I recently created a 5 seconds video using Synfig. It was a fantastic experience seeing my animation, making my cat singing a song. Synfig is a great opensource animation software that you can use to create animation very easily. I created the svg file using Inkcape and it’s a matter of importing the svg file to the synfig to apply various animation effects to the character. The beauty of this software is that you can separately animate each element like hands, head, body or lips on a timeline.
Earlier there was no option to convert the output to a movie. The only option was to generate a series of png files and using ffmpeg command-line option to assemble them together. Now it is a hazel free experience converting your animation to a real movie.
The youtube video is located here