images.get_serving_url(blob_key) returns error when ran from appengine in cloud.

Question

images.get_serving_url() returns the below error when ran from appengine in cloud but work fine when run in local environment. It works for fine image files saved in blob store, the issue is only with vido files. I am stuck with this and I dont know how to debug this. Any help is greatly appreciated.

File "/base/data/home/apps/s~silicon-window-102123/1.387642514189268755/main.py", line 95, in post url=images.get_serving_url(localkey) File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/api/images/init.py", line 1794, in get_serving_url return rpc.get_result() File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/api/apiproxy_stub_map.py", line 613, in get_result return self.get_result_hook(self) File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/api/images/__init.py", line 1892, in get_serving_url_hook raise _ToImagesError(e, readable_blob_key) TransformationError

Answer 1

The clue is in the error thrown: TransformationError

It does not work for video files. In the documentation for get_serving_url

google.appengine.api.images.get_serving_url(blob_key, size=None, crop=False, secure_url=None, filename=None, rpc=None)[source]

the method is described as 'Obtain a url that will serve the underlying image'.

And some of the options don't make all that much sense for video. The word video does not appear on that page. It's not supported.