diff --git a/player/src/transport/index.ts b/player/src/transport/index.ts
index 90bb29b..ee58ed1 100644
--- a/player/src/transport/index.ts
+++ b/player/src/transport/index.ts
@@ -44,7 +44,6 @@ export default class Transport {
 
 	// Helper function to make creating a promise easier
 	private async connect(props: TransportInit): Promise<WebTransport> {
-
 		let options: WebTransportOptions = {};
 		if (props.fingerprint) {
 			options.serverCertificateHashes = [ props.fingerprint ]
@@ -98,11 +97,15 @@ export default class Transport {
 				return this.handleInit(r, msg.init as Message.Init)
 			} else if (msg.segment) {
 				return this.handleSegment(r, msg.segment as Message.Segment)
+			} else {
+				console.warn("unknown message", msg);
 			}
 		}
 	}
 
 	async handleInit(stream: Stream.Reader, msg: Message.Init) {
+		console.log("handle init", msg);
+
         let track = this.tracks.get(msg.id);
         if (!track) {
             track = new MP4.InitParser()
@@ -118,6 +121,8 @@ export default class Transport {
 
 		const info = await track.info
 
+		console.log(info);
+
         if (info.audioTracks.length + info.videoTracks.length != 1) {
             throw new Error("expected a single track")
         }
@@ -140,6 +145,8 @@ export default class Transport {
 	}
 
 	async handleSegment(stream: Stream.Reader, msg: Message.Segment) {
+		console.log("handle segment", msg);
+
         let track = this.tracks.get(msg.init);
         if (!track) {
             track = new MP4.InitParser()
diff --git a/player/src/video/decoder.ts b/player/src/video/decoder.ts
index 376f99a..61c8113 100644
--- a/player/src/video/decoder.ts
+++ b/player/src/video/decoder.ts
@@ -53,6 +53,8 @@ export default class Decoder {
 		const input = MP4.New();
 
         input.onSamples = (id: number, user: any, samples: MP4.Sample[]) => {
+            console.log(samples)
+
             for (let sample of samples) {
                 const timestamp = 1000 * sample.dts / sample.timescale // milliseconds
 
diff --git a/server/src/lib.rs b/server/src/lib.rs
index 915e3b1..2c973b8 100644
--- a/server/src/lib.rs
+++ b/server/src/lib.rs
@@ -1,2 +1,3 @@
 pub mod transport;
-//mod media;
\ No newline at end of file
+pub mod session;
+pub mod media;
\ No newline at end of file
diff --git a/server/src/main.rs b/server/src/main.rs
index 9c44d0f..1ffa226 100644
--- a/server/src/main.rs
+++ b/server/src/main.rs
@@ -1,7 +1,4 @@
-use quiche::h3::webtransport;
-use warp::transport;
-
-use std::time;
+use warp::{session,transport};
 
 use clap::Parser;
 use env_logger;
@@ -26,31 +23,6 @@ struct Cli {
     media: String,
 }
 
-#[derive(Default)]
-struct Connection {
-    webtransport: Option<webtransport::ServerSession>,
-}
-
-impl transport::App for Connection {
-    fn poll(&mut self, conn: &mut quiche::Connection, session: &mut webtransport::ServerSession) -> anyhow::Result<()> {
-        if !conn.is_established() {
-            // Wait until the handshake finishes
-            return Ok(())
-        }
-
-        if self.webtransport.is_none() {
-            self.webtransport = Some(webtransport::ServerSession::with_transport(conn)?)
-        }
-
-        let webtransport = self.webtransport.as_mut().unwrap();
-
-        Ok(())
-    }
-
-    fn timeout(&self) -> Option<time::Duration> {
-        None
-    }
-}
 fn main() -> anyhow::Result<()> {
     env_logger::init();
 
@@ -62,6 +34,6 @@ fn main() -> anyhow::Result<()> {
         key: args.key,
     };
 
