There seems to be a bug regarding long song titles.
The video will encode fine, but on uploading to YouTube it errors on this:
(The song used in question was https://osu.ppy.sh/s/46594)
The video will encode fine, but on uploading to YouTube it errors on this:
Youtube upload failed with reason: <?xml version='1.0' encoding='UTF-8'?><errors><error><domain>yt:validaLooking that up in the YouTube API reference, it seems the video title was too long. I do believe the maximum title length is 60 characters.
tion</domain><code>too_long</code><location type='xpath'>media:group/media:title/text()</location></error
></errors>
(The song used in question was https://osu.ppy.sh/s/46594)