In addition to other noting that decoders and encoders almost all have an enormous amount of hand optimized code because they are literally the most demanding a

In addition to other noting that decoders and encoders almost all have an enormous amount of hand optimized code because they are literally the most demanding applications most people run (which is why most codecs today are hardware accelerated and they are used in almost all CPU benchmarks) 186k LOC (given that it's assembler which is nearly always "vertical code") is also relatively small for decoders. People don't really get how complex video codecs are.