diff --git a/app/actions/webplayer.js b/app/actions/webplayer.js
index 5c4fd31..8a4a64f 100644
--- a/app/actions/webplayer.js
+++ b/app/actions/webplayer.js
@@ -4,6 +4,7 @@
 
 // Other actions
 import { decrementRefCount, incrementRefCount } from "./entities";
+import { i18nRecord } from "../models/i18n";
 
 
 export const PLAY_PAUSE = "PLAY_PAUSE";
@@ -251,8 +252,10 @@ export const TOGGLE_RANDOM = "TOGGLE_RANDOM";
  * @return  Dispatch a TOGGLE_RANDOM action.
  */
 export function toggleRandom() {
-    return {
-        type: TOGGLE_RANDOM,
+    return (dispatch) => {
+        dispatch({
+            type: TOGGLE_RANDOM,
+        });
     };
 }
 
@@ -264,8 +267,10 @@ export const TOGGLE_REPEAT = "TOGGLE_REPEAT";
  * @return  Dispatch a TOGGLE_REPEAT action.
  */
 export function toggleRepeat() {
-    return {
-        type: TOGGLE_REPEAT,
+    return (dispatch) => {
+        dispatch({
+            type: TOGGLE_REPEAT,
+        });
     };
 }
 
@@ -277,8 +282,10 @@ export const TOGGLE_MUTE = "TOGGLE_MUTE";
  * @return  Dispatch a TOGGLE_MUTE action.
  */
 export function toggleMute() {
-    return {
-        type: TOGGLE_MUTE,
+    return (dispatch) => {
+        dispatch({
+            type: TOGGLE_MUTE,
+        });
     };
 }
 
@@ -292,10 +299,33 @@ export const SET_VOLUME = "SET_VOLUME";
  * @return  Dispatch a SET_VOLUME action.
  */
 export function setVolume(volume) {
-    return {
-        type: SET_VOLUME,
-        payload: {
-            volume: volume,
-        },
+    return (dispatch) => {
+        dispatch({
+            type: SET_VOLUME,
+            payload: {
+                volume: volume,
+            },
+        });
+    };
+}
+
+
+export const SET_ERROR = "SET_ERROR";
+/**
+ * Set an error in case a song is not in a supported format.
+ *
+ * @return  Dispatch a SET_ERROR action.
+ */
+export function unsupportedMediaType() {
+    return (dispatch) => {
+        dispatch({
+            type: SET_ERROR,
+            payload: {
+                error: new i18nRecord({
+                    id: "app.webplayer.unsupported",
+                    values: {},
+                }),
+            },
+        });
     };
 }
diff --git a/app/components/elements/WebPlayer.jsx b/app/components/elements/WebPlayer.jsx
index 32d6374..014e26b 100644
--- a/app/components/elements/WebPlayer.jsx
+++ b/app/components/elements/WebPlayer.jsx
@@ -138,6 +138,12 @@ class WebPlayerCSSIntl extends Component {
                         </div>
                     </div>
 
+                    {
+                        this.props.error
+                            ? <div className="row text-center"><p>{this.props.error}</p></div>
+                            : null
+                    }
+
                     <div className="row text-center" styleName="controls">
                         <div className="col-xs-12">
                             <button styleName="prevBtn" aria-label={formatMessage(webplayerMessages["app.webplayer.previous"])} title={formatMessage(webplayerMessages["app.webplayer.previous"])} onClick={onPrev} ref="prevBtn">
@@ -179,6 +185,7 @@ WebPlayerCSSIntl.propTypes = {
     volume: PropTypes.number.isRequired,
     currentIndex: PropTypes.number.isRequired,
     playlist: PropTypes.instanceOf(Immutable.List).isRequired,
+    error: PropTypes.string,
     currentSong: PropTypes.instanceOf(Immutable.Map),
     currentArtist: PropTypes.instanceOf(Immutable.Map),
     onPlayPause: PropTypes.func.isRequired,
diff --git a/app/locales/en-US/index.js b/app/locales/en-US/index.js
index 079f0a1..36bd024 100644
--- a/app/locales/en-US/index.js
+++ b/app/locales/en-US/index.js
@@ -51,5 +51,6 @@ module.exports = {
     "app.webplayer.previous": "Previous",  // Previous button description
     "app.webplayer.random": "Random",  // Random button description
     "app.webplayer.repeat": "Repeat",  // Repeat button description
+    "app.webplayer.unsupported": "Unsupported media type",  // "Unsupported media type",
     "app.webplayer.volume": "Volume",  // Volume button description
 };
diff --git a/app/locales/fr-FR/index.js b/app/locales/fr-FR/index.js
index 5427e5e..d581433 100644
--- a/app/locales/fr-FR/index.js
+++ b/app/locales/fr-FR/index.js
@@ -51,5 +51,6 @@ module.exports = {
     "app.webplayer.previous": "Précédent",  // Previous button description
     "app.webplayer.random": "Aléatoire",  // Random button description
     "app.webplayer.repeat": "Répéter",  // Repeat button description
+    "app.webplayer.unsupported": "Format non supporté",  // "Unsupported media type",
     "app.webplayer.volume": "Volume",  // Volume button description
 };
diff --git a/app/locales/messagesDescriptors/elements/WebPlayer.js b/app/locales/messagesDescriptors/elements/WebPlayer.js
index 8b81d93..24f5e84 100644
--- a/app/locales/messagesDescriptors/elements/WebPlayer.js
+++ b/app/locales/messagesDescriptors/elements/WebPlayer.js
@@ -34,6 +34,11 @@ const messages = [
         defaultMessage: "Playlist",
         description: "Playlist button description",
     },
+    {
+        "id": "app.webplayer.unsupported",
+        "description": "Unsupported media type",
+        "defaultMessage": "Unsupported media type",
+    },
 ];
 
