Code review comment for lp:~michihenning/thumbnailer/add-preview-image-extraction

I think I've discovered the image type handling bug. Since you're modifying the code in question, I'll just note it here rather than creating a conflicting MP.

The following code:

        auto caps = gst_sample_get_caps(sample);
        auto structure = gst_caps_get_structure(caps, 0);

Needs to be changed to:

        auto structure = gst_sample_get_info(sample);

It seems the sample code I based this on was doing it wrong.