I am developing an app which requires some animated files. I am developing the animations in Adobe Flash Professional CC. However, the output .swf format is not supported in android now a days. Hence, I need to convert the files to a video format, .mp4 preferably. The animation will also contain a sound. The problem I am facing is that, no matter what tools I am using, the converted file does not import the audio. One exception was the Xilisoft converter, which however, extended the length of the video and thus, the audio and video does not synchronize.
Can anyone kindly provide me with an optimal procedure of conversion?