Not sure if this is the right place to post. I know there's already an o2jam converter many years ago, but it doesn't process files in batch (at least I didn't know how to make it work). There were also some other things I couldn't get to work.
Some additional fixes this tool has
EDIT: updated the tool to remove outside dependencies
You can download it from here
https://github.com/djask/o2jam_utils/releases
Source and usage information is here
https://github.com/djask/o2jam_utils
Some additional fixes this tool has
- Most non-keysounded maps don't use virtual mode anymore, so there is audio preview on the song selection like most other maps
- Somewhat better timings on maps with many bpm changes
EDIT: updated the tool to remove outside dependencies
You can download it from here
https://github.com/djask/o2jam_utils/releases
Source and usage information is here
https://github.com/djask/o2jam_utils