Transcoding fails on Roku with subtitles for some media

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I know others have asked questions, but you'll likely need to post your ffmpeg log (easiest retrieval is via Dashboard > Logs) of when this happens. Recreate the issue, then immediately find the most recent ffmpeg log in the list, open or download it, upload it to pastebin or somewhere similar, and post it. You can obfuscate any details you're worried about, but careful not to pull out any data that's needed for troubleshooting.