I'm getting nowhere. I decided to try some alternatives, without success. First I installed a couple of programs that claim to be able to download from youku, but they didn't work; I think maybe they only work with youku.com (which wants money), not for youku.tv. Then I started my free trial of the competitor, but it doesn't seem to accept links. My guess is that something about the downloaded file causes the processing/remuxing to choke, which would be a developer issue, and not likely to be addressed soon. Sorry I can't help, I decided to answer anyway to not leave you with dead air. Maybe one of the more experienced people can find something in your log file, but probably not since if an error were detected and logged then you'd probably get an error message instead of a bad file. I didn't try other Youku files, did you?