Hi, I have tried to append two mp4 videos using the following command vlc "input.mp4" "endframe3.mp4" --sout=#gather{} --sout-keep --sout '#transcode{vcodec=h264,venc=x264{keyint=250,min-keyint=10,scenecut=40,bframes=1,bpyramid=1,qp=51,qpmin=0,ratetol=800,vbv-bufsize=250,vbv-maxr...