ALF encoders conflicts between layers. The ALF encoder can erase an APS of another layer. This results in APS (that could have been reused) being "stolen" by other layers. This possibly reduces ALF performances.

wrong sps and pps IDs are used in multi-layer encoding (scalable) in xWriteOutput() function. size condition erroneously turns on "RPR" case and uses arbitrary sps and pps ids to retrieve conformance window

The vtm decoder software 18.0 (commit 3711eda2cff4777b28b3338d6bc4783424fc6d30) contains memory leaks. You can reproduce the problem by decoding a stream with asan.

==5050==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 20544 byte(s) in 4 object(s) allocated from:
    #0 0x55bb2ab2ef8d in operator new(unsigned long) 
    #1 0x55bb2af738b2 in Picture::finalInit(VPS const*, SPS const&, PPS const&, PicHeader*, APS**, APS*, APS*) source/Lib/CommonLib/Picture.cpp:272:19
    #2 0x55bb2abb36d1 in DecLib::xActivateParameterSets(InputNALUnit) source/Lib/DecoderLib/DecLib.cpp:1993:14
    #3 0x55bb2abd2878 in DecLib::xDecodeSlice(InputNALUnit&, int&, int) source/Lib/DecoderLib/DecLib.cpp:3033:3
    #4 0x55bb2ab9199b in DecLib::decode(InputNALUnit&, int&, int&, int) source/Lib/DecoderLib/DecLib.cpp:3704:41
    #5 0x55bb2ab38f06 in DecApp::decode() source/App/DecoderApp/DecApp.cpp:281:21
    #6 0x55bb2ab31e60 in main source/App/DecoderApp/decmain.cpp:93:24
    #7 0x7f3936345d09 in __libc_start_main csu/../csu/libc-start.c:308:16