[jira] [Commented] (TIKA-1177) Add Matroska (mkv, mka) format detection

["Nick Burch (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TIKA-1177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13787254#comment-13787254 ] 

Nick Burch commented on TIKA-1177:
----------------------------------

Matroska is a container format, so as with things like OLE2 / Ogg / Zip, we can't do fully accurate detection with just magic types.

I've add a common parent type in r1529477, which has allowed for more of the tests to work. For full detection, we need a custom detector, see TIKA-1180

> Add Matroska (mkv, mka) format detection
> ----------------------------------------
>
>                 Key: TIKA-1177
>                 URL: https://issues.apache.org/jira/browse/TIKA-1177
>             Project: Tika
>          Issue Type: Improvement
>          Components: mime
>    Affects Versions: 1.4
>            Reporter: Boris Naguet
>            Assignee: Ray Gauss II
>            Priority: Minor
>             Fix For: 1.5
>
>
> There's no mimetype detection for Matroska format, although it's a popular video format.
> Here is some code I added in my custom mimetypes to detect them:
> {code}
> 	<mime-type type="video/x-matroska">
> 		<glob pattern="*.mkv" />
> 		<magic priority="40">
> 			<match value="0x1A45DFA3934282886d6174726f736b61" type="string" offset="0" />
> 		</magic>
> 	</mime-type>
> 	<mime-type type="audio/x-matroska">
> 		<glob pattern="*.mka" />
> 	</mime-type>
> {code}
> I found the signature for the mkv on: 
> http://www.garykessler.net/library/file_sigs.html
> I was not able to find it clearly for mka, but detection by filename is still useful.
> Although, the full spec is available here:
> http://matroska.org/technical/specs/index.html
> Maybe it's a bit more complex than this constant magic, but it works on my tests files.



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