Filters static keyframes in Houdini

filterStaticKeys.py

import hou

if hou.selectedNodes():
    nd = hou.selectedNodes()[0]
else:
    nd = hou.node("/")

nodeArr = nd.allSubChildren()
for n in nodeArr:
    if not n.isInsideLockedHDA():
        parmArr = n.parms()
        for p in parmArr:
            if p.isTimeDependent():
                #print p
                deletelist = []
                keyframes = p.keyframes()
                if len(keyframes) > 1:
                    lastkey = None
                    blockstart = None
                    for key in keyframes:
                        if lastkey:
                            if key.value() == lastkey.value():
                                if blockstart is None:
                                    blockstart = True
                                    #print 'blockstart at', lastkey.frame()
                                if blockstart is not True:
                                    deletelist.append(lastkey.frame())
                            else:
                                blockstart = None
                                    
                            if blockstart is True:
                                lastkey.setExpression("linear()", hou.exprLanguage.Hscript)
                                p.setKeyframe(lastkey)
                                blockstart = False

                                
                        # first frame - ignore
                        lastkey = key
                for frame in deletelist:
                    p.deleteKeyframeAtFrame(frame)