On Thu, 29 Nov 2012, Gordon P. Hemsley wrote: > > The apparent contradiction occurs when, e.g., an Opus file is tagged as > "application/octet-stream". > > If I understand correctly, a UA would return "" when canPlayType() is > called against such a file—but then the file would actually play > because it is later sniffed as "application/ogg".
canPlayType() isn't called against files, it's called against MIME type strings. The type "application/octet-stream" isn't a video or audio file type, so we know that the browsers can't play files actually of that type, any more than the browsers can't play videos of type text/css. But when a file is labeled with that type, we know it's probably mislabeled, so we try to do something more useful. On another note, the spec's current behavior with media elements and sniffing is actually very much up in the air, since the last time I worked on this I could not get browser vendors to agree on what to implement. Search for the note starting "This specification does not currently say whether or how to check the MIME types of the media resources". -- Ian Hickson U+1047E )\._.,--....,'``. fL http://ln.hixie.ch/ U+263A /, _.. \ _\ ;`._ ,. Things that are impossible just take longer. `._.-(,_..'--(,_..'`-.;.'
