Click the the Add files... button to select an input video file(s) from your computer.
Input file formats: *.avi; *.ivf; *.div; *.divx; *.mpg; *.mpeg; *.mpe; *.mp4; *.m4v; *.webm; *.wmv; *.asf; *.mov; *.qt; *.mts; *.m2t; *.m2ts; *.mod; *.tod; *.vro; *.dat; *.3gp2; *.3gpp; *.3gp; *.3g2; *.dvr-ms; *.flv; *.f4v; *.amv; *.rm; *.rmm; *.rv; *.rmvb; *.ogv; *.mkv; *.ts.
By default the output file name is the same as video title is. If you want to change it click the Output Name... button. A new window will be opened.
There are some parameters in it (Name Prefix, Postfix and others) which you can set as you like.
In the bottom of this window you can see the pattern of the output file name. It's formed according to the current options.
the pattern is the same for all output files during one session, it's not allowed to set the unique pattern for each file.