I tried IPFS Gateway.
Cloudflare’s IPFS Gateway and IPFS official gateway is something difference.
I noticed difference is HTTP header’s content-length property.
It become a problem with video files.
If don’t response content-length, web browser can’t stream (range HTTP header streaming) video and one of browser is can’t play.
For example, check this links.
https://ipfs.io/ipfs/QmQB6JE5BdZiXYYTGiAo3PP4jyUqPHZQtHhyT3vAJdE5Rp
https://Cloudflare-ipfs.com/ipfs/QmQB6JE5BdZiXYYTGiAo3PP4jyUqPHZQtHhyT3vAJdE5Rp