The image files appear to be empty (all null bytes) — the download from object storage likely failed before this transcription job was invoked. The files at the temp path contain no valid image data. The transcription script will need to re-fetch or re-download the images before they can be read. If you're running `_transcription/transcribe.py` directly, check that the image download step succeeded and the files are non-zero before the script calls me.