Hello, I have over 4+ years of experience in ffmpeg. I have written media players based of ffmpeg for Set-top Boxes, I have done various tasks using ffmpeg like trans-coding audio/video to different codecs, creating a slideshow of images, creating videos from images, capturing Desktop and streaming it to a streaming device, Merging audio in existing videos etc. I will give you fully working commands for all your needs. Please ping me if you are interested.