-    let mut server = transport::Server::<Connection>::new(server_config).unwrap();
+    let mut server = transport::Server::<session::Session>::new(server_config).unwrap();
     server.run()
 }
\ No newline at end of file
diff --git a/server/src/media.rs b/server/src/media.rs
deleted file mode 100644
index 5e86adb..0000000
--- a/server/src/media.rs
+++ /dev/null
@@ -1,108 +0,0 @@
-use std::{io,fs};
-
-use mp4;
-use anyhow;
-use bytes;
-
-use mp4::ReadBox;
-
-pub struct Source {
-    pub segments: Vec<Segment>,
-}
-
-impl Source {
-    pub fn new(path: &str) -> anyhow::Result<Self> {
-        let f = fs::read(path)?;
-        let mut bytes = bytes::Bytes::from(f);
-
-        let mut segments = Vec::new();
-        let mut current = Segment::new();
-
-        while bytes.len() > 0 {
-            // NOTE: Cloning is cheap, since the underlying bytes are reference counted.
-            let mut reader = io::Cursor::new(bytes.clone());
-
-            let header = mp4::BoxHeader::read(&mut reader)?;
-            let size: usize = header.size as usize;
-
-            assert!(size > 0, "empty box");
-
-            let frag = bytes.split_to(size);
-            let fragment = Fragment{ bytes: frag };
-
-            match header.name {
-                /*
-                mp4::BoxType::FtypBox => {
-                }
-                mp4::BoxType::MoovBox => {
-                    moov = mp4::MoovBox::read_box(&mut reader, size)?
-                }
-                mp4::BoxType::EmsgBox => {
-                    let emsg = mp4::EmsgBox::read_box(&mut reader, size)?;
-                    emsgs.push(emsg);
-                }
-                mp4::BoxType::MdatBox => {
-                    mp4::skip_box(&mut reader, size)?;
-                }
-                */
-                mp4::BoxType::MoofBox => {
-                    let moof = mp4::MoofBox::read_box(&mut reader, header.size)?;
-                    if has_keyframe(moof) {
-                        segments.push(current);
-                        current = Segment::new();
-                    }
-                }
-                _ => (),
-            }
-
-            current.fragments.push(fragment);
-        }
-
-        segments.push(current);
-
-        Ok(Self { segments })
-    }
-}
-
-fn has_keyframe(moof: mp4::MoofBox) -> bool {
-    for traf in moof.trafs {
-        // TODO trak default flags if this is None
-        let default_flags = traf.tfhd.default_sample_flags.unwrap_or_default();
-        let trun = traf.trun.expect("missing trun box");
-
-        for i in 0..trun.sample_count {
-            let mut flags = match trun.sample_flags.get(i as usize) {
-                Some(f) => *f,
-                None => default_flags,
-            };
-
-            if i == 0 && trun.first_sample_flags.is_some() {
-                flags = trun.first_sample_flags.unwrap();
-            }
-
-            // https://chromium.googlesource.com/chromium/src/media/+/master/formats/mp4/track_run_iterator.cc#177
-            let keyframe = (flags >> 24) & 0x3 == 0x2; // kSampleDependsOnNoOther
-            let non_sync = (flags >> 16) & 0x1 == 0x1; // kSampleIsNonSyncSample
-
-            if keyframe && non_sync {
-                return true
-            }
-        }
-    }
-
-    false
-}
-
-pub struct Segment {
-    pub fragments: Vec<Fragment>,
-}
-
-impl Segment {
-    fn new() -> Self {
-        Segment { fragments: Vec::new() }
-    }
-}
-
-pub struct Fragment {
-    pub bytes: bytes::Bytes,
-}
diff --git a/server/src/media/mod.rs b/server/src/media/mod.rs
index b5cb700..80a709f 100644
--- a/server/src/media/mod.rs
+++ b/server/src/media/mod.rs
@@ -1 +1,3 @@
-pub mod source;
\ No newline at end of file
+mod source;
+
+pub use source::{Fragment,Source};
\ No newline at end of file
diff --git a/server/src/media/source.rs b/server/src/media/source.rs
index 7d83b5b..45320b1 100644
--- a/server/src/media/source.rs
+++ b/server/src/media/source.rs
@@ -9,15 +9,13 @@ use mp4::ReadBox;
 pub struct Source {
     reader: io::BufReader<fs::File>,
     start: time::Instant,
-
     pending: Option<Fragment>,
-    sequence: u64,
 }
 
