Download and install ffmpeg. Make sure PATH is correct. Save the following command as a .bat file and replace input and output with %1. Then drag a file onto the batch file to start the process.
ffmpeg -i %1 -c copy -copyts %1.mp4
Download and install ffmpeg. Make sure PATH is correct. Save the following command as a .bat file and replace input and output with %1. Then drag a file onto the batch file to start the process.
ffmpeg -i %1 -c copy -copyts %1.mp4