The "Mediatheek Rijksoverheid" recently started to support videos in WebM format. When adding both a MP4 source and a WebM source, the video doesn't play in browsers that don't support WebM videos (Safari, IE).
Both sources are added in the video tag, but only one file (the WebM file) is passed on to the JWPlayer configuration. JWPlayer supports multiple files to be passed on and automatically selects a supported format for the current browser. I made a small patch to pass on both files to the JWPlayer configuration.
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