3,041 questions
Audio content type/m4a changed to audio/x-m4a
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(316.8, 62%, 40%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EAR%3C/text%3E%3C/svg%3E)
Anderson Rodrigues Cavalcante
316
Reputation points
Hello,
My app has some allowed extensions and one of them is m4a. To check, I'm taking the ContentType from the file and finding it in an array.
For example:
string[ ] Mimetypes = {
"audio/m4a",
"audio/ogg",
"audio/wav",
"audio/mpeg",
"audio/mp3"
};
string mimeType = file.ContentType;
if (!Mimetypes.Contains(mimeType)){
//not allowed
}
This worked 15 days ago, but now the content type of the same m4a file has changed to "audio / x-m4a".
Any idea why this has changed?
Developer technologies | Universal Windows Platform (UWP)
Developer technologies | C#
11,583 questions
{count} votes
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(128, 8%, 22%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EA%3C/text%3E%3C/svg%3E)
Anonymous2021-12-23T01:25:29.873+00:00 @Anderson Rodrigues Cavalcante Could you please tell me what kind of app that you are developing? Is it a win32 application or a WPF app or a UWP app?
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Anderson Rodrigues Cavalcante 316 Reputation points
2021-12-23T12:05:56.453+00:00 Hello. UWP app.
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Anonymous
2021-12-24T01:23:07.91+00:00 OK, I got it. Could you please share more details about what feature you are trying to achieve and what you have already implemented? It would be better if you could share more code about what you are trying to do. You could update your post for this.
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Anderson Rodrigues Cavalcante 316 Reputation points
2021-12-27T12:11:39.56+00:00 The code is that:
string[ ] Mimetypes = {
"audio/m4a",
"audio/ogg",
"audio/wav",
"audio/mpeg",
"audio/mp3"
};
string mimeType = file.ContentType;
if (!Mimetypes.Contains(mimeType)){
//not allowed
}I have a StorageFile and its ContentType. I don't know why, but the ContentType of m4a is now is x-ma4.
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Anonymous
2021-12-28T07:41:33.24+00:00 Did you change the StorageFile locally?
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Anonymous
2021-12-29T07:29:14.21+00:00 Could you please tell me where did you get the storage file?
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Anderson Rodrigues Cavalcante 316 Reputation points
2021-12-29T12:02:19.053+00:00 The StorageFile come from the File which I attach.
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Anonymous
2021-12-30T02:57:29.387+00:00 Is it the same file and have you ever made any changes to the file or the code? Would you mind sharing more code about how you get the file?
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