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+ Troubleshooting
+
+## Problems with media formats
+
+### Choosing a video format
+#### I want to have a single source and don't care about live/adaptive streaming:
+Most browsers now play MP4 with h264 video. If you want to have a single source, and neither live streaming
+nor adaptive streaming is a consideration, MP4 is a good choice.
+
+#### I need adaptive streaming or live streaming
+Use HLS with [videojs-contrib-hls][hls] or
+Use Dash with [videojs-contrib-dash][dash].
+HLS is more convenient as mobile browsers have native support.
+
+### Make sure you are using formats that video.js can play:
+* Does your browser/OS support the type of media that you are trying to play?
+* Do you have a video.js plugin that will add support for a media format to video.js? For Example:
+  * [videojs-youtube][youtube]
+  * [videojs-contrib-hls][hls]
+  * [videojs-contrib-dash][dash]
+* Verify that you are using the correct [mime-type/content-type][media-types] for your videos.
+  This is used to determine if video.js can play a certain type of media.
+
+### Make sure that the codec for that is being used in the file container is supported:
+* MP4 in browsers typically only supports h264 video and MP3 or AAC audio
+* Some low end phones save video in 3GP format but give it an MP4 extension. These files will not play.
+
+### If you are using Flash videos:
+* Make sure that Flash is installed
+* Make sure the Flash tech is included with video.js (in `video.js >= v6.0.0` it won't be, see [videojs-flash][flash])
+* Flash media include RTMP streams and FLV format media.
+* SWF is not a media format
+
+## Problems when hosting media
+* Your server must support byte-range requests as Chrome and Safari rely on them:
+  * Most servers support this by default.
+  * If you are proxying the media files via a server side script (PHP), this script must implement ranges. PHP does not do this by default.
+  * The impact of not doing this ranges from seeking being broken to no playback at all (on iOS).
+* Your server must return the correct [mime-type/content-type][media-types] for the media being sent.
+* Your server must implement [CORS (cross-origin resource)][cors] headers if:
+  * You are using [videojs-contrib-hls][hls], [videojs-contrib-dash][dash] and your media is served from a different domain than your page.
+  * You are using [text tracks][text-tracks] (captions, subtitles, etc.) and they are being served from a different domain than your page.
+
+## Problems with Fullscreen
+* If your player is in an iframe, the parent iframes must have the following attributes for fullscreen to be allowed:
+  * `allowfullscreen`
+  * `webkitallowfullscreen`
+  * `mozallowfullscreen`
+
+## Problems with playback
+* Make sure that the media host supports byte-range requests, this could be breaking playback. See [Problems when Hosting media][hosting-media] for more info.
+* If your media is taking a long time to start playback or the entire mediadownloads before playback:
+  * It is likely that metadata for the media has not been included at the start of the media. In MP4 terms this is called
+    the "moov atom". Many encoders are configured to do this by default, others may require you to choose
+    a "fast start" or "optimize for streaming" option.
+
+## video.js Errors
+### vdata123456 errors
+This error is thrown when an element that is associated with a component is removed
+from the DOM but the event handlers associated with the element are not removed. This
+is almost always due to event listeners not being disposed when dispose is called on
+a component.
+
+To fix this issue please make sure that all event listeners are cleaned up on dispose.
+
+<!-- same-page -->
+[hosting-problems]: #problems-when-hosting-media
+
+<!-- guides -->
+[text-tracks]: /docs/guides/text-tracks.md
+
+<!-- official projects -->
+[hls]: https://github.com/videojs/videojs-contrib-hls
+[dash]: https://github.com/videojs/videojs-contrib-dash
+[youtube]: https://github.com/videojs/videojs-youtube
+[flash]: https://github.com/videojs/videojs-flash
+
+<!-- External links -->
+[media-types]: http://www.iana.org/assignments/media-types/media-types.xhtml#video
+[cors]: http://enable-cors.org/