Interlaced MJPEG is a big hack. Most of the streams we've found are from old AVID tools. There are two methods to detect interlaced stream: the container offers a height bigger (or double) than the image's height in SOF. The other is from a APP0 marker. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5838>