When extracting images from a PPTX file, you can specify the output location for the images.

[readmagic]

I don't know why not support this feature. And I modify the local source code. Modify the file is _pptx_converter.py and in about 144 lines.

       # If keep_data_uris is True, use base64 encoding for images
                    if kwargs.get("keep_data_uris", False):
                        blob = shape.image.blob
                        content_type = shape.image.content_type or "image/png"
                        b64_string = base64.b64encode(blob).decode("utf-8")
                        md_content += f"\n![{alt_text}](data:{content_type};base64,{b64_string})\n"
                    else:
                        # A placeholder name
                        filename = re.sub(r"\W", "", shape.name) + ".jpg"
                        filepath = os.path.join(kwargs.get("img_dir", "."), filename)
                        with open(filepath, "wb") as f:
                            f.write(shape.image.blob)
                        md_content += f"\n![{alt_text}]({filepath})\n"

And this is my test case,this run ok.

from markitdown import MarkItDown

md = MarkItDown()
result = md.convert("/home/xxx/xxx.pptx,img_dir="/home/xxx/imgs/")
print(result.markdown)