Concatenating in wrong order

Transloadit
1

Hi there,

I’m using the template below to concatenate two audiofiles. However sometimes it happens in the wrong order. It doesn’t seem to make any difference in which order i feed them, the smaller file is always appended to the larger. Any help much appreciated!

{
“steps”: {
“import”: {
“robot”: “/http/import”,
“url”: “{fields.import_url}" }, "preroll_imported": { "robot": "/http/import", "url": "{fields.preroll_url}”
},
“concat”: {
“use”: {
“steps”: [
{
“name”: “preroll_imported”
},
{
“name”: “import”
}
],
“bundle_steps”: true
},
“robot”: “/audio/concat”,
“ffmpeg_stack”: “v3.3.3”
},
“export”: {
“use”: [
“concat”
],
“robot”: “/s3/store”,
“credentials”: “S3_test”
}
}

}

2

Hi Jesper, welcome to our forum! We process as much as we can in parallel, so without specifying what goes first, you may as well flip a coin to determine what will happen next :slight_smile:

To specify what goes first, you can use the use as video_1 syntax. You’ll find an example as part of this demo: https://transloadit.com/demos/video-encoding/concatenate-fade-effect/ in the fifth step.

Let me know if this let’s you get going! Here to assist more if not :ok_hand:

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