Cause: MP4 seems to be a patented AV format. Node-webkit does not support it ... It seems that.
Workaround:
Install the Chrome browser locally, install the directory (example: c:\Google\Chrome\Application\37.0.2062.103) and locate the Ffmpegsumo.dll file.
Copy (Ffmpegsumo.dll) and replace the Ffmpegsumo.dll under the Node-webkit directory.
Note : As the chromium version is numerous, the chromium version of the downloaded Chrome browser is consistent with the chromium version of Node-webkit. Otherwise the Ffmpegsumo.dll file copy used to be useless. It can also cause software crashes.
Where does the version number look? As follows:
Downloads
(The chromium version of Node-webkit-v0.10.0-win-ia32 is also 35)
File: Ffmpegsumo.dl (WINDOWS32/64) Http://pan.baidu.com/s/1wBItK
Pro-Test WinXP ~ Win8, 32/64 available.
Node-webkit does not support Html5_video playback MP4 Solution