diff two vids

[Carl Karsten]

I encoded