[youtube] sy_yQHN2K6g: Downloading webpage
[info] Writing video description metadata as JSON to: vfs://yt-dl/Doc Ock Sings!-sy_yQHN2K6g.info.json
[download] vfs://yt-dl/Doc Ock Sings!-sy_yQHN2K6g.mkv has already been downloaded and merged
WARNING: Requested formats are incompatible for merge and will be merged into mkv.