First, the call to the YouTube Data API v2 is already outdated and encourages the use of the YouTube Data API (v3).
I found in this thread that https://www.youtube.com/feeds/videos.xml?playlist_id=xxxxx limited to only 15 videos or results.
The old API uses max-results and start-index to get more results, but it doesn't work anymore when I try.
If you want more results than 15, I suggest you use the PlaylistItems: list YouTube Data API (v3). It has a maxResults parameter, which you can set no more than 50. To get another or the next 50 results, you can use the pageToken parameter for it.
We hope this information helps you.
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