Compute and add X-Content-Duration header for .ogg files to nginx

Question

I am using nginx to serve .mp3 and .ogg files. The article Configuring servers for Ogg media suggests to add the X-Content-Duration header when serving .ogg files to avoid that the browser has to seek in order to determine the audio length.

Oggz is able to compute the length of an .ogg audio file.

How can I configure nginx to automatically invoke Oggz to compute the length of the audio, cache it, and add it to the headers when serving the file?

Answer 1

I would use Lua and would try to avoid a shell call by using lua itself to parse the ogg headers.