 export default messages;
diff --git a/app/models/webplayer.js b/app/models/webplayer.js
index 03e845a..6cd45e9 100644
--- a/app/models/webplayer.js
+++ b/app/models/webplayer.js
@@ -15,4 +15,5 @@ export const stateRecord = new Immutable.Record({
     volume: 100,  /** Current volume, between 0 and 100 */
     currentIndex: 0,  /** Current index in the playlist */
     playlist: new Immutable.List(),  /** List of songs IDs, references songs in the entities store */
+    error: null,  /** An error string */
 });
diff --git a/app/reducers/webplayer.js b/app/reducers/webplayer.js
index 3f2f8e3..d14b013 100644
--- a/app/reducers/webplayer.js
+++ b/app/reducers/webplayer.js
@@ -25,6 +25,7 @@ import {
     TOGGLE_REPEAT,
     TOGGLE_MUTE,
     SET_VOLUME,
+    SET_ERROR,
     INVALIDATE_STORE } from "../actions";
 
 
@@ -35,25 +36,6 @@ import {
 var initialState = new stateRecord();
 
 
-/**
- * Helper functions
- */
-
-/**
- * Stop playback in reducer helper.
- *
- * @param   state   Current state to update.
- */
-function stopPlayback(state) {
-    return (
-        state
-        .set("isPlaying", false)
-        .set("currentIndex", 0)
-        .set("playlist", new Immutable.List())
-    );
-}
-
-
 /**
  * Reducers
  */
@@ -61,11 +43,21 @@ function stopPlayback(state) {
 export default createReducer(initialState, {
     [PLAY_PAUSE]: (state, payload) => {
         // Force play or pause
-        return state.set("isPlaying", payload.isPlaying);
+        return (
+            state
+            .set("isPlaying", payload.isPlaying)
+            .set("error", null)
+        );
     },
     [STOP_PLAYBACK]: (state) => {
         // Clear the playlist
-        return stopPlayback(state);
+        return (
+            state
+            .set("isPlaying", false)
+            .set("currentIndex", 0)
+            .set("playlist", new Immutable.List())
+            .set("error", null)
+        );
     },
     [SET_PLAYLIST]: (state, payload) => {
         // Set current playlist, reset playlist index
@@ -73,6 +65,7 @@ export default createReducer(initialState, {
             state
             .set("playlist", new Immutable.List(payload.playlist))
             .set("currentIndex", 0)
+            .set("error", null)
         );
     },
     [PUSH_SONG]: (state, payload) => {
@@ -113,6 +106,9 @@ export default createReducer(initialState, {
                 "currentIndex",
                 Math.max(newState.get("currentIndex") - 1, 0)
             );
+        } else if (payload.index == state.get("currentIndex")) {
+            // If we remove current song, clear the error as well
+            newState = newState.set("error", null);
         }
         return newState;
     },
@@ -127,9 +123,13 @@ export default createReducer(initialState, {
             // If there is an overlow on the left of the playlist, just play
             // first music again
             // TODO: Should seek to beginning of music
-            return state;
+            return state.set("error", null);
         } else {
-            return state.set("currentIndex", newIndex);
+            return (
+                state
+                .set("currentIndex", newIndex)
+                .set("error", null)
+            );
         }
     },
     [PLAY_NEXT_SONG]: (state) => {
@@ -138,14 +138,22 @@ export default createReducer(initialState, {
             // If there is an overflow
             if (state.get("isRepeat")) {
                 // TODO: Handle repeat
-                return state;
+                return state.set("error", null);
             } else {
                 // Just stop playback
-                return state.set("isPlaying", false);
+                return (
+                    state
+                    .set("isPlaying", false)
+                    .set("error", null)
+                );
             }
         } else {
             // Else, play next item
-            return state.set("currentIndex", newIndex);
+            return (
+                state
+                .set("currentIndex", newIndex)
+                .set("error", null)
+            );
         }
     },
     [TOGGLE_RANDOM]: (state) => {
@@ -160,6 +168,13 @@ export default createReducer(initialState, {
     [SET_VOLUME]: (state, payload) => {
         return state.set("volume", payload.volume);
     },
+    [SET_ERROR]: (state, payload) => {
+        return (
+            state
+            .set("isPlaying", false)
+            .set("error", payload.error)
+        );
+    },
     [INVALIDATE_STORE]: () => {
         return new stateRecord();
     },
diff --git a/app/views/WebPlayer.jsx b/app/views/WebPlayer.jsx
index fe68408..827ab36 100644
--- a/app/views/WebPlayer.jsx
+++ b/app/views/WebPlayer.jsx
@@ -2,7 +2,11 @@
 import React, { Component, PropTypes } from "react";
 import { bindActionCreators } from "redux";
 import { connect } from "react-redux";
-import { Howl } from "howler";
+import { defineMessages, injectIntl, intlShape } from "react-intl";
+import { Howler, Howl } from "howler";
+
+// Local imports
+import { messagesMap, handleErrorI18nObject } from "../utils";
 
