I have since yesterday the XML stream Youtube videos is down, do you have the same problem? thank you
Example : please click
According to this blogpost, v2 is not available anymore. It looks like you are using v2 because of the gdata.youtube.com in your links.
Here are the 2 new Youtube RSS feed structure that you will need for Youtube video syndication and to pull videos into RSS readers.
Channel ID - https://www.youtube.com/feeds/videos.xml?channel_id=YOURCHANNELID Replace YOURCHANNELID with your Youtube channels ID number.
Username - https://www.youtube.com/feeds/videos.xml?user=USERNAME Replace USERNAME with your Youtube username.