ffmpeg nodejs lambda crop issue - node.js

Question

I have a lambda function to crop videos with ffmpeg
I am installing the layer this way
#!/bin/bash
mkdir -p layer
cd layer
rm -rf *
curl -O https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-amd64-static.tar.xz
tar -xf ffmpeg-git-amd64-static.tar.xz
mv ffmpeg-git-*-amd64-static ffmpeg
rm ffmpeg-git-amd64-static.tar.xz
I do not really which version but should be recent as I did it today for the last time
Then my node js lambda function is running with the following nodejs module https://github.com/fluent-ffmpeg/node-fluent-ffmpeg
return new Promise((resolve, reject) => {
ffmpeg(inputFile.name)
.videoFilters(`crop=${width}:${height}:${x}:${y}`)
.format('mp4')
.on('error', reject)
.on('end', () => resolve(fs.readFileSync(outputFile.name)))
.save(outputFile.name);
with for example videoFilters('crop=500:500:20:20')
And I have the folowing error
ffmpeg exited with code 1: Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0
Conversion failed!
On my local computer I am running the following command on the exact same image
ffmpeg -i in.mp4 -filter:v "crop=500:500:20:20" out.mp4
my version of ffmpeg is 4.2.2 and this is working great
I do not have the issue with all videos, here one video which is causing me the issue https://ajouve-util.s3.amazonaws.com/earth.mp4

Answer 1

Here is slightly modified code that works:
var ffmpeg = require('fluent-ffmpeg');
var reject = function(something) {
console.error("got error", something);
}
var resolve = function() {
console.info("Good, job done. Now read output file");
}
var width = 500;
var height = 500;
var x = 20;
var y = 20;
var filter_string = `crop=${width}:${height}:${x}:${y}`;
console.log("filter_string", filter_string);
var onStart = function(commandLine) {
console.log('Spawned Ffmpeg with command: ' + commandLine);
}
var command = ffmpeg('earth.mp4')
.videoFilters(filter_string)
.format('mp4')
.on('error', reject)
.on('end', resolve)
.on('start', onStart)
.output('earth_cropped.mp4');
console.log("running..");
command.run();
console.log("Done");
With earth.mp4 downloaded from your link in same dir output is:
node main.js
filter_string crop=500:500:20:20
running..
Done
Spawned Ffmpeg with command: ffmpeg -i earth.mp4 -y -filter:v crop=500:500:20:20 -f mp4 earth_cropped.mp4
Good, job done. Now read output file
And we get earth_cropped.mp4 file as expected.
I bet the error is in input params, so add .on('start', onStart) in your code and check logs to see exact command used to validate it ;)