I am getting the Amazon Captcha problem as well. Running version 2.79.0.
A day ago I fetched metadata for a whole bunch of books (maybe 300 or so), but after that none of the books I fetched would return metadata. I didn't fetch anything for ~16 hours and it still doesn't work.
I changed the setting in the preferences of which Amazon website to use (tried various other countries); and it still shows up in the log that is provided as Amazon.com not working.
The same book fetched at Amazon.com in my web browser works fine.
This is really quite annoying because I had never gotten this error before, and now it looks like I can't fetch any metadata anymore. I tried the other sources in the metadata preferences but none of them actually work for the books I am searching for (these are not obscure books).
Quote:
****************************** Amazon.com ******************************
Request extra headers: [('User-agent', u'Mozilla/5.0 (Windows NT 6.1; Trident/7.0; rv:11.0) like Gecko')]
Found 0 results
Downloading from Amazon.com took 1.10199999809
Plugin Amazon.com failed
Traceback (most recent call last):
File "site-packages\calibre\ebooks\metadata\sources\identify. py", line 48, in run
File "site-packages\calibre\ebooks\metadata\sources\amazon.py ", line 1163, in identify
File "site-packages\calibre\ebooks\metadata\sources\amazon.py ", line 1073, in parse_results_page
CaptchaError: Amazon returned a CAPTCHA page, probably because you downloaded too many books. Wait for some time and try again.
************************************************** ******************************
****************************** Google ******************************
Request extra headers: [('User-agent', u'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36')]
Found 0 results
Downloading from Google took 1.4279999733
************************************************** ******************************
The identify phase took 1.63 seconds
The longest time (1.428000) was taken by: Google
Merging results from different sources and finding earliest publication dates from the worldcat.org service
We have 0 merged results, merging took: 0.00 seconds
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