How to Fix Audio and 'Preparing Video' Issues When Playing Videos in Unity?

Troubleshooting Unity Video Playback: Audio and Preparation Issues

Unity's shift from MovieTexture to the VideoPlayer and VideoClip API (since version 5.6.0b1) brought enhanced cross-platform video support, but also introduced some common pitfalls. This guide addresses two frequent problems: audio playback failures (especially on Windows 10 Editor) and the "Preparing Video" hang.

Fixing Audio Playback Issues

To ensure audio plays correctly, implement these crucial lines before calling videoPlayer.Prepare();:

// Route audio output to an AudioSource
videoPlayer.audioOutputMode = VideoAudioOutputMode.AudioSource;

// Enable and assign the audio track to the AudioSource
videoPlayer.EnableAudioTrack(0, true);
videoPlayer.SetTargetAudioSource(0, audioSource);

This directs the video's audio to your designated AudioSource for playback.

Resolving the "Preparing Video" Hang

The "Preparing Video" infinite loop is often resolved in one of two ways:

1. Timeout Mechanism: Introduce a timeout to prevent indefinite waiting. Use a WaitForSeconds coroutine:

WaitForSeconds waitTime = new WaitForSeconds(5);
while (!videoPlayer.isPrepared)
{
    Debug.Log("Preparing Video");
    yield return waitTime;
    break; // Exit loop after timeout
}

2. playOnAwake Setting: Alternatively, enable playOnAwake for both videoPlayer and audioSource:

videoPlayer.playOnAwake = true;
audioSource.playOnAwake = true;

This initiates playback automatically when the scene loads.

Additional Considerations

• Video Sources: Use videoPlayer.source = VideoSource.Url for web-based videos, remembering platform-specific path prefixes when loading from StreamingAssets.
• Supported Formats: Consult Unity's documentation for platform-specific compatible video formats.

Conclusion

By applying these solutions, Unity developers can seamlessly integrate video playback with reliable audio output, avoiding common hurdles associated with the VideoPlayer API.

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