Click button in the upper right corner of the main window. Choose "Video" Tab:
Here you can resize the video by fitting its width or height, expand to video size or round to 16 pixels.
If you merge videos, please deselect these four options.
If you change the frame size, you can tick these options according to remove black bars.
Output Driver of Video Player
There are six options (Default, OpenGL, OpenGL 2, DirectX, DirectX:NoAccel, Direct3D) to choose output driver of video player you prefer.
Check Deinterlace option to enable deinterlace feature. Deinterlacing is the process of converting interlaced video, such as common analog television signals or 1080i format HDTV signals, into a non-interlaced form.
Flatten and add faststart to mp4 files -- Check Flatten and add faststart to MP4 files, you can produce MP4 files to upload to online video-sharing website, and the video will be played right away before the entire video has been downloaded from the website. For MP4 Faststart fixes the files so they can be streamed. It adjusts the MP4's metadata to allow for Flash players to play them right away (Fast Start), while it is downloaded from the website.
These are two accelerate measures to get faster and better converting experience.
NVIDIA NVENC/CUDA technology can encode full HD videos up to 8X faster than real time and leverage the power of the GPU to the maximum. OpenCL Hardware Acceleration make AMD APP work with CPU to complete video compression which can greatly reduce the compression time.
Please note that the option can be checked only if your computer video card supports.