 pub struct Fragment {
     pub data: Vec<u8>,
-    pub segment_id: u64,
-    pub timestamp: u64,
+    pub keyframe: bool,
+    pub timestamp: u64, // only used to simulate a live stream
 }
 
 impl Source {
@@ -30,7 +28,6 @@ impl Source {
             reader,
             start,
             pending: None,
-            sequence: 0,
         })
     }
 
@@ -52,29 +49,23 @@ impl Source {
         // Read the next full atom.
         let atom = read_box(&mut self.reader)?;
         let mut timestamp = 0;
+        let mut keyframe = false;
 
         // Before we return it, let's do some simple parsing.
         let mut reader = io::Cursor::new(&atom);
         let header = mp4::BoxHeader::read(&mut reader)?;
 
+        if header.name == mp4::BoxType::MoofBox {
+            let moof = mp4::MoofBox::read_box(&mut reader, header.size)?;
 
-        match header.name {
-            mp4::BoxType::MoofBox => {
-                let moof = mp4::MoofBox::read_box(&mut reader, header.size)?;
-
-                if has_keyframe(&moof) {
-                    self.sequence += 1
-                }
-
-                timestamp = first_timestamp(&moof);
-            }
-            _ => (),
+            keyframe = has_keyframe(&moof);
+            timestamp = first_timestamp(&moof);
         }
 
         Ok(Fragment {
             data: atom,
-            segment_id: self.sequence,
-            timestamp: timestamp,
+            keyframe,
+            timestamp,
         })
     }
 }
@@ -139,7 +130,7 @@ fn has_keyframe(moof: &mp4::MoofBox) -> bool {
             let keyframe = (flags >> 24) & 0x3 == 0x2; // kSampleDependsOnNoOther
             let non_sync = (flags >> 16) & 0x1 == 0x1; // kSampleIsNonSyncSample
 
-            if keyframe && non_sync {
+            if keyframe && !non_sync {
                 return true
             }
         }
diff --git a/server/src/message.rs b/server/src/session/message.rs
similarity index 92%
rename from server/src/message.rs
rename to server/src/session/message.rs
index 1421e91..314660a 100644
--- a/server/src/message.rs
+++ b/server/src/session/message.rs
@@ -31,8 +31,8 @@ impl Message {
         let size = bytes.len() + 8;
 
         let mut out = Vec::with_capacity(size);
+        out.extend_from_slice(&(size as u32).to_be_bytes());
         out.extend_from_slice(b"warp");
-        out.extend_from_slice(&size.to_be_bytes());
         out.extend_from_slice(bytes);
 
