We cannot afford Ummy VD; your help please!

Greetings!

I am downloading Divine for very elders and basic and general information for children and young adolescents; free of charge. So, you may help me, by merging both Audio and Video of non-standard formats such as 480p, 1080p, 1440p etc. as I cannot afford Ummy Video Downloader and I cannot mux Audio and Video of non-english filenamed files.

Regards,

RS.