"adobe" in app14 marker seem not a null-terminted string. so, when we use gst_byte_reader_get_string_utf8, more bytes will be read until null. and "gst_byte_reader_get_uint8 (&reader, &transform)" will almost fail to read transform Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7356>