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"Internal error occured" on Transcoding API

Hey all - I'm in the dark here a bit. I'm trying to setup an automatic transcoder to turn uploaded videos on my site into mp4 containers. I've followed the tutorial here:  https://cloud.google.com/transcoder/docs/how-to/jobs#create_jobs_ad_hoc and also tried using the template preset/hd-web as well as my own template. I've checked permissions to ensure Transcoder Admin is applied, then pointed it at a small .mov file uploaded in GCS. 

The job starts (listing jobs I can see it RUNNING), then several minutes later it goes to error: { details: [], code: 13, message: 'Internal error occurred.' }. Doesn't matter what file, what template etc, the result is the same. 

Any pointers would be really useful! 

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The size of the metadata associated with the file in your Google Cloud Storage Bucket can cause the Transcoder API to fail with 'Internal Error' if it's too large. For example, storing long base64 strings in the file metadata will result in unsuccessful transcoding jobs.