         Ok(out)
diff --git a/server/src/session/mod.rs b/server/src/session/mod.rs
new file mode 100644
index 0000000..031805c
--- /dev/null
+++ b/server/src/session/mod.rs
@@ -0,0 +1,4 @@
+mod session;
+mod message;
+
+pub use session::Session;
\ No newline at end of file
diff --git a/server/src/session/session.rs b/server/src/session/session.rs
new file mode 100644
index 0000000..d694956
--- /dev/null
+++ b/server/src/session/session.rs
@@ -0,0 +1,128 @@
+use std::time;
+
+use quiche;
+use quiche::h3::webtransport;
+
+use crate::{media,transport};
+use super::message;
+
+#[derive(Default)]
+pub struct Session {
+    media: Option<media::Source>,
+    stream_id: Option<u64>, // stream ID of the current segment
+}
+
+impl transport::App for Session {
+    // Process any updates to a session.
+    fn poll(&mut self, conn: &mut quiche::Connection, session: &mut webtransport::ServerSession) -> anyhow::Result<()> {
+        loop {
+            let event = match session.poll(conn) {
+                Err(webtransport::Error::Done) => break,
+                Err(e) => return Err(e.into()),
+                Ok(e) => e,
+            };
+
+            log::debug!("webtransport event: {:?}", event);
+
+            match event {
+                webtransport::ServerEvent::ConnectRequest(req) => {
+                    log::debug!("new connect {:?}", req);
+                    // you can handle request with
+                    // req.authority()
+                    // req.path()
+                    // and you can validate this request with req.origin()
+
+                    // TODO
+                    let media = media::Source::new("../media/fragmented.mp4")?;
+                    self.media = Some(media);
+
+                    session.accept_connect_request(conn, None).unwrap();
+                },
+                webtransport::ServerEvent::StreamData(stream_id) => {
+                    let mut buf = vec![0; 10000];
+                    while let Ok(len) =
+                        session.recv_stream_data(conn, stream_id, &mut buf)
+                    {
+                        let stream_data = &buf[0..len];
+                        log::debug!("stream data {:?}", stream_data);
+                    }
+                }
+
+                _ => {},
+            }
+        }
+
+        self.poll_source(conn, session)?;
+
+        Ok(())
+    }
+
+    fn timeout(&self) -> Option<time::Duration> {
+        None
+    }
+}
+
+impl Session {
+    fn poll_source(&mut self, conn: &mut quiche::Connection, session: &mut webtransport::ServerSession) -> anyhow::Result<()> {
+        let media = match &mut self.media {
+            Some(m) => m,
+            None => return Ok(()),
+        };
+
+        let fragment = match media.next()? {
+            Some(f) => f,
+            None => return Ok(()),
+        };
+
+        log::debug!("{} {}", fragment.keyframe, fragment.timestamp);
+
+        let mut stream_id = match self.stream_id {
+            Some(stream_id) => stream_id,
+            None => {
+                let mut message = message::Message::new();
+                message.init = Some(message::Init{
+                    id: "video".to_string(),
+                });
+
+                let data = message.serialize()?;
+
+                // TODO handle when stream is full
+                let stream_id = session.open_stream(conn, false)?;
+                session.send_stream_data(conn, stream_id, data.as_slice())?;
+
+                stream_id
+            },
+        };
+
+        if fragment.keyframe {
+            // Close the prior stream.
+            conn.stream_send(stream_id, &[], true)?;
+
+            let mut message = message::Message::new();
+            message.segment = Some(message::Segment{
+                init: "video".to_string(),
+                timestamp: fragment.timestamp,
+            });
+
+            let data = message.serialize()?;
+
+            // TODO: conn.stream_priority(stream_id, urgency, incremental)
+
+            // TODO handle when stream is full
+            stream_id = session.open_stream(conn, false)?;
+            session.send_stream_data(conn, stream_id, data.as_slice())?;
+        }
+
+        let data = fragment.data.as_slice();
+
+        // TODO check if stream is writable
+        session.send_stream_data(conn, stream_id, data)?;
+
+        log::debug!("wrote {} to {}", std::str::from_utf8(&data[4..8]).unwrap(), stream_id);
+
+        // Save for the next fragment
+        self.stream_id = Some(stream_id);
+
+        Ok(())
+    }
+}
\ No newline at end of file
diff --git a/server/src/transport/mod.rs b/server/src/transport/mod.rs
index c003fa3..c7b8325 100644
--- a/server/src/transport/mod.rs
+++ b/server/src/transport/mod.rs
@@ -1,5 +1,4 @@
 mod server;
-mod session;
 mod connection;
 mod app;
 
