Unable to hear audio in a mp4 file

[Zavecen]

I created an mp4 file with audio but when I start recording I only hear about 1 millisecond of sound and then silence.
The video is still playing but no audio can be heard from that initial blip.

[James231]

Thanks for raising the issue.

The only workaround I currenly know of is to split the audio from the video, and play it using a separate Audio track.

Cause of the issue:
Out of the box Unity's VideoPlayer is not compatible with Unity Recorder (the video plays at incorrect speeds). As a fix I made a modification to use VideoPlayer.SetForward each frame rather than VideoPlayer.Play here. While this fixes the video playback speed, it breaks the audio.

[Zavecen]

Ok, that sounds good. Does seem in keeping with Unity's struggles with Video playback. I'll keep with the workaround for now.