Batch Delete Videos From YouTube Favorites Playlist - youtube

Question

I am trying to batch delete videos from the user his YouTube favorites using the YouTube v2 API. (See also https://developers.google.com/youtube/2.0/developers_guide_protocol_batch_processing)
Posting videos to the favorites in batch works nicely; and I can also remove single videos from the favorites without problem (This rules out a problem with authentication).
My request body is as follows, where VIDEOID1 and VIDEOID2 are the <yt:favoriteId>Ids found in their corresponding video xml:
<?xml version="1.0" encoding="UTF-8"?>
<feed xmlns='http://www.w3.org/2005/Atom' xmlns:media='http://search.yahoo.com/mrss/' xmlns:batch='http://schemas.google.com/gdata/batch' xmlns:yt='http://gdata.youtube.com/schemas/2007'>
<batch:operation type="delete"/>
<entry><id>VIDEOID1</id></entry>
<entry><id>VIDEOID2</id></entry>
</feed>
This is the response I get back however, where UserID ofcourse is the userID of the user and BatchID is the BatchID given by the service:
<?xml version='1.0' encoding='UTF-8'?>
<feed xmlns='http://www.w3.org/2005/Atom'>
<id>https://gdata.youtube.com/feeds/api/users/USERID/favorites/batch/BATCHID</id>
<updated>2014-01-31T14:50:54.948Z</updated>
<category scheme='http://schemas.google.com/g/2005#kind' term='http://gdata.youtube.com/schemas/2007#favorite'/>
<title>Batch Feed</title>
<entry xmlns:batch='http://schemas.google.com/gdata/batch'>
<id>VIDEOID1</id>
<updated>2014-01-31T14:50:54.948Z</updated>
<title>Error</title>
<content>Invalid entry Id/Uri</content>
<batch:status code='400' reason='Invalid entry Id/Uri'/>
</entry>
<entry xmlns:batch='http://schemas.google.com/gdata/batch'>
<id>VIDEOID2</id>
<updated>2014-01-31T14:50:54.949Z</updated>
<title>Error</title>
<content>Invalid entry Id/Uri</content>
<batch:status code='400' reason='Invalid entry Id/Uri'/>
</entry>
</feed>
It states Invalid entry Id/Uri for the videos I try to remove, while when I remove them by singular delete request with the same ID, it works.
Is batch deleting videos from favorites not supported, or am I missing something?

Answer 1

I've got it to work, thanks to this question and answer: Batch deleting videos using YouTube API and HTTpWebRequest
The trick was using the user its userId instead of default, and to use to complete video URL as id.
The batch URL looks like this:
https://gdata.youtube.com/feeds/api/users/USERID/favorites/batch?v=2&alt=json
The request looks like this:
<?xml version="1.0" encoding="UTF-8"?>
<feed xmlns='http://www.w3.org/2005/Atom' xmlns:media='http://search.yahoo.com/mrss/' xmlns:batch='http://schemas.google.com/gdata/batch' xmlns:yt='http://gdata.youtube.com/schemas/2007'>
<batch:operation type="delete"/>
<entry>
<id>https://gdata.youtube.com/feeds/api/users/USERID/favorites/VIDEOID1?v=2</id>
</entry>
<entry>
<id>https://gdata.youtube.com/feeds/api/users/USERID/favorites/VIDEOID2?v=2</id>
</entry>
</feed>