Thanks to everyone who took time to contribute here! Let me try to sum up, from my understanding. For metadata information about an image, using the imageinfo/extmetadata API is sensible for the moment. We're aware and followed the talks on the structured data project during Wikimania, and we're quite keen to see the results of that when and if it starts being useful.
For thumbnails, there's no way to know if a thumbnail size has already been rendered or not, but given that the MediaViewer has a default list of widths that correspond to popular screen size resolutions[1], it's a fair bet that for instance 640x and 800x would work, except for situations when the image file is smaller than the requested thumbnail size. It's possible to use Special:Redirect or thumb.php to get the thumbnail/URL, but both are actually PHP scripts that need running. So while perhaps not ideal, it seems to make the most sense here to generate the thumbnail URLs ourselves and hit the web server directly. Sincerely, Jonas [1] https://git.wikimedia.org/blob/mediawiki%2Fextensions%2FMultimediaViewer/e7ea5cb25d285bc7685838a6f375bcf0d9b4b6ff/resources%2Fmmv%2Fmmv.ThumbnailWidthCalculator.js On 4 September 2014 21:47, Derk-Jan Hartman <[email protected]> wrote: > Correct, better not rely on thumb.php, the servers will just generate > the thumb if it is not yet present on the canonical address yet, that > Special:Redirect can point you at. > > Also, almost all this info can be retrieved in one go from the api.php > of course: > > http://commons.wikimedia.org/w/api.php?action=query&titles=File:30C3_Commons_Machinery_2.jpg&prop=imageinfo&iilimit=50&iiprop=sha1|url|thumbmime|extmetadata|archivename&iiurlwidth=640&iilimit=1 > > Lists almost all the info of the latest revision of the file. > > DJ > > On Thu, Sep 4, 2014 at 3:04 PM, Daniel Schwen <[email protected]> wrote: >> I was told thumb.php is evil (for lack of caching). >> I'm using special:redirect with the width=640 parameter. >> Daniel >> >> On Sep 4, 2014 5:49 AM, "Jean-Frédéric" <[email protected]> wrote: >>> >>> >>>>> > The first three we can get from pretty much either API, or extract >>>>> > directly from >>>>> > a dump file. The latter is eluding us though, for two reasons. One is >>>>> > that a >>>>> > file, like 30C3_Commons_Machinery_2.jpg, is actually in the /b/ba/ >>>>> > directory - >>>>> > but where this /b/ba/ comes from (a hash?) is unclear to us now, and >>>>> > it's not >>>>> > something we find in the dumps - though we can get it from one of the >>>>> > APIs. >>>> >>>> >>>> Yes, /b/ba ist based on the first two digits of the MD5 hash of the >>>> title: >>>> >>>> md5( "30C3_Commons_Machinery_2.jpg" ) -> ba253c78d894a80788940a3ca765debb >>>> >>>> But this is "arcane knowledge" which nobody should really rely on. The >>>> canonical >>>> way would be to use >>>> >>>> https://commons.wikimedia.org/wiki/Special:Redirect/file/30C3_Commons_Machinery_2.jpg >>>> >>>> Which generates a redirect to >>>> >>>> https://upload.wikimedia.org/wikipedia/commons/b/ba/30C3_Commons_Machinery_2.jpg >>>> >>>> To get a thumbnail, you can directly manipulate that URL, by inserting >>>> "thumb/" >>>> and the desired size in the correct location (maybe Special:Redirect can >>>> do that >>>> for you, but I do not know how): >>>> >>>> >>>> https://upload.wikimedia.org/wikipedia/commons/thumb/b/ba/30C3_Commons_Machinery_2.jpg/640px-30C3_Commons_Machinery_2.jpg >>> >>> >>> If I am not mistaken you can use thumb.php to get the needed thumb? >>> <https://commons.wikimedia.org/w/thumb.php?f=Example.jpg&width=100> >>> >>> (That’s what I used in my CommonsDownloader [1]) >>> >>> [1] >>> <https://github.com/Commonists/CommonsDownloader/blob/master/commonsdownloader/thumbnaildownload.py> >>> >>> Hope that helps, >>> -- >>> Jean-Frédéric >>> >>> _______________________________________________ >>> Commons-l mailing list >>> [email protected] >>> https://lists.wikimedia.org/mailman/listinfo/commons-l >>> >> >> _______________________________________________ >> Multimedia mailing list >> [email protected] >> https://lists.wikimedia.org/mailman/listinfo/multimedia >> > > _______________________________________________ > Multimedia mailing list > [email protected] > https://lists.wikimedia.org/mailman/listinfo/multimedia _______________________________________________ Multimedia mailing list [email protected] https://lists.wikimedia.org/mailman/listinfo/multimedia
