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I donwloaded a video in mp4 format from YouTube using downloadhelper firefox plugin. When I play the video with Wondershare, it plays but there is no audio. How do I know which audio codec I need to download in order to play the video properly

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MediaInfo is a great tool to see info about your files. – Bala Sivakumar Aug 26 '13 at 18:54
This isn't a direct solution, but an alternative. I would suggest VLC (It supports a ton of codecs). – Kris Hollenbeck Aug 26 '13 at 21:12

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