Getting "Error: unknown data supplied, operation cancelled" when uploading MP3s

I am using 1.3.7 with no addons and i use Media Temple.

I have searched in the forum for my error, but there wasn't really any solutions to it.

I am trying to upload MP3 files that are about 15MB-20MB in size. I have set the maximum file upload size to 26480000 and have set my php's upload_max_filesize to 25M. I was able to upload MP3s up to 6.4MB in size. When trying something around 8MB or above, it gave me the "unknown data supplied" error.

Anyone encountered this problem before and have successfully resolved it?

Thanks so much for your time and assistance.

Have you set the PHP max_post_size as well?
Have you restarted apache after making your PHP configuration changes?

DrByte:

Have you set the PHP max_post_size as well?
Have you restarted apache after making your PHP configuration changes?

oh thanks so much! that was it. i also need to set the post_max_size. i found another thread on this subject and the only thing mentioned was to change the upload_max_filesize value.