Video Combiner is a small, and free, Windows application that lets you combine multiple video files in one single file. The application is developed by MP3 Toolkit.
The software lets you easily combine multiple video formats (for example, you can add a WMV and MP4 to the list), set the bitrate, and use CPU acceleration. You can also set the output video resolution to match any of the input videos. For example, you can set the video output to match the width or height of the largest or smallest video. Also, when combining videos of different aspect ratios, you can check the “Scale Videos” checkbox to make the videos fit the entire screen, getting rid of any potential black bars (like the black bars you get when you play widescreen video on a square screen).
Video Combiner supports various video formats, like WMV, MP4, MOV. It even supports WEBM, and can also export to different video formats like MP4, MKV, FLV, or VOB. To combine videos, you simply add them to the list inside the software interface. As you can guess, they are combined in the order you put them (the first video being the one at the top). If you want a different order, the interface has two big green arrows that let you reorganize all the videos.
If you are using a 64 bit system, you can take advantage of the CPU acceleration. After trying both methods, I noticed using CPU acceleration cuts the encoding time between one third or even half, which is a very nice thing.
If you are one of those people who like to work on more than one thing at once, there's one thing to keep in mind. When encoding videos, Video Combiner will pretty much use 100% of your CPU (this may also make your computer run slow). Even if the application uses all your CPU to process the videos, it won't use a lot of RAM. During my tests (joining videos that are between one and ten minutes long), the program was using less than 50Mb of RAM.
Another thing to keep in mind is joining videos of multiple sizes. If you are trying to join a 640x480 px video and a full HD video (1920x1080 px), the smaller video will not magically improve its quality. You will get a larger video, but any blurriness and compression artifacts present in the original video will still be there. In other words, the resulting video will be pretty much the same as turning on “full screen” on the Windows Media Player when playing a 640x480 px video on a full HD screen. On the other hand, Video Combiner retains the original video bit rates, and that the resulting video is indistinguishable from the source video, so that is a big plus.
Video Combiner is an application that you may find useful if you need to combine videos quickly and easily. You can get an installable version and also a portable version that you just unzip and run.
Get Video Combiner: https://www.mp3toolkit.com/videocombiner.html