Error Sequence contains no elements on image plotting about yolov8 HOT 3 CLOSED

You were right! it was because there were no fonts available in the container.

So i tried your solution by adding default font to my project and load it like this:
using var ploted = await result.PlotImageAsync(image, new() { FontFamily = new FontCollection().Add(fontPath) });

However, upon initialization, the PlottingOptions constructor will always invokes GetDefaultFontFamily(), which is the main problem since there are no system fonts in the first place.

public PlottingOptions()
{
    FontFamily = GetDefaultFontFamily();
    FontSize = 12f;
} 

So currently my solution is by installing ttf-mscorefonts-installer for default SystemFonts on my Docker container. However, this solution is suboptimal as it could potentially degrade server performance.

RUN echo "deb http://deb.debian.org/debian/ bookworm main contrib" > /etc/apt/sources.list && \
    echo "deb-src http://deb.debian.org/debian/ bookworm main contrib" >> /etc/apt/sources.list && \
    echo "deb http://security.debian.org/ bookworm-security main contrib" >> /etc/apt/sources.list && \
    echo "deb-src http://security.debian.org/ bookworm-security main contrib" >> /etc/apt/sources.list
RUN sed -i'.bak' 's/$/ contrib/' /etc/apt/sources.list
RUN apt-get update; apt-get install -y ttf-mscorefonts-installer fontconfig

Well I think by using FirstOrDefault() in GetDefaultFontFamily() is better than First() since it wont throw Sequence contains no elements and FontFamily can be reassigned if there are no fonts available.

from yolov8.

I'll fix it soon, thanks for reporting it.

from yolov8.

from yolov8.