PDFMinerParser Bug: Failed to Recognize Filter Type Error

[moyueheng]

Checked other resources

• I added a very descriptive title to this issue.
• I searched the LangChain documentation with the integrated search.
• I used the GitHub search to find a similar question and didn't find it.
• I am sure that this is a bug in LangChain rather than my code.
• The bug is not resolved by updating to the latest stable version of LangChain (or the specific integration package).

Example Code

example.pdf

pdf_miner_parser = PDFMinerParser(extract_images=True)
with open("examp.pdf") as f:
    blob = Blob(data=f.read())
    pdf_miner_parser.parse(blob)

Error Message and Stack Trace (if applicable)

File "agents/pdf2md/pdf2md_agent.py", line 30, in _process_file
documents = pdf_miner_parser.parse(blob)
File "/share_data/nfs_share/myh_dev/02-DP/md-is-all-you-need/.venv/lib/python3.10/site-packages/langchain_core/document_loaders/base.py", line 127, in parse
return list(self.lazy_parse(blob))
File "/share_data/nfs_share/myh_dev/02-DP/md-is-all-you-need/.venv/lib/python3.10/site-packages/langchain_community/document_loaders/parsers/pdf.py", line 215, in lazy_parse
content = text_io.getvalue() + self._extract_images_from_page(
File "/share_data/nfs_share/myh_dev/02-DP/md-is-all-you-need/.venv/lib/python3.10/site-packages/langchain_community/document_loaders/parsers/pdf.py", line 239, in _extract_images_from_page
if img.stream["Filter"].name in _PDF_FILTER_WITHOUT_LOSS:
AttributeError: 'list' object has no attribute 'name'

Description

I think I can fix this bug

System Info

python -m langchain_core.sys_info

System Information

OS: Linux
OS Version: #187-Ubuntu SMP Thu Nov 23 14:52:28 UTC 2023
Python Version: 3.10.14 (main, May 6 2024, 19:42:50) [GCC 11.2.0]

Package Information

langchain_core: 0.3.9
langchain: 0.3.2
langchain_community: 0.3.1
langsmith: 0.1.131
langchain_openai: 0.2.2
langchain_text_splitters: 0.3.0
langserve: 0.3.0

Optional packages not installed

langgraph

Other Dependencies

aiohttp: 3.10.9
async-timeout: 4.0.3
dataclasses-json: 0.6.7
fastapi: 0.115.0
httpx: 0.27.2
jsonpatch: 1.33
numpy: 1.26.4
openai: 1.51.0
orjson: 3.10.7
packaging: 24.1
pydantic: 2.9.2
pydantic-settings: 2.5.2
PyYAML: 6.0.2
requests: 2.32.3
requests-toolbelt: 1.0.0
SQLAlchemy: 2.0.35
sse-starlette: 1.8.2
tenacity: 8.5.0
tiktoken: 0.8.0
typing-extensions: 4.12.2

[dosubot]

Hi, @moyueheng. I'm Dosu, and I'm helping the LangChain team manage their backlog. I'm marking this issue as stale.

Issue Summary:

• The issue involves a bug in the PDFMinerParser component of LangChain.
• An AttributeError occurs due to incorrect access of a 'name' attribute on a list object.
• The error arises when the parser fails to identify the filter type during PDF processing.
• You have provided example code and a PDF file to demonstrate the issue.
• There have been no further comments or activity on this issue.

Next Steps:

• Please confirm if this issue is still relevant with the latest version of LangChain. If so, you can keep the discussion open by commenting here.
• If there is no response, the issue will be automatically closed in 7 days.

Thank you for your understanding and contribution!