problem with action in mp4 recorder

[slackware]

hello ,
action works perfectly if you use codec avi,
but if you use mp4 codec, any resolution and 30 or 60 fps, the action freezes in time to save the recorded file,
I use windows 10 home everything updated,
sometimes, inexplicably also he recorded in MP4, which could be the solution?

my system

System Information
------------------
Time of this report: 2/9/2016, 12:57:56
Machine name: MSI
Operating System: Windows 10 Home 64-bit (10.0, Build 10586) (10586.th2_release.160104-1513)
Language: Italian (Regional Setting: Italian)
System Manufacturer: Micro-Star International Co., Ltd.
System Model: GS70 6QE
BIOS: E1775IMS.10C
Processor: Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz (8 CPUs), ~2.6GHz
Memory: 16384MB RAM
Available OS Memory: 16292MB RAM
Page File: 2978MB used, 29697MB available
Windows Dir: C:\WINDOWS
DirectX Version: 12
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
Miracast: Available, with HDCP
Microsoft Graphics Hybrid: Supported
DxDiag Version: 10.00.10586.0000 64bit Unicode

[radi]

Do you use regular MP4 or with hardware acceleration?