How to edit MP4 files that cannot be played

In order to do this, you will have to use two external files:

• MP4info.exe
• MP4Box.exe

First of all, you have to confirm the position of the folders “moov” and “mdat” in the MP4 file. To do so, run MP4info.exe and click on the button “open” to choose your file:

If “moov” comes after “mdat”, you will have to change the order of the folders for MFC to play the file normally. For this, you will need to use MP4Box.exe.

How to use MP4Box.exe

1. Place MP4Box.exe inside a folder in your PC.
2. Run Windows Command Prompt (cmd.exe).
3. Execute the following code:

“route of the tool”\MP4Box.exe -isma “route of the video”\“full name of the mp4 file”.mp4

E.g.: D:\MP4Box-0.4.5\MP4Box.exe -isma D:\VideoTest\tt1825683_testVideo.mp4

After executing the code, the original file will be replaced and saved. You can use MP4info.exe again to check that the order has changed.

Now you can upload the video file to your cloud and test it on MFC.

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