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Avconv: Overylaying multiple offset videos

I am trying to overlay several videos on a split screen with different offset (audio, video and offset), initially I tried to compensate and overlay, as shown below.

avconv -i 1.webm -itsoffset 2 -s 640x480 -vf "movie=1.webm, scale=320:480 [vid2]; [vid2] overlay=0:0 [basis1]; [basis1][1] overlay=320:0" splitScreenOut.mp4

& offset video is offset:

 movie=overlay.avi:seek_point=1.4

But this approach did not work at my end, -itsoffset offsets all video output and seek_point not recognized by my avconv construct.

Then I tried to compensate each video separately.

 avconv -itsoffset 4 -i 1.webm -c copy tmp1.webm

& just overlay

 avconv -i tmp1.webm -s 640x480 -vf "[in] scale=640/3:480, pad=3.01*iw:ih [video0]; movie=tmp2.webm, scale=640/3:480 [video1];[video0][video1] overlay=(640)/3:0 [VidO1]; movie=tmp3.webm, scale=640/3:480 [video2];[VidO1][video2] overlay=(640/3)*2:0 [out]" -b:v 768k Output.webm<

The problem is that all the videos are launched in split screen mode, from the offset of the first video, as if the individual correction did not work.

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