Qtwebengine Quicknano Has No Sound In Embedded Linux

I have compiled QtWebEngine into my i.MX6 embedded device. When I tried to play youtube Video with quicknanobrowser, the video plays but there would be no sound. In fact, there i

Solution 1:

You need to force QtWebEngine to use ALSA. In embedded systems, it is disabled by default.

In qt5.7/qtwebengine/src/3rdparty/chromium/media/media.gyp, there is a test to check if we are on an embedded system:

# Enable ALSA and Pulse for runtime selection.
  ['(OS=="linux" or OS=="freebsd" or OS=="solaris") and ((embedded!=1 and chromecast==0) or is_cast_desktop_build==1)', {
    # ALSA is always needed for Web MIDI even if the cras is enabled.'use_alsa%': 1,
    'conditions': [
      ['use_cras==1', {
        'use_pulseaudio%': 0,
      }, {
        'use_pulseaudio%': 1,
      }],
    ],
  }, {
    'use_alsa%': 0,
    'use_pulseaudio%': 0,
  }],

I changed last use_alsa% to 1 and in qt5.7/qtwebengine/src/core/config/embedded_linux.pri, I added a new flag:

use_alsa=1

With this settings I have audio on my embedded ARM Linux and with flag:

enable_webrtc=1

I am able to start a WebRTC session with video and audio.