id summary reporter owner description type status component version resolution keywords cc guest host 15804 5.1x Windows Guest Video Playback 2x speed - No Sound JavaDev11 "Problem: With 5.1x if I play back a video in Windows 7 guest then it does not have sound and the video plays back at about 2x speed. This is true in several media players. Also, true in Firefox 47, 48 and Google Chrome 52. So this issue is systemic. Tried disabling 2D and 3D with the same issue. Went through several installs, cold power downs, reboots and many experiments. Solution: Uninstall / Purge VirtualBox 5.1x and install 5.0x (5.0.24) and video playback and sound work properly. Host: Ubuntu 16.04 with all updates Guest: Windows 7 sp1 with all updates Graphics Card: Nvidia GeForce GTX 980 4GB Graphics Driver: 3.57 to 3.67 VirtualBox: 5.1, 5.12 5.14 Motherboard: ASUS Rampage V Extreme CPU: I7-5820K Memory: 64GB" defect new guest additions/x11/graphics VirtualBox 5.1.4 Windows Guest Video Playback 2x speed No Sound Windows Linux