Add multiple images to video fluent-ffmpeg - node.js

Question

I manage to add a single image to a video starting at a certain time and ending at a certain time, but I cannot find a way to do this for multiple images. I use fluent-ffmpeg.
This is the code I have:
ffmpeg('../videos/testklein.mp4')
.input('../src/test.png')
.input('../src/0.png')
.input('../src/1.png')
.addOptions([
"-strict -2"
])
.complexFilter([
{
filter: 'overlay',
options: {
x: 200,
y: 200,
enable: 'between(t,1,3)',
}}, {
filter: 'overlay',
options: {
x: 200,
y: 200,
enable: 'between(t,3,5)',
}},
{
filter: 'overlay',
options: {
x: 200,
y: 200,
enable: 'between(t,5,7)',
}
},
])
I suppose I need to explicitly state what filter should take what file, but I am not sure about the syntax for that.

Answer 1

This is the right syntax:
The first one add inputs [0:v][1:v] and outputs ['tmp']
Then add ['tmp'] as inputs for the next one. For 2 images:
I can add as many images as I want.
Pass the 'tmp' as 2nd argument to complexFilter!
(You can ofcourse change tmp to any string)
.complexFilter(
[
{
"filter": "overlay",
"options": {
"enable": "between(t,2,4)",
"x": "810",
"y": "465"
},
"inputs": "[0:v][1:v]",
"outputs": "tmp"
},
{
"filter": "overlay",
"options": {
"enable": "between(t,13,14)",
"x": "810",
"y": "465"
},
"inputs": "[tmp][2:v]",
"outputs": "tmp"
}
], 'tmp')

Answer 2

i was searching for adding multiple images in a simple complexFilter then i found this code working but after rendering the video the sound was being removed. After making a lot of changes I found a solution for audio.
add an outputOption in your code
.outputOptions(["-map 0:a"])
Sharing this if anyone is having the audio problem.