It’s a known issue with the new Intel driver and burned subtitles. Instead of deleting the driver and/or downgrading all the way to 1.16, you can try one of these versions:
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1.18.4.2082 > Hardware Transcoding broken when burning subtitles ApolloLake-based Synology NASes(Synology only) - 1.18.4.2155 > Hardware Transcoding broken when burning subtitles ApolloLake-based Synology NASes (Synology, QNAP, Linux)
