Desync of Song Playback and Midi/Lyrics in Editor when using variable bit rate (VBR)
Shildifreak opened this issue · comments
Issue type: Bug report
Actual behaviour
I tried hours to position the notes in a song correctly, messing with BPM etc., but they were always slightly out of sync.
I noticed that the desync was sometimes early and other times late even if I did not change anything with the notes: just playing the part I was working on vs playing the whole song.
Eventually I found a forum post mentioning checking Karaoke Songs for variable bit rate (VBR) and converting them to constant bit rate (CBR).
After using ffmpeg to do just that the problem was immediately gone.
Expected behaviour
Ideally the synchronisation should just work.
Alternatively there should be some indication/warning message that VBR vs CBR is a thing and songs should use CBR encoding.
If I understand correctly, this is only a problem in the editor, not in normal gameplay because there the songs are always played from the beginning.
Steps to reproduce
- Open the StandaloneLinux64
- Create new Song, insert mp3 with variable bit rate, place some notes
- play the song starting at different timestamps
- notice how the notes are sometimes early and other times late
Details
- UltraStar Play version: 0.9.0 (also 0.7.0, but I updated to see if maybe it was already fixed and some other bugs are :) but this it isn't)
- Operating System: Ubuntu 22.04.3 LTS
This may be related to the Unity bug mentioned in issue #362
