import json,sys
def load(p):
    d=json.load(open(p)); out=[]
    for ev in d.get('events',[]):
        if 'segs' not in ev: continue
        t=''.join(s.get('utf8','') for s in ev['segs']).strip()
        if t and t!='\n': out.append((ev['tStartMs']/1000,t.replace('\n',' ')))
    return out
if __name__=='__main__':
    for t,x in load(sys.argv[1]): print(f"{int(t//3600):d}:{int(t%3600//60):02d}:{int(t%60):02d} {x}")