[Bug]: Webcam example does not work properly with FFmpeg 6 about dlib HOT 6 CLOSED

Yes, it works, thank you!

from dlib.

If you had compiled your example with DLIB_ASSERT statements enabled it would have thrown "frame doesn't have correct format". This is a good example of why we should discourage users to use ffmpeg::frame instances directly, and instead use dlib image container types. The documentation should be clear on how to use them and convert to and from dlib objects. However, you can still make mistakes. If you use the API to read directly into matrix<rgb_pixel> objects for example (or array2d<bgr_pixel> or whatever) then it should always do the right thing. I have use-cases for using ffmpeg::frame directly as i need to use the untampered YUV frames coming straight out the codec. But those use-cases are rare.

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Yep will check when I get to work

from dlib.

Yep. It's not a bug with the implementation details or ffmpeg version, it's the example. When reading "ffmpeg::frame" instances, we're not asking it to convert pixel format to RGB. They are coming out as YUV. The easiest thing is to use the simpler API and read directly into array2d<rgb_pixel>. I'll submit PR.

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I have a PR. Let me know if that fixes it on your end. Cheers

from dlib.

We can also use DLIB_CASSERT which is always activated for key functions. Like where we think it doesn't have a meaningful performance impact in any use case and would catch what's likely to be a common user error.

from dlib.