@injinlin Oh my god sigh I seriously don’t understand, I also tried just stopping the sound like a madman and it would still work afterwards. It would seem almost as if stopping the sound simply cut the audio stream inside the software.
Is it possible for you to try the following: Play it once, stop, let it play again without sound, then delete the sound and import the same sound again on the same layer.
If the sound comes back, let us know. If it doesn’t play then create a new sound layer and import the same sound over it and play it again. Let us know if it works or not.
Lastly, does this happen with ANY other sound? like doesn’t have to be a soundtrack. If it does or does not let us know as well.
For now these test will not fix the issue, but if we can at least ascertain that there is a trouble in the way that the audio streamer is working or something maybe one of the smarter devs can help review this problem quicker.
Also, I don’t want to say this, but this is looking like a really specific and troublesome bug. I work in animation so I know how important it is to solve these things quickly, and I’m really sorry so far we haven’t found even a probable cause, so my only real advice from here on would be to use a video editor and arrange the exported images there and adjust the timing from your animation relative to the soundtrack, since video editors have audio scrubbing. Only use Pencil2D to have a general sense of where the images are in relation to the soundtrack.
There are two applications I have used and know that you can get audio scrubbing. One is Opentoonz and the other one is Blender. Blender has a video editor incorporated where you dump the audio tracks and get them to work effortlessly when using the “grease pencil” object and tools. I have a 2-part webinar on grease pencil if you want to see that (I’ll only link them if you want to try that though), but it’s really easy to draw there. As for Opentoonz, it was working last time I used it but I’m not sure right now, however it’s worth a shot just so you can finish your work.
There are free “pure” video editors that you can try as well like: