mumu version :
mumudvb.conf -vvvvvvvv
MuMuDVB Version 2.1.0_20181020_mumudvb2
--- Build information ---
Built with CAM support.
Built with SCAM support.
Built with ATSC support.
Built with ATSC long channel names support.
Built with support for DVB API Version 5.10.
Built with support for DVB-T2.

Well i use softcam.key as well on my receivers and this happens when the key is not correct or it is an old key. It will say descrambled but you will keep black screen.

the key is correct. the key work in dvbdream + powervu emu
mumudvb log :
Info: Main: Channel "channel xD HD" is now fully unscrambled (0% of scrambled packets). Card 0

but not video in vlc only black screeen and only audio without decrypted :(

more log mumudvb :
Deb1: Main: TV x Latin HD: packets in ring buffer 5741, ring buffer size 32768, to descramble 1534, to send 4207
Deb1: SCAM_GETCW: Got CA_SET_DESCR request for channel: TV x Latin HD, index: 0, parity 1, key XX XX XX XX XX XX XX XX
Deb1: SCAM_GETCW: Got CA_SET_DESCR request for channel: TV x Latin HD, index: 1, parity 1, key XX XX XX XX XX XX XX XX
Deb1: SCAM_GETCW: Got CA_SET_DESCR request for channel: TV x Latin HD, index: 2, parity 1, key XX XX XX XX XX XX XX XX
Deb1: SCAM_GETCW: Got CA_SET_DESCR request for channel: TV x Latin HD, index: 3, parity 1, key XX XX XX XX XX XX XX XX
Deb1: SCAM_GETCW: Got CA_SET_DESCR request for channel: TV x Latin HD, index: 4, parity 1, key XX XX XX XX XX XX XX XX
Deb1: SCAM_DECSA: 000000018a7016d2 odd key xx xx xx xx xx xx xx xx, channel TV x Latin HD
Deb1: Main: TV x Latin HD: packets in ring buffer 5003, ring buffer size 32768, to descramble 1785, to send 3218

Hi, Same issue here. Have you solved it ?

我这边遇到的一样的问题，有声音无视频的。非powervu的正常

你们解决这个问题了吗？

no.
numudvb not discramble image pv
i listen audio because is not encrypted