If the "zipling" is baked into the video from a faulty 3D file, you must fix the source:
If the 3D video plays but the 3D effect is broken (e.g., the top-and-bottom or side-by-side alignment is shifted), re-encoding the file can force the streams back into alignment. zipling 3d video fix
ffmpeg -i input.mp4 -metadata:s:v:0 stereo_mode=left_right -c copy output.mp4 If the "zipling" is baked into the video