gnlfilesource start problems

[aetitcomb]

I'm using videomixer to combine 2 videos.  It works well, except that I want
to offset the timing of one of the clips.  I'm using gnlfilesource and
define the 'start' value for the 2nd clip.  For some reason, no matter what
'start' value I put in, the 2nd clip always starts at the first frame.  I
need it to be delayed by 10 frames.  

Here's my pipeline:

gst-launch-0.10 \
gnlfilesource location=clipA.mov \
caps=video/x-raw-yuv start=0 media-start=0 duration=2083333333
media-duration=2083333333 name=fileSrc_clipA ! \
ffmpegcolorspace ! \
alpha alpha=1 ! \
mix. \
gnlfilesource location=clipB.mov \
caps=video/x-raw-yuv start=416666666 media-start=0 duration=2083333334
media-duration=2083333334 name=fileSrc_clipB ! \
ffmpegcolorspace ! \
alpha name=srcBalpha alpha=0.5 ! \
videomixer background=black name=mix ! \
videobox name=stereoCropper bottom=0 ! \
videoscale name=scale ! \
ffmpegcolorspace ! \
jpegenc ! \
qtmux ! \
filesink location=./test.mov






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