The script automatically adds videos from all your YouTube subscriptions into your watch later list.
Didn't find any signs of such functionality available natively... which is weird. Am I missing something?
Anyways, I've taken time and wrote a simple google script to do that for me. For anyone interested feel free to use, copy and modify any way you like:
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Raw Sources (you will have to copy-paste sources into your google drive script editor)
In order for this to work you need to:
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Copy the script to your local google drive (so that when I do further changes it will not affect your version).
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Have all your YT subscriptions send emails to your gmail about new videos and label them with the "YouTube WL" label (keep the uppercase letters and remove the quotes).
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Enable advanced services in google - YouTube Data API v3.
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Select "AddNewVideosToWatchLater" on the left side of the screen.
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Run "AddAddNewVideosToWatchLaterTrigger" function once (it will add trigger for you).
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Press "save".
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You may also want to add "notifications" to get errors to your email if any.
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That should be it.
If there are any problems or unexpected behavior do the following:
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Open the script.
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Select "AddNewVideosToWatchLater" on the left side of the screen.
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Select and run "AddNewVideosToWatchLater" function once.
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Press ctrl+enter or visit view->logs menu and look for errors.
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What script essentially does is parses all unread messages with "YouTube WL" label, gets video url form them and then marks them read.
If there are any questions/proposals/improvements/bugs - feel free to leave a comment.
The script is free to use/modify/extend.
If you still like to express your gratitude - there is http://donate.diraven.com/ . =)
Thanks and good luck. =)