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https://issues.apache.org/jira/browse/TIKA-851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13194891#comment-13194891
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Nick Burch commented on TIKA-851:
---------------------------------

I've added the audio/x-m4a alias in r1236734.
                
> M4V and M4A detection invalid
> -----------------------------
>
>                 Key: TIKA-851
>                 URL: https://issues.apache.org/jira/browse/TIKA-851
>             Project: Tika
>          Issue Type: Bug
>          Components: mime
>    Affects Versions: 1.0
>            Reporter: Alexander Chow
>             Fix For: 1.1
>
>         Attachments: TIKA-851.patch
>
>
> When the mime type of an M4V file is detected using its name only, it returns 
> video/x-m4v.  When it is detected using the InputStream (hence utilising the 
> MagicDetector), it incorrectly returns video/quicktime.
> Using the sample M4V file from Apple's [knowledge 
> base|http://support.apple.com/kb/HT1425]:
> {code:title=TikaTest.java}
> public class TikaTest {
>       public static void main(String[] args) throws Exception {
>               String userHome = System.getProperty("user.home");
>               File file = new File(userHome + "/Desktop/sample_iPod.m4v");
>               InputStream is = TikaInputStream.get(file);
>               Detector detector = new DefaultDetector(
>                       MimeTypes.getDefaultMimeTypes());
>               Metadata metadata = new Metadata();
>               metadata.set(Metadata.RESOURCE_NAME_KEY, file.getName());
>               System.out.println("File + filename: " + detector.detect(is, 
> metadata));
>               System.out.println("File only:       " + detector.detect(is, 
> new Metadata()));
>               System.out.println("Filename only:   " + detector.detect(null, 
> metadata));
>       }
> }
> {code}
> Renders the output:
> {code}
> File + filename: video/quicktime
> File only:       video/quicktime
> Filename only:   video/x-m4v
> {code}
> Moreover, if the same test is run against an M4A file, the results are even 
> more incorrect:
> {code}
> File + filename: video/quicktime
> File only:       video/quicktime
> Filename only:   application/octet-stream
> {code}

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