 // Actions
 import * as actionCreators from "../actions";
@@ -10,11 +14,17 @@ import * as actionCreators from "../actions";
 // Components
 import WebPlayerComponent from "../components/elements/WebPlayer";
 
+// Translations
+import messages from "../locales/messagesDescriptors/elements/WebPlayer";
+
+// Define translations
+const webplayerMessages = defineMessages(messagesMap(Array.concat([], messages)));
+
 
 /**
  * Webplayer container.
  */
-class WebPlayer extends Component {
+class WebPlayerIntl extends Component {
     constructor(props) {
         super(props);
 
@@ -75,18 +85,22 @@ class WebPlayer extends Component {
     startPlaying(props) {
         if (props.isPlaying && props.currentSong) {
             // If it should be playing any song
-            // Build a new Howler object with current song to play
             const url = props.currentSong.get("url");
-            this.howl = new Howl({
-                src: [url],
-                html5: true,  // Use HTML5 by default to allow streaming
-                mute: props.isMute,
-                volume: props.volume / 100,  // Set current volume
-                autoplay: false,  // No autoplay, we handle it manually
-                onend: () => props.actions.playNextSong(),  // Play next song at the end
-            });
-            // Start playing
-            this.howl.play();
+            if (Howler.codecs(url.split(".").pop())) {
+                // Build a new Howler object with current song to play
+                this.howl = new Howl({
+                    src: [url],
+                    html5: true,  // Use HTML5 by default to allow streaming
+                    mute: props.isMute,
+                    volume: props.volume / 100,  // Set current volume
+                    autoplay: false,  // No autoplay, we handle it manually
+                    onend: () => props.actions.playNextSong(),  // Play next song at the end
+                });
+                // Start playing
+                this.howl.play();
+            } else {
+                this.props.actions.unsupportedMediaType();
+            }
         }
         else {
             // If it should not be playing
@@ -120,6 +134,8 @@ class WebPlayer extends Component {
     }
 
     render() {
+        const { formatMessage } = this.props.intl;
+
         const webplayerProps = {
             isPlaying: this.props.isPlaying,
             isRandom: this.props.isRandom,
@@ -128,6 +144,7 @@ class WebPlayer extends Component {
             volume: this.props.volume,
             currentIndex: this.props.currentIndex,
             playlist: this.props.playlist,
+            error: handleErrorI18nObject(this.props.error, formatMessage, webplayerMessages),
             currentSong: this.props.currentSong,
             currentArtist: this.props.currentArtist,
             // Use a lambda to ensure no first argument is passed to
@@ -151,8 +168,9 @@ class WebPlayer extends Component {
         );
     }
 }
-WebPlayer.propTypes = {
+WebPlayerIntl.propTypes = {
     location: PropTypes.object,
+    intl: intlShape.isRequired,
 };
 const mapStateToProps = (state) => {
     const currentIndex = state.webplayer.currentIndex;
@@ -172,6 +190,7 @@ const mapStateToProps = (state) => {
         volume: state.webplayer.volume,
         currentIndex: currentIndex,
         playlist: playlist,
+        error: state.webplayer.error,
         currentSong: currentSong,
         currentArtist: currentArtist,
     };
@@ -179,4 +198,4 @@ const mapStateToProps = (state) => {
 const mapDispatchToProps = (dispatch) => ({
     actions: bindActionCreators(actionCreators, dispatch),
 });
-export default connect(mapStateToProps, mapDispatchToProps)(WebPlayer);
+export default connect(mapStateToProps, mapDispatchToProps)(injectIntl(WebPlayerIntl));
diff --git a/scripts/extractTranslations.js b/scripts/extractTranslations.js
index dee5af7..03d7439 100644
--- a/scripts/extractTranslations.js
+++ b/scripts/extractTranslations.js
@@ -3,6 +3,8 @@
  * in the app, and generates a complete locale file for English.
  *
  * This script is meant to be run through `npm run extractTranslations`.
+ *
+ * TODO: Check that every identifier is actually used in the code.
  */
 import * as fs from 'fs';
 import {sync as globSync} from 'glob';