Alternative for https://gdata.youtube.com/feeds/api/videos/<video_id>?v=2

If I'm understanding your question correctly then you should be using https://www.googleapis.com/youtube/v3/videos?id=<video_id>&key=<YOUR_API_KEY>&part=snippet from now on.

Google shutdown the old API effective April 20th, 2015.

Take a look at the newest v3 API getting started.

You can use this link with your Youtube channel id after the = and it should work.

https://www.youtube.com/feeds/videos.xml?channel_id= your youtube channel id number