ThumbnailUtils.createVideoThumbnail() can not get bitmap

I test many file formats for this, e.g. avi、flv、wmv…, but all of this get null bitmap:

String aviPath = "xxxx.avi";
Bitmap bitmap = ThumbnailUtils.createVideoThumbnail(aviPath, MediaStore.Images.Thumbnails.MINI_KIND);

and had log like this:
java.io.IOException: Failed to create thumbnail, can’t open xxx.avi。

Is it means that these file formats can’t be supported now? or using it wrong?

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