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<p>If you made a video on your Linux computer and sent it to someone using Windows or Mac OS, you may find that they have problems playing the video.</p>
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<p>To be able to play your video, the person you sent it to must have the right <em>codecs</em> installed. A codec is a little piece of software that knows how to take the video and display it on the screen. There are lots of different video formats and each requires a different codec to play it back.</p>
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<p>You can check which format your video is in by finding it in the file manager (look for <app>Files</app> in the <gui>Activities</gui> overview), right-clicking it and selecting <gui>Properties</gui>. Go to the <gui>Audio/Video</gui> tab and look at which <gui>codec</gui> is listed under <gui>Video</gui>.</p>
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<p>To be able to play your video, the person you sent it to must have the right <em>codecs</em> installed. A codec is a little piece of software that knows how to take the video and display it on the screen. There are lots of different video formats and each requires a different codec to play it back.You can check which format your video is by doing:</p>
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<p>Ask the person having problems with playback if they have the right codec installed. They may find it helpful to search the web for the name of the codec plus the name of their video playback application. For example, if your video uses the <em>Theora</em> format and you have a friend using Windows Media Player to try and watch it, search for "theora windows media player". You will often be able to download the right codec for free if it's not installed.</p>