ATH-MaaS/Pixelle-Video · error · Exception

No image generated

Error message

No image generated

What it means

For media_type 'image', MediaService.__call__ requires at least one entry in result.images after a 'completed' workflow run. If the finished run produced no image outputs, it raises 'No image generated'. Like the video variant, this indicates an output-mapping or workflow-configuration problem rather than a failed execution.

Source

Thrown at pixelle_video/services/media.py:306

                
                video_url = result.videos[0]
                logger.info(f"✅ Generated video: {video_url}")
                
                # Try to extract duration from result (if available)
                duration = None
                if hasattr(result, 'duration') and result.duration:
                    duration = result.duration
                
                return MediaResult(
                    media_type="video",
                    url=video_url,
                    duration=duration
                )
            else:  # image
                # Image workflow - get image from result
                if not result.images:
                    logger.error("No image generated (workflow returned no images)")
                    raise Exception("No image generated")
                
                image_url = result.images[0]
                logger.info(f"✅ Generated image: {image_url}")
                
                return MediaResult(
                    media_type="image",
                    url=image_url
                )
        
        except Exception as e:
            logger.error(f"Media generation error: {e}")
            raise

View on GitHub (pinned to 848b054e4f)

Solutions

  1. Verify the workflow JSON contains an enabled SaveImage (or equivalent) node whose outputs are returned by the backend.
  2. Confirm the workflow_id/file is an image workflow and matches the media_type='image' call.
  3. Inspect the raw result (logs of result.__dict__ / result.outputs) to find where the image landed; if stored under files, extract it there or upgrade ComfyKit.
  4. For RunningHub, ensure the output node is published/exposed so the API returns generated image files.
  5. Retry once if the backend sometimes omits outputs under load, but treat a persistent empty result as a workflow configuration bug.

Example fix

// before
if not result.images:
    raise Exception("No image generated")
// after
images = getattr(result, "images", None) or [f for f in getattr(result, "files", []) or [] if f.endswith((".png", ".jpg", ".jpeg", ".webp"))]
if not images:
    raise Exception(f"No image generated; outputs={getattr(result, 'outputs', None)}")
image_url = images[0]
Defensive patterns

Strategy: validation

Validate before calling

# pre-flight: ensure the workflow actually produces image output
def workflow_produces_image(workflow_json: dict) -> bool:
    nodes = workflow_json.get("nodes", [])
    return any(n.get("type") in ("SaveImage", "SaveImageWithAlpha", "PreviewImage")
               for n in nodes if not n.get("mode"))
assert media_type == "image" and workflow_produces_image(load_workflow(workflow_key))

Type guard

def has_image_output(result) -> bool:
    return bool(getattr(result, "images", None))

Try / catch

try:
    media = await media_service(...)
except Exception as e:
    if "No image generated" in str(e):
        logger.error("workflow completed with no image; check SaveImage node")
        raise WorkflowConfigError("image workflow has no active SaveImage node") from e
    raise

Prevention

When it happens

Trigger: kit.execute() returns status 'completed' but result.images is empty/None for media_type='image' — usually the workflow lacks a SaveImage/PreviewImage node, the save node is bypassed, or ComfyKit did not classify outputs as images.

Common situations: Pointing the image pipeline at a video workflow; SaveImage node disabled or 'save_output' toggled off; RunningHub workflow without an exposed image output node; ComfyKit version whose result schema puts images under files instead of images.

Related errors

AI-assisted analysis of ATH-MaaS/Pixelle-Video@848b054e4f (2026-08-30). Data as JSON: /api/errors/ec5a189421a554ab. Report an issue: GitHub.