Portable Ultimate Video Converter

Ultimate Video Converter is an application that can encode media files between various formats, including MKV, AVI, FLV, ASF and 3GP.
Since this is an ad-supported software, installing Ultimate Video Converter is not necessary. You can simply place it on an external device and run the executable file on any computer. Plus, your Windows registry entries will remain unchanged.
The interface of the tool consists of a simple wizard in which you have to follow a few steps to get a successful conversion.
So, you can get started by importing media to the list by using the file browser (the "drag and drop" method is not supported but batch processing is).
Now you can set the output directory, as well as configure conversion options (e.g. easy or HD mode, profile, container, file extensions), video settings (video codec, size, frame rate, bitrate) and audio preferences (audio codec, bitrate, channels, sample frequency rate).
Furthermore, you can set Ultimate Video Converter to overwrite all files or to go to quite mode (i.e. doesn't display any messages) if media with the same file name already exists. During a conversion task, you can view the individual and total progress, as well as elapsed and remaining time.
The program uses a low-to-moderate amount of system resources and quickly finishes a task while keeping a good image and sound quality.
However, there is no help file available and Ultimate Video Converter was unable to encode some files due to unspecified errors. Also, it crashed once during the first step of the wizard. The bottom line is that you have test Ultimate Video Converter for yourself.