diff --git a/transcoder/src/identify.rs b/transcoder/src/identify.rs
index 958da9b7..199f0b20 100644
--- a/transcoder/src/identify.rs
+++ b/transcoder/src/identify.rs
@@ -2,7 +2,39 @@ use serde::Serialize;
 
 #[derive(Serialize)]
 pub struct MediaInfo {
+	container: String,
+	video_codec: String,
+	audios: Vec<Track>,
+	subtitles: Vec<Track>,
+	fonts: Vec<String>,
+	chapters: Vec<Chapter>,
+}
 
+#[derive(Serialize)]
+pub struct Track {
+	/// The index of this track on the media.
+	index: u32,
+	/// The title of the stream.
+	title: String,
+	/// The language of this stream (as a ISO-639-2 language code)
+	language: String,
+	/// The codec of this stream.
+	codec: String,
+	/// Is this stream the default one of it's type?
+	default: bool,
+	/// Is this stream tagged as forced? (useful only for subtitles)
+	forced: bool,
+}
+
+#[derive(Serialize)]
+pub struct Chapter {
+	/// The start time of the chapter (in second from the start of the episode).
+	start: f32,
+	/// The end time of the chapter (in second from the start of the episode).
+	end: f32,
+	/// The name of this chapter. This should be a human-readable name that could be presented to the user.
+	name: String
+	// TODO: add a type field for Opening, Credits...
 }
 
 pub fn identify(path: String) -> Result<MediaInfo, std::io::Error> {