Hello Guys,

I'm new to video conversion eng, just looking for a way to add a video layer on myFFmpeg.
I know how to do it with a script file directly on ffmpeg and FFAStrans, but i just found out myffmpeg and since it's not only me who's gonna use it, i need this process as simple as it can be and FFAStrans still has some flaws (like no subtitle hard burn option).

Can you tell me how can i add a video layer with alpha channel on myFFmpeg?

Code:
-filter_complex "[0:v]scale=1920:1080:sws_flags=spline+accurate_rnd+full_chroma_int+full_chroma_inp:interl=-1:out_range=full,pad=1920:1080:990:224[a0];movie=filename=FTV_BUG_GENERIC.mov:loop=0, setpts=N/(25*TB),premultiply=inplace=1[b0];[a0][b0]overlay=0:0:alpha=premultiplied,scale=1920:-2,format=pix_fmts=yuv444p"
Thanks