Description
What did you do?
I encoded a list of image into MPO and decoded them. Decoding failed to return multiple images.
What did you expect to happen?
The MPO plugin should be able to decode the MPO encoded by its own.
What actually happened?
Decoder complains that the file is truncated.
What are your OS, Python and Pillow versions?
- OS: Linux
- Python: 3.10.12
- Pillow: 11.2.1 (I also tried 9.5.0, 10.4.0. Same error)
import io
import PIL.Image
frames = [PIL.Image.new("RGB", (512, 512), c) for c in ["red", "green", "blue"]]
with io.BytesIO() as f:
frames[0].save(
f, format="MPO", save_all=True, append_images=frames[1:]
)
mpo_bytes = f.getvalue()
with io.BytesIO(mpo_bytes) as f:
mpo_image = PIL.Image.open(f)
print(mpo_image.n_frames)Logs:
> /usr/local/lib/python3.10/dist-packages/PIL/TiffImagePlugin.py:950: UserWarning: Truncated File Read
> warnings.warn(str(msg))
> /usr/local/lib/python3.10/dist-packages/PIL/JpegImagePlugin.py:890: UserWarning: Image appears to be a malformed MPO file, it will be interpreted as a base JPEG file
> warnings.warn(
>
> [/usr/local/lib/python3.10/dist-packages/PIL/JpegImagePlugin.py](https://localhost:8080/#) in __getattr__(self, name)
> 398 deprecate(name, 12)
> 399 return getattr(self, "_" + name)
> --> 400 raise AttributeError(name)
> 401
> 402 def __getstate__(self) -> list[Any]:
>
> AttributeError: n_framesThe same works for GIF, but fails for MPO.