[Bug] Issues with media.py dict handling & Gemini Image Payload structure

[humaningansalam]

Before submitting
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Configuration

• Model: gemini-2.5-flash
• Provider: Gemini
• Interface: API (Docker / n8n)

Bug description
I encountered two issues when using the API with standard OpenAI-compatible image payloads (e.g., from n8n).

1. g4f/tools/media.py Crash
When the API receives image_url as a dictionary {"url": "..."}, media.py crashes with AttributeError. It currently seems to expect a string.

2. Gemini Provider Image Attachment
Even after fixing media.py, Gemini uploads the image successfully but responds with "I cannot see the image."
It seems the f.req payload structure in Gemini.py is outdated compared to the current browser behavior.

Logs

File "/app/g4f/tools/media.py", line 69, in merge_media
    path: str = urlparse(part.get("image_url")).path
AttributeError: 'dict' object has no attribute 'decode'

Observations & Local Fixes
I managed to get it working locally with the following changes. I hope this helps in updating the codebase.

For media.py:
I modified merge_media to check if part.get("image_url") is a dict and extract the "url" value.

For Gemini.py (build_request):
I inspected the browser traffic and noticed the payload structure for images has changed.
Updating the structure to the following format solved the issue for me:

# Current implementation in g4f:
# image_list = [[[image_url, 1], image_name]]

# What worked for me (Browser structure):
image_list.append([
    [
        image_url,
        1,
        None,
        "image/jpeg"  # Note: MIME type seems required now (needs to be dynamic)
    ],
    image_name,
    None, None, None, None, None, None, # 7 nulls
    [0] # [0] suffix
])

After applying this structure, Gemini correctly recognized the uploaded image.

[hlohaus]

@humaningansalam To utilize Gemini, it is necessary to provide a local file.

media = [open(path, "rb"), filename]

[github-actions]

Bumping this issue because it has been open for 7 days with no activity. Closing automatically in 7 days unless it becomes active again.