I applied the Reverb filter to a few audio clips and video clips with audio without any problem. The reverberation level was the same before and after exporting.
Does it happen to you with every clip? Or just one particular clip?
I don’t reproduce this, either. If you are interested to help debug, a next step would be if you could make a minimum example project that uses a single media file to demonstrate the problem. Provide the project file and media file to me and I can try to debug it.
Thanks for sharing the files. I opened your project and looked at your reverb parameters. I found that the Early Reflection Level was cranked up to the maximum level:
I went back into the file, to see the effect changing this parameter… To my surprise, the file sounded, awful…
The thing being: whenever this situation reared it’s head in the past, the shoutcut file (with whatever preset reverb I had adopted) sounded fine, but the exported file was horrible…
So, it seems that the chosen reverb is not being accurately represented in my working shotcut files, until I exit all windows and reboot…?
That would explain it. But i do not know how that could happen. If you notice it happen again, please save a copy of the Shotcut application log and share it. Hopefully there would be a hint in there.