VLC 2.2.3, python-vlc 1.1.2.
I have a virtual audio output and am trying to get libVLC to output on it. So far, I can see the virtual output appearing in libVLC, but selecting it makes audio play on the default output (i.e. the speakers).
This is the relevant part of what I have:
self.Instance = vlc.Instance() self.player = self.Instance.media_player_new() devices = [] mods = self.player.audio_output_device_enum() if mods: mod = mods while mod: mod = mod.contents devices.append(mod.device) mod = mod.next vlc.libvlc_audio_output_device_list_release(mods) # this is the part I change on each run of the code. self.player.audio_output_device_set(None, devices[0])
I’ve run the code multiple times, changing the device ID as per the code comment. However, the output device doesn’t actually change. This is a headache for two reasons:
1) audio_output_device_set() doesn’t return anything. I can’t tell if I’m actually accomplishing anything when I run this function. 2) I can’t even run audio_output_device_get() to check if the set function is doing anything as this is only for libvlc 3. I would prefer for my program to work with 2.2.3.
So, what I did next was install VLC 3.0 and run the above code with it. Now, audio_output_device_get() works and I can see that the set function is actually changing the output device to the virtual output. But sound STILL plays on the speakers.
What’s going on? How do I fix this?
I asked at the VLC forums and got a singularly unhelpful reply telling me to ‘check logs and documentation’. That’s it. I’ve been superglued to the rather lacking documentation to get this far. Even though I doubt it can help, I’ve decided to try logging. I thought it would be as simple as calling libvlc_log_set_file
but it needs a libVLC file pointer, and I don’t know how to create one with a name and mode as in Python.
tl;dr:
1) How do I successfully change the audio output device? 2) How do I set up maximum verbosity logging?
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Answer
1) For some reason, I had to pause and unpause before VLC would register my change.
This code fixes things:
[... rest of GUI class ...] self.p.play() self.root.after(350, self.DeviceSet) def DeviceSet(self): self.p.audio_output_device_set(None, self.audiodevice) self.p.pause() self.root.after(10) self.p.pause()
2) Initialise VLC as follows:
self.instance = vlc.Instance('--verbose 9')