I’d be curious to know if you see any difference with the transcoder forum preview version of PMS:
Part of the preview is an upgrade to the version of FFMPEG on which the Plex transcoder is based (to 6.1).
Whatever the case, you’ll likely need to provide complete server logs (debug enabled, but not verbose) to receive any real help. Snippets are rarely sufficient to aid in diagnosis as they simply don’t provide enough context.