TypeError in ffmpeg_reader.py: Metadata concatenation fails when field value is a float

[melyux]

Expected Behavior

MoviePy should correctly parse and concatenate metadata fields from ffmpeg output by converting all values to strings when necessary. Even if a metadata value is numeric, it should be handled gracefully without throwing an error.

Changing this line in ffmpeg_reader.py from this:

value = self._current_stream["metadata"][field] + "\n" + value

to this:

value = str(self._current_stream["metadata"][field]) + "\n" + value

seems to solve the issue.

Actual Behavior

When parsing metadata from a video file, MoviePy raises a TypeError because it attempts to concatenate a float (e.g., 3.088510 from com.apple.quicktime.location.accuracy.horizontal) with a string. The error message is:

TypeError: unsupported operand type(s) for +: 'float' and 'str'

Steps and code to Reproduce the Problem

1. Use a video file (for example, a .mov file) that includes metadata fields with numeric values.
2. Run the following code:

from moviepy.editor import VideoFileClip

path = "/path/to/your/video/IMG_2056.mov"
video = VideoFileClip(path)

3. The script will fail during metadata parsing with the above TypeError.

Used medias

I'd rather not put it here, can send privately

Specifications

• Python Version: 3.11
• MoviePy Version: latest master (as of 3/8/25)
• Platform Name: macOS
• Platform Version: latest