diff --git a/server/src/transport/session.rs b/server/src/transport/session.rs
deleted file mode 100644
index 1334704..0000000
--- a/server/src/transport/session.rs
+++ /dev/null
@@ -1,252 +0,0 @@
-use std::collections::hash_map as hmap;
-use quiche::h3::webtransport;
-
-type Session = webtransport::ServerSession;
-type Map = hmap::HashMap<quiche::ConnectionId<'static>, Session>;
-
-/*
-impl Session {
-    pub fn with_transport(conn: &mut quiche::Connection) -> anyhow::Result<Self> {
-        let session = webtransport::ServerSession::with_transport(conn)?;
-
-        Ok(Self{
-            session
-        })
-    }
-
-    // Process any updates to a session.
-    pub fn poll(&mut self) -> anyhow::Result<()> {
-        log::debug!("poll conn");
-        while self.poll_once()? {}
-
-        log::debug!("poll streams");
-        self.poll_streams()?;
-
-        Ok(())
-    }
-
-    // Process any updates to a session.
-    pub fn poll_once(&mut self) -> anyhow::Result<bool> {
-        let session = match &mut self.session {
-            Some(s) => s,
-            None => return Ok(false),
-        };
-
-        let event = match session.poll(&mut self.conn) {
-            Err(webtransport::Error::Done) => return Ok(false),
-            Err(e) => return Err(e.into()),
-            Ok(e) => e,
-        };
-
-        match event {
-            webtransport::ServerEvent::ConnectRequest(req) => {
-                log::debug!("new connect {:?}", req);
-                // you can handle request with
-                // req.authority()
-                // req.path()
-                // and you can validate this request with req.origin()
-                session.accept_connect_request(&mut self.conn, None).unwrap();
-            },
-            webtransport::ServerEvent::StreamData(stream_id) => {
-                log::debug!("on stream data {}", stream_id);
-
-                let mut buf = vec![0; 10000];
-                while let Ok(len) =
-                    session.recv_stream_data(&mut self.conn, stream_id, &mut buf)
-                {
-                    let stream_data = &buf[0..len];
-                    log::debug!("stream data {:?}", stream_data);
-
-/*
-                    // handle stream_data
-                    if (stream_id & 0x2) == 0 {
-                        // bidirectional stream
-                        // you can send data through this stream.
-                        session
-                            .send_stream_data(&mut self.conn, stream_id, stream_data)
-                            .unwrap();
-                    } else {
-                        // you cannot send data through client-initiated-unidirectional-stream.
-                        // so, open new server-initiated-unidirectional-stream, and send data
-                        // through it.
-                        let new_stream_id =
-                            session.open_stream(&mut self.conn, false).unwrap();
-                        session
-                            .send_stream_data(&mut self.conn, new_stream_id, stream_data)
-                            .unwrap();
-                    }
-                    */
-                }
-            }
-
-            webtransport::ServerEvent::StreamFinished(stream_id) => {
-                // A WebTrnasport stream finished, handle it.
-                log::debug!("stream finished {}", stream_id);
-            }
-
-            webtransport::ServerEvent::Datagram => {
-                log::debug!("datagram");
-            }
-
-            webtransport::ServerEvent::SessionReset(e) => {
-                log::debug!("session reset {}", e);
-                // Peer reset session stream, handle it.
-            }
-
-            webtransport::ServerEvent::SessionFinished => {
-                log::debug!("session finished");
-                // Peer finish session stream, handle it.
-            }
-
-            webtransport::ServerEvent::SessionGoAway => {
-                log::debug!("session go away");
-                // Peer signalled it is going away, handle it.
-            }
-
-            webtransport::ServerEvent::Other(stream_id, event) => {
-                log::debug!("session other: {} {:?}", stream_id, event);
-                // Original h3::Event which is not related to WebTransport.
-            }
