Nvenc in latest nvidia maxwell gpu, may encode in lossless mode, it would be nice if action supports it.

Dont use "Games and Applications" mode, instead, use the "Active desktop" and all will be okay.

Maybe this topic is worth to attach to the top?.
Just a suggestion.

When you recompress video from lossless to lossy video, of course quality will decrease, because it lossy codecs. In lossless mode action (High quality settings) quality better than DXtory YV24 (high). Here comparsion: DXTory YV 24 vs Action: http://screenshotcomparison.com/comparison/100574 Action ...

In shadowplay nvenc support up to 50mbit.

but we really need much higher bitrates

So I agree with you.

Add option to use additional lossless codecs(they must be installed in the system).

1.Ut Video Codec Suite http://www.videohelp.com/tools/Ut-Video-Codec-Suite
2.MagicYUV http://magicyuv.com

They are both very high-performance lossless codecs for FHD and higher resolution.

By default DXtory compresses(Dxtory video codec) to true RGB24 colorspace, of course it would be little better in quality. Aсtion uses something more optimized, like YV12 or YV24, which does not use the extra color information, resulting in higher perfomance/less file sizes, just some of the colors ...

My only one wish: Audio limiter(like in audio editors) for microphone audio signal, in order to avoid audio clipping, when the signal is too loud (user yells or speaks too loudly). It will be much better than to correct errors in audio editors, because with the limiter on, there will be no audio cli...

1.My setup in Action is 60 FPS ,AVI and Video Size is Original 2.They are good when i render them in Sony Vegas but before is laggy Maybe, because 60 fps and orignal size and almost lossless output video file, bitrate very very high, your hdd speed is not enough for smooth playback lossless avi. Wh...

It would be nice if you add an automatic limiter(which can be turned on(when the audio signal is greater than 0db) or off) for overloaded sound from microphone, in order to avoid audio clipping, of course in future versions.
Thanks.