jpegdec: By default assume that we're working on non-packetized input
jpegdec: By default assume that we're working on non-packetized input

Only detecting this in set_format() does not work because we might
not get any caps at all, e.g. from filesrc.

Distrotech/gst-plugins-good,Distrotech/gst-plugins-good,Distrotech/gst-plugins-good,Distrotech/gst-plugins-good,Distrotech/gst-plugins-good