Video VideoPlayer 2017.3 does not play audio

Hi,

I have VideoPlayer configured to play mp4-video from local file URL. The audio output is AudioSource. This worked already on Unity 5.6 & 2017.1. After the upgrade to Unity 2017.3 (I tried b4 & b3 beta-versions, as well as 2017.2.0f3), the video plays OK, but the audio is not playing at all. After reading the VideoPlayer script reference, I added this line after Prepare():
"
videoPlayer.controlledAudioTrackCount = videoPlayer.audioTrackCount;
"
But the audio is still not playing. If I set the same video to play from VideoClip instead of URL, the audio is playing. What am I missing?

 

I think I found a workaround:
"
videoPlayer.controlledAudioTrackCount = 1;
"

 

I had to set the "source" first. Then, setting the controlledAudioTrackCount = 1 worked for me.

Code (CSharp):

1. VideoPlayer lPlayer = gameObject.GetComponent<VideoPlayer>();
2. lPlayer.source = UnityEngine.Video.VideoSource.Url;
3. lPlayer.audioOutputMode = UnityEngine.Video.VideoAudioOutputMode.AudioSource;
4. lPlayer.controlledAudioTrackCount = 1;
5. lPlayer.EnableAudioTrack(0, true);
6. lPlayer.SetTargetAudioSource(0, lAudioSource);

Do this before loading and playing.

 

The issue was that before 2017.3.0 the controlledAudioTrackCount-property was set to 1 internally. Now it's 0, and the developer should set it explicitly, if the source is URL. If the source is VideoClip, it's set automatically from the clip's meta-data.