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| # Template final-output validation | |
| Template runs validate the final artifact before publishing it to the media download layer. | |
| ## Checks | |
| - The final artifact exists and has a non-zero file size. | |
| - The artifact's extension matches the template's declared output format (except `source`, which preserves the input format). | |
| - Probeable media is passed through the existing FFprobe validation path. The probe rejects outputs without decodable audio/video streams. | |
| - When stream metadata is available, the final check confirms that audio and video MIME types have their corresponding stream and that reported audio/video duration is positive. | |
| A failed check raises a template execution error, so the output is not published as a successful result. | |
| ## Response metadata | |
| Successful template responses include an `output_validation` object in `metadata`, for example: | |
| ```json | |
| { | |
| "output_validation": { | |
| "valid": true, | |
| "size_bytes": 4821093, | |
| "mime_type": "video/mp4", | |
| "container": "mov,mp4,m4a,3gp,3g2,mj2", | |
| "duration_seconds": 31.25, | |
| "video_stream_count": 1, | |
| "audio_stream_count": 1, | |
| "resolution": { | |
| "width": 1080, | |
| "height": 1920 | |
| } | |
| } | |
| } | |
| ``` | |
| Stream counts, container, duration, and resolution can be `null` when the output type is not probeable or a metadata field is unavailable. The file size and MIME type are always reported for a valid file artifact. | |
| This validation is applied to template pipeline outputs; it does not imply that every standalone media endpoint has the same response metadata. | |