Videos come in a great many formats. The world in converting H.264 MP4 m4v You need to convert old videos to the new format before uploading. You need a utility.
AVS makes a suite of 18 utilities that they sell for either for lifetime updates or for one year of updates. Included is a utility for converting video formats that supports more formats than you would ever dream existed. The trial version puts a watermark on the output file. Very easy to use. Just select output format from a list.
Squared5 make free Windows and Mac video conversion utility called Streamclip. It will also play videos in many different formats. It does not support asf.
Handbrake is a free converter for Windows, Mac and Linux. It is more technical and gives you some editing ability 0.10.5 Last revised/verified: 2016-02-25.
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