I have rendered it in WMV and AVI and I still get the same error message. Sometimes Youtube says the file is over 15 minutes but the song is under 3 minutes.
The work is political in nature and Youtube has earned a reputation for unfair anonymous censorship, shadow banning and mob rule. I call it butt hurt syndrome.
I can find nothing to lead me to believe that it is a Mixcraft issue because an AVI file is an AVI file and a WMV file is a WMV file. Given the fact that every other song/video I have rendered with Mixcraft uploaded with no problem.
It is interesting to note that without warning or explanation Soundcloud froze and then when I asked for an explanation they removed my channel and again with no warning or explanation.
My only thought is, perhaps one of the new still images is why YT is saying, "The file you are uploading may not be a valid video file."
I have had moral and ethical issues with Google and Youtube for quite sometime and I have not been shy about expressing them. As a songwriter who listened to a lot of protest songs e.g. Fogerty, Lennon, Country Joe, Johnny Cash, Dylan. Phil Ochs, Leonard Cohen etc... etc... I feel a social responsibility to write purposeful songs like the broadside ballads during the 1700's.
I once got kicked out of a bar in the South for singing The Battle Hymn of The Republic.
I hope I am wrong and that it is merely one of the still images causing the issue. At this point I will be deleting images from the video track to see if that resolves the problem. I wasted my time on the YT help forum.
Even if I am wrong that it is a censorship thing, the fact remains, Google and YT are not the best corporate citizens as demonstrate by the many multi-billion dollar fine by the EU for unethical and criminal business practices and their censoring content at the behest of the tyrannical Chinese government.
I use Bing and Duck Duck Go. They work great.
To what upload option are you referring?
I came up with a work around. 