Merge 2 videos side-by-side

[Ormi]

Hi,

My machine is ArchLinux 4.8.13-1-ARCH 
I am trying to mix 2 videos together side by side, simultaneously with
Gstreamer(months before I was using ffmpeg so far). 

I was trying different approaches like...

1) 
/gst-launch-0.10 -v \
filesrc location=drop.avi ! avidemux name=demux1 \
filesrc location=drop.avi ! avidemux name=demux2 \
videomixer name=mix \
        sink_0::xpos=0   sink_0::ypos=0 sink_0::alpha=0 \
        sink_1::xpos=0   sink_1::ypos=0 \
        sink_2::xpos=256 sink_2::ypos=0 \
    ! xvimagesink \
videotestsrc pattern="black" \
    ! video/x-raw-yuv,width=512,height=240 \
    ! mix.sink_0 \
demux1.video_00 \
    ! queue ! decodebin ! ffmpegcolorspace ! videoscale \
    ! video/x-raw-yuv,width=256,height=240 \
    ! mix.sink_1 \
demux2.video_00 \
    ! queue ! decodebin ! ffmpegcolorspace ! videoscale \
    ! video/x-raw-yuv,width=256,height=240 \
    ! mix.sink_2/

But this crash on:
/ERROR: pipeline doesn't want to preroll./
(which is my most common error in all approaches)
I can't really understand what is the meaning of this error.

2)
/gst-launch filesrc location=Flamingo_HD.mp4 ! decodebin2 ! queue2 !
videoscale ! ffmpegcolorspace ! video/x-raw-rgb,width=320,height=180 !
ffmpegcolorspace ! videobox left=-320 border-alpha=0 ! videomixer2 name=mix
! ffmpegcolorspace ! ximagesink filesrc location=Flamingo_HD.mp4 !
decodebin2 ! videoscale ! ffmpegcolorspace ! queue2 !
video/x-raw-rgb,width=320,height=180 ! ffmpegcolorspace ! videobox
border-alpha=0 ! mix.
/

I have working version of merge 2 videos to 1 in queue, is there a
posibility to change to to side-by-side?
/gst-launch-1.0 concat name=c ! queue ! avdec_h264 ! queue ! videoconvert !
videoscale ! autovideosink filesrc location=video1.mp4 ! qtdemux ! h264parse
! c. filesrc location=video2.mp4 ! qtdemux ! h264parse ! c./

Thanks!
Ormi





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