c:a aac -f rtsp -rtsp_transport tcp "$Url"');

FFmpegKit.execute('-y -f android_camera -i 0:1 -r 30 -c:a libmp3lame -qscale:a 2 "/storage/emulated/0/Download/androidvideo.mp3"');

FFmpegKit.execute('-y -f android_camera -i 0:0 -r 30 -c:a wavpack -b:a 64k "/storage/emulated/0/Download/androidvideo.wav"');

This command records video but no audio in it.

FFmpegKit.execute('-video_size hd720 -f android_camera -camera_index 1 -i anything -r 10 -t 00:00:15 "$dir/androidvideo.mp4”');

the android_camera input device in FFmpeg for Android does not support audio capture. It only captures video from the Android camera but does not capture audio from the device's microphone.

As seen in the following sources, ffmpeg for Android supports only video capturing from the camera using the android_camera device:

• https://stackoverflow.com/questions/62194826/how-to-use-ffmpeg-read-realtime-microphone-audio-volume
• https://github.com/tanersener/mobile-ffmpeg/issues/153

Though on iOS the avfoundation supports video and audio.

As an option, the audio could be recorded by the native means, MediaRecorder or AAudio / OpenSL ES via JNI for example,
and then mixed with the video recorded from the camera.

The ffmpeg would take audio data from an audio buffer (a temp file as a simplest option or a in-memory buffer, but this would need to be investigated further for how to configure it in the call string).