@melagodo Just to be clear on that... This is not exactly an issue with Unmanic. If you are converting a video in a container such as MP4 which contains bitmap subs to a container like mkv that doesn't support them, then it will fail. If you like, I can write you a plugin that will strip subtitles if they are bitmap type, but if they are txt type, leave them and copy them to the new mkv. Let me know.