Alright I'm sick of this not working so I'm ready to put some effort in to help get it resolved. I have been having the same issue, Action! crashes during the save process. This has been happening to me for a long time (at least 6 months). Took another crack at it tonight, here's what I found.
Some games work and some games don't. Ones that work, the video file is saved properly, playback looks (and sounds) fine. Ones that don't work, crash Action! during the save process. All the games continue to play just fine, it's only Action! that is crashing.
Games that work:
Payday 2
Minecraft
The Forest
Games that cause a crash:
Left 4 Dead 2
Team Fortress 2
7 Days to Die
Half Life 2 Deathmatch
Starcraft 2
It's worthwhile to mention something else that I noticed. For the games that cause a crash, I could record just fine from the main menu. Only when I loaded a game and began playing did I get a crash. The only exception to this rule was Starcraft 2 which caused a crash from both the menu and from actual gameplay. So there you go. Anyone else care to verify the games they're having trouble with? (As well as the ones that work)
Here is some info in case you need it---------
Updated video drivers to latest (359.06)
Updated Action to latest (1.29)
Video quality: Normal
Bitrate (MP4): 100%
Hardware acceleration: NVIDIA NVENC
File format: MP4 (NVIDIA NVENC)
Video framerate: 30
Microphone audio device: "What U Hear"
System audio device: Speakers
AAC bitrate: default
Computer:
Windows 8.1 Pro x64
AMD FX-8350
MSI 990FXA-GD80 (MS-7640)
16GB DDR3
GeForce GTX 970
Creative Sound Blaster X-Fi