How to pass arguments to blend filter FFMPEG

Question

I am trying to merge 5 images and create a blinking video after combining them.I have successfully applied fade-in fade-out effect for them. FFMPEG is still fairly new to me.

Here is the command I have executed:

"-loop 1 -i "+path+"images_001.jpg " +
"-loop 1 -i "+path+"images_002.jpg " +
"-loop 1 -i "+path+"images_003.jpg " +
"-loop 1 -i "+path+"images_004.jpg " +
"-loop 1 -i "+path+"images_005.jpg " +
"-filter_complex " +
"[1:v][0:v]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b1v];" +
"[2:v][1:v]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b2v];" +
"[3:v][2:v]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b3v];" +
"[4:v][3:v]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b4v];" +
"[0:v][b1v][1:v][b2v][2:v][b3v][3:v][b4v][4:v]concat=n=9:v=1:a=0,format=yuv420p[v] -map [v] "+path+"out.mp4"

on Executing this command the process keeps running forever. There is my screenshot of that thing :

I know I am missing something silly; As i am new in ffmpeg it would be great if I could get some knowledge of where I am going wrong here. What am I missing?

Answer 1

After each -loop 1, insert -t x where x is duration in seconds.

Answer 2

Your expression for blend doesn't make sense to me. What you want to do? Blend does something like this for each pixel: pixel component = function(pixel component of A input, pixel component of B input). So what your function should do? It could do (A + B) / 2 which is very simple case....