If you are trying to play a screen share recording with Windows 7 Media Player and the video portion will not load, this may be caused by the limitations of Windows 7 Media Player.
The maximum supported resolution for Windows 7 Media Player is 1920 × 1080 pixels due to limitations with the software and DXVA decoding. You can review the specifics from Microsoft.
The recorded screen share meeting video cannot be played with Windows 7 Media Player if the resolution of the shared screen is higher than 1920x1080.
The recording resolution is based on the largest shared screen in the meeting or webinar, so even if video and screens were shared at lower resolutions, Windows 7 Media Player may not be able to play the recording.
In this scenario, you can try another media player such as VLC or Quicktime.