demo.h264: 
 {
  "SPS": 516,
  "PPS": 516,
  "IDR": 516,
  "NDR": 21233
} 
normal.h264: 
 {
  "SPS": 1,
  "PPS": 1,
  "IDR": 8,
  "NDR": 465
} 
abnormal.h264: 
 {
  "NDR": 300,
  "SPS": 3,
  "PPS": 3,
  "IDR": 7
} 
abnormal2.h264: 
 {
  "NDR": 303,
  "SPS": 3,
  "PPS": 3,
  "IDR": 7
}