This works with one of 2 RLCP samples i have, the other appears to also use selective arithemtic coding bypass which may or may not be the reason why it does not work
Sample: p0_16.j2k
9c89392 avcodec/jpeg2000dec: Implement progression order RLCP
libavcodec/jpeg2000dec.c | 25 ++++++++++++++++++++++++-
1 file changed, 24 insertions(+), 1 deletion(-)