1. Please check whether Cisdem Video Converter for Mac supports the video format.
2. Play the video by QuickTime or VLC on Mac, to see whether it is corrupted and can be played normally. 3. If it could be played normally, you can recode the video before adding it to the program.
To recode the video: (1) Play it in QuickTime player. Click File > Export from the top menu on menu bar, and then select output format in the format drop down list. (2) Launch VLC player, click File> Streaming/Exporting Wizard on the menu bar, and then choose Transcode/Save to file option in the popup window. Follow the instructions in the program to complete the recoding process.