[youtube] -FZ-pPFAjYY: Downloading webpage
[info] Writing video description metadata as JSON to: vfs://yt-dl/THE BATMAN Trailer (2021)--FZ-pPFAjYY.info.json
WARNING: Requested formats are incompatible for merge and will be merged into mkv.
[download] Destination: vfs://yt-dl/THE BATMAN Trailer (2021)--FZ-pPFAjYY.f399.mp4

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[download] Destination: vfs://yt-dl/THE BATMAN Trailer (2021)--FZ-pPFAjYY.f251.webm

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[ffmpeg] Merging formats into "vfs://yt-dl/THE BATMAN Trailer (2021)--FZ-pPFAjYY.mkv"
Deleting original file vfs://yt-dl/THE BATMAN Trailer (2021)--FZ-pPFAjYY.f399.mp4 (pass -k to keep)
Deleting original file vfs://yt-dl/THE BATMAN Trailer (2021)--FZ-pPFAjYY.f251.webm (pass -k to keep)