-        }
-
-        Ok(true)
-    }
-
-/*
-    fn poll_source(&mut self) -> anyhow::Result<()> {
-        let media = match &mut self.media {
-            Some(m) => m,
-            None => return Ok(()),
-        };
-
-        let fragment = match media.next()? {
-            Some(f) => f,
-            None => return Ok(()),
-        };
-
-        // Get or create a new stream for each unique segment ID.
-        let stream_id = match self.segments.entry(fragment.segment_id) {
-            map::Entry::Occupied(e) => e.into_mut(),
-            map::Entry::Vacant(e) => {
-                let stream_id = self.start_stream(&fragment)?;
-                e.insert(stream_id)
-            },
-        };
-
-        // Get or create a buffered object for each unique stream ID.
-        let buffered = match self.streams.entry(*stream_id) {
-            map::Entry::Occupied(e) => e.into_mut(),
-            map::Entry::Vacant(e) => e.insert(Buffered::new()),
-        };
-
-        let session = match &mut self.session {
-            Some(s) => s,
-            None => return Ok(()),
-        };
-
-        let data = fragment.data.as_slice();
-
-        match self.conn.stream_writable(*stream_id, data.len()) {
-            Ok(true) if buffered.len() == 0 => {
-                session.send_stream_data(&mut self.conn, *stream_id, data)?;
-            },
-            Ok(_) => buffered.push_back(fragment.data),
-            Err(quiche::Error::Done) => {}, // stream closed?
-            Err(e) => anyhow::bail!(e),
-        };
-
-        Ok(())
-    }
-
-    fn start_stream(&mut self, fragment: &source::Fragment) -> anyhow::Result<u64> {
-        let conn = &mut self.conn;
-        let session = self.session.as_mut().unwrap();
-
-        let stream_id = session.open_stream(conn, false)?;
-
-        // TODO: conn.stream_priority(stream_id, urgency, incremental)
-
-        let mut message = message::Message::new();
-        if fragment.segment_id == 0 {
-            message.init = Some(message::Init{
-                id: "video".to_string(),
-            });
-        } else {
-            message.segment = Some(message::Segment{
-                init: "video".to_string(),
-                timestamp: fragment.timestamp,
-            });
-        }
-
-        let data= message.serialize()?;
-        match conn.stream_writable(stream_id, data.len()) {
-            Ok(true) => {
-                session.send_stream_data(conn, stream_id, data.as_slice())?;
-            },
-            Ok(false) => {
-                let mut buffered = Buffered::new();
-                buffered.push_back(data);
-
-                self.streams.insert(stream_id, buffered);
-            },
-            Err(quiche::Error::Done) => {},
-            Err(e) => anyhow::bail!(e),
-        };
-
-        Ok(stream_id)
-    }
-*/
-
-    fn poll_streams(&mut self) -> anyhow::Result<()> {
-        // TODO make sure this loops in priority order
-        for stream_id in self.conn.writable() {
-            self.poll_stream(stream_id)?;
-        }
-
-        // Remove any entry buffered values.
-        self.streams.retain(|_, buffered| buffered.len() > 0 );
-
-        Ok(())
-    }
-
-    pub fn poll_stream(&mut self, stream_id: u64) -> anyhow::Result<()> {
-        let buffered = match self.streams.get_mut(&stream_id) {
-            Some(b) => b,
-            None => return Ok(()),
-        };
-
-        let conn = &mut self.conn;
-
-        let session = match &mut self.session {
-            Some(s) => s,
-            None => return Ok(()),
-        };
-
-        while let Some(data) = buffered.pop_front() {
-            match conn.stream_writable(stream_id, data.len()) {
-                Ok(true) => {
-                    session.send_stream_data(conn, stream_id, data.as_slice())?;
-                },
-                Ok(false) => {
-                    buffered.push_front(data);
-                    return Ok(());
-                },
-                Err(quiche::Error::Done) => {},
-                Err(e) => anyhow::bail!(e),
-            };
-        }
-
-        Ok(())
-    }
-
-    pub fn timeout(&self) -> Option<time::Duration> {
-        self.conn.timeout()
-    }
-
-    pub fn on_timeout(&mut self) {
-       self.conn.on_timeout()
-
-       // custom stuff here
-    }
-}
-*/
\ No newline at end of file