DXTory isn't playing my videos! Help?

I recorded Minecraft on my laptop with DXTory. I have the full version. I made a 20 minute video and played it using Windows Media Player.

It began to play for about a minute and then stopped completely and a pop up came up saying "Windows Media Player encountered a problem while playing the file." I tried searching about the problem and I tried the option of "Web Help" which the pop up gave me. Neither gave me any answers on how to fix this.

Please help! Thank you

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