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Written to support internet mail exchange, the MIME system has outgrown it's original scope in the modern world and is now used to describe files and media used on the web and in web applications. The base mime types are Image, Audio, Video, Application, Multipart, and Message. I will ignore the last two since they are very email specific and haven't really escaped their original scope.

'Image' and 'Audio' are straight forward just still image file formats and audio encoding formats. 'Video' is for 'time-varying-picture image, possibly with color and coordinated sound.' Which should basically cover all of our container formats such as ogg, asf, mpeg, and quicktime. Next we come to 'Application'. This MIME type told us that a helper application was needed to view the data it stored, and was only to be used when one of the other MIME types didn't fit the bill to describe the data.

In the 'Video' section of RFC 2046 states 'Unrecognized subtypes of "video" should at a minumum be treated as "application/octet-stream"'.

My major complaints about mime types and mime handling mostly derive from implementers confusion about this. The 'file' binary on ubuntu returns application/octet-stream as the mime type for unknown video types such as ASF instead of something like video/x-unknown. The people behind OGG as well have done something equally silly choosing 'application/ogg' as the mime type for ogg encoded files. Since ogg contains sync's audio and moving image it seems like a shoe in for 'video/ogg'.

For my purposes as a developer working outside of the original scope, I really only need to know the MIME media type not the subtype. I'm concerned with implementing abstract work flows for different media types. The processes and metadata associated with video, image, or audio MIME types tend to be the same across all sub types. Available tools like ffmpeg and imagemagick tend to abstract the subtype handling and even the type handling at times. Most players and browsers abstract the subtype presentation.

Why after 10+ years have the people working with media files and mime detections tools not decided to adhere to the RFC and make it easy for me to detect or know the MIME Media type of a file consistently. I can only imagine the hoops the developers who deal with the subtypes have to jump through.

In Drupal I hope to work around this and bring some sanity to myself. It will begin with the first hook_filefield module I've been wanting to write since I implemented hook_filefield.... I still think this should happen in core via hook_file....

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