Algorithm 2: Detection algorithm based on video texture changes fraction

$\mathrm{Input}: \mathrm{video} \mathrm{frames} I^{\left(p\right)}(1\le p\le N)$$, \mathrm{set} THR\_R1$as threshold selected for peak point

$\mathrm{Output}: \mathrm{store} \mathrm{position} \mathrm{of} \mathrm{suspicious} \mathrm{tampering} \mathrm{point} \mathrm{in} S$

$1: S=\varnothing ,C=0$$//\mathrm{Reset} S,C$in Algorithm 1

$2: \mathbf{f}\mathbf{o}\mathbf{r} \mathbf{i}=\mathbf{1};\mathbf{i}<\mathit{N};\mathbf{i}++$ do

$3: \mathrm{calculate} \mathrm{video} \mathrm{texture} \mathrm{changes} \mathrm{fraction} TC(I^i,I^{i+1})$

$4: \mathbf{i}\mathbf{f} TC(I^i,I^{i+1})THR\_R1$ then

$5: \mathrm{add} i$$\mathrm{into} S$

$6: C += 1$

7:    end if

8: end for

$9: \mathbf{i}\mathbf{f} C\ge 1$ then

10:   (a) return FORGED VIDEO

$11: \left(\mathrm{b}\right) \mathrm{store} S,C$

12:else return ORIGINAL VIDEO

13:end if