"Your browser does not currently recognize any of the video formats available."

[Kogaku]

I have been trying to download some classic ("B movie") science fiction movies from the '40s, '50s, and '60s from Youtube. Most seem to work OK, but I am getting quite a few that it refuses to display to the downloader, and thus, the downloader cannot analyze or download them.

I get a black screen in the video box on the Youtube page, with this message in the middle:

Your browser does not currently recognize any of the video formats available.
Click here to visit our frequently asked questions about HTML5 video.

[Mona]

Please list the website URLs you have problem with, and send the latest DVDFab Downloader log files for troubleshooting, the default location for log file is:
C:\Users\computer name\Documents\DVDFabDownloader\log