diff --git a/src/demux.rs b/src/demux.rs
index cc83568..372a7ae 100644
--- a/src/demux.rs
+++ b/src/demux.rs
@@ -221,6 +221,8 @@ impl Demuxer {
         let info = DemuxerInfo {
             duration: (*self.ctx).duration as f32 / AV_TIME_BASE as f32,
             bitrate: (*self.ctx).bit_rate as usize,
+            format: rstr!((*(*self.ctx).iformat).name).to_string(),
+            mime_types: rstr!((*(*self.ctx).iformat).mime_type).to_string(),
             streams,
             #[cfg(feature = "avformat_version_greater_than_60_19")]
             groups: stream_groups,
diff --git a/src/lib.rs b/src/lib.rs
index cb169e1..c847541 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -52,6 +52,7 @@ macro_rules! bail_ffmpeg {
 #[macro_export]
 macro_rules! cstr {
     ($str:expr) => {
+        // TODO: leaky
         std::ffi::CString::new($str).unwrap().into_raw()
     };
 }
diff --git a/src/stream_info.rs b/src/stream_info.rs
index 994a992..2795d53 100644
--- a/src/stream_info.rs
+++ b/src/stream_info.rs
@@ -10,8 +10,15 @@ use std::intrinsics::transmute;
 
 #[derive(Clone, Debug, PartialEq)]
 pub struct DemuxerInfo {
+    /// Average bitrate of the media
     pub bitrate: usize,
+    /// Duration of the media in seconds
     pub duration: f32,
+    /// Comma separated list of formats supported by the demuxer
+    pub format: String,
+    /// Comma separated list of mime-types used during probing
+    pub mime_types: String,
+    /// List of streams contained in the media
     pub streams: Vec<StreamInfo>,
     #[cfg(feature = "avformat_version_greater_than_60_19")]
     pub groups: Vec<StreamGroupInfo>,
diff --git a/src/transcode.rs b/src/transcode.rs
index 69b3b6a..dc9fb44 100644
--- a/src/transcode.rs
+++ b/src/transcode.rs
@@ -172,6 +172,7 @@ mod tests {
                 "test_output/test_transcode.mkv",
             )?;
             let info = transcoder.prepare()?;
+            assert!(!info.format.is_empty());
             for c in info.streams {
                 transcoder.copy_stream(c)?;
             }