Youku.com has a size limit for uploading videos, and longer videos are just bigger in comparison.
Youku upload video file limitations:
Uploaded through the web, the size of a single video file can not exceed 2G, VIP members can be up to 4G.
Uploaded through the Youku PC client software, the maximum support for a single video file 10G, the maximum of VIP members can be up to 15G.
Extended information
Information
This is the first time that a video file has been uploaded to the website.2. You may not upload videos with pornographic content.
3. You may not upload any video with vulgar content or in poor taste.
4. No videos with pornographic and seductive content may be uploaded.
5. No words with vulgar and pornographic meanings may appear in the title, introduction and tags.
6. If you upload video content through Youku.com, Tudou.com or Laixian.com, you need to authenticate your real name, including providing ID information and real photos.
Youku official website - Youku member ? Help Center
Youku.com-Upload Terms of Service