https://bugzilla.wikimedia.org/show_bug.cgi?id=59894

--- Comment #2 from Tilman Bayer <tba...@wikimedia.org> ---
For another data point, compare these two thumbnail URLs (stills of the same
video at 12:27 and 12:28, respectively, with the same size): [1] [2]

[1]  works fine, while [2] generates the same "Error generating thumbnail"
message as above.

This probably has to do with the fact that [1] has already been generated
earlier, as it is in use on a wiki page [3].

On the other hand, a still at the same time as [1] but with a different size
(which probably has not been used/generated before) displays fine, too: [4]


[1]
https://upload.wikimedia.org/wikipedia/commons/thumb/b/bb/WMF_Monthly_Metrics_Meeting_December_5%2C_2013.ogv/550px-seek%3D747-WMF_Monthly_Metrics_Meeting_December_5%2C_2013.ogv.jpg

[2]
https://upload.wikimedia.org/wikipedia/commons/thumb/b/bb/WMF_Monthly_Metrics_Meeting_December_5%2C_2013.ogv/550px-seek%3D748-WMF_Monthly_Metrics_Meeting_December_5%2C_2013.ogv.jpg

[3] https://meta.wikimedia.org/wiki/Wikimedia_Foundation_Report,_November_2013

[4]
https://upload.wikimedia.org/wikipedia/commons/thumb/b/bb/WMF_Monthly_Metrics_Meeting_December_5%2C_2013.ogv/750px-seek%3D747-WMF_Monthly_Metrics_Meeting_December_5%2C_2013.ogv.jpg

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