This problem has been reported here before. The original reporter didn't sent the requested log-files as far as I know. More people reported this same problem over here (Dutch).
Attached to this ticket is one minute of logging of both oscam and Tvheadend. If this is not enough to pinpoint the problem, please let me know.
The same oscam instance is being used by sasc-ng without problems.
TV Vlaanderen (Belgium) and Canaal Digitaal (Netherlands) are the same provider. Encryption is seca.
The "unexpected ECM reply" is indeed gone and things have improved, but it is still not working okay. The signal is being decoded, giving a new still image about every second. I believe this is caused by incorrect ECM messages.
0100&00006A is the correct message, I believe the others are wrong (for example 0000&000100) and are being rejected by oscam correctly.
tvheadend log
[DEBUG]:cwc: Sending ECM section=0/0, for service NED1 (seqno: 2) PID 1603
[DEBUG]:cwc: Sending ECM section=0/0, for service NED1 (seqno: 3) PID 1803
[DEBUG]:cwc: Sending ECM section=0/0, for service NED1 (seqno: 4) PID 1823
[DEBUG]:cwc: Sending ECM section=0/0, for service NED1 (seqno: 5) PID 1843
[DEBUG]:cwc: Sending ECM section=0/0, for service NED1 (seqno: 6) PID 1903
[DEBUG]:cwc: Received NOK for service "NED1" (seqno: 3 Req delay: 41 ms)
[DEBUG]:cwc: Received NOK for service "NED1" (seqno: 4 Req delay: 45 ms)
[DEBUG]:cwc: Received NOK for service "NED1" (seqno: 5 Req delay: 49 ms)
[DEBUG]:cwc: Received NOK for service "NED1" (seqno: 6 Req delay: 53 ms)
[DEBUG]:cwc: Received ECM reply for service "NED1" even: ??.??.??.??.??.??.??.?? odd: ??.??.??.??.??.??.??.?? (seqno: 2 Req delay: 382 ms)
[INFO]:cwc: Obtained key for for service "NED1" in 382 ms, from 127.0.0.1
Not really, I don't really know what's wrong here. Descrambling is a bit tricky and it's not like there are a lot of documentation on the subject either :(