Download the latest version of VirtualDub from the official website. Unpack the portable software to your hard drive after download, and run the VirtualDub.exe afterwards.

You load the first movie with a click on File > Open Video File. Click on File again and select Append Avi Segment for each additional part that you have as a file on your hard drive. You can only load one movie at a time, which makes the process somewhat unhandy if you have many different parts.

Switch to the Video menu and make sure Full Processing Mode is selected there. Click on Compression under Video afterwards, and select one of the available video codecs. Please note that you need suitable codecs installed on your system for a solid result that offers a good image quality and suitable file size.

You can furthermore add filters to the process, for instance if you would like to resize the video, change the brightness and contrast or add a logo to one of the corners. You can preview the changes by pressing enter or by selecting File > Preview Filtered.

Once you have made your selection select File > Save as Avi and pick a directory on the local hard drive to save the video to.

VirtualDub will display a status window where you can get information about the current processing status, as well as an estimation of the file size of the new video file. You can jack up the process priority if your computer is idle otherwise.

And that’s it. Just wait for the process to finish. It is recommended to play the video once on your hard drive to make sure that the merging was successful and without errors like out of sync audio.

The following method makes it possible to join multiple video files into one big file making it that much easier in the end to play and enjoy the downloaded movie. The method is different depending on the type of movie that you are playing. If the movie consists of multiple mpg movies you can use the windows command line to merge them.

Start the command line by pressing the windows key and R. Enter cmd in the prompt which will start the command line window. Enter the following line into the command line, make sure you enter the right filepath to the movie. I suggest you move the files to the top of a hard drive to ease the amount of typing that needs to be done.

copy /B “C:\movie1.mpg” + “C:\movie2.mpg” + “C:\movie3.mpg” “C:\completemovie.mpg”

This joins movie1.mpg, movie2.mpg and movie3.mpg into completemovie.mpg. You can add more movies to join more parts without problems.

You need an additional programs if the parts are avi files instead of mpg. Download the freeware VirtualDubMod and unpack it to your hard drive. Run the tool and select File, Open Video File and browse to the first part of the movie. Select no If a popup named VBR audio stream detected appears.

Click on File, append Segment and browse to the second part of the movie. Once this is done click on File, Save As and save the newly merged movie file to your hard drive.