Blank screen after postRender

Shotstack API
1

Howdy,

I am uploading my first video to the sandbox. But every time I do I get a video that is black/blank. It is the right length and all the stats looks ok. Just no video. Here is the json:

{
  "edit": {
    "timeline": {
      "tracks": [
        {
          "clips": [
            {
              "asset": {
                "type": "luma",
                "src": "https://s3/xxxxx/T8RrU.mov"
              },
              "start": 0,
              "length": 6.031667
            },
            {
              "asset": {
                "type": "luma",
                "src": "https://s3/xxxxx/LCtaL.mov"
              },
              "start": 6.031667,
              "length": 6.365
            },
            {
              "asset": {
                "type": "luma",
                "src": "https://s3/xxxxx/BX64O.mov"
              },
              "start": 12.396667,
              "length": 6
            },
            {
              "asset": {
                "type": "luma",
                "src": "https://s3/xxxxx/z4a71.mov"
              },
              "start": 18.396667,
              "length": 6.033333
            },
            {
              "asset": {
                "type": "luma",
                "src": "https://s3/xxxxx/LCMII.mov"
              },
              "start": 24.43,
              "length": 6.031667
            },
            {
              "asset": {
                "type": "luma",
                "src": "https://s3/xxxxx/SzAFE.mov"
              },
              "start": 30.461667,
              "length": 6
            }
          ]
        }
      ]
    },
    "output": {
      "format": "mp4",
      "size": {
        "width": 1920,
        "height": 1080
      },
      "fps": 30
    }
  }
}

I have tested all of the video clips and they are public, 30fps, mov format, and landscape.

screenshot of stats

Screenshot 2023-04-11 at 1.56.32 PM
Screenshot 2023-04-11 at 1.56.32 PM1159×501 36.8 KB

Thanks for your help,

D

2

Looking at your JSON, every clip asset type is a luma. Luma’s create a transparency effect when used with video and images, but by themselves they will have no effect - most likely they just render as transparent and that is why you have a blank video. If you are trying to create a luma transparency effect we have a tutorial here: Create a luma matte transition using After Effects — Shotstack

If you are just trying to stitch video together then just change the asset type from luma to video. Here is a tutorial on merging/stitching videos: Merge videos using the editing API — Shotstack

3

Yep. That did it. I was using Asset and not VideoAsset.

Thanks!

4

OK, interesting, Asset must just default to luma, you need to make sure you use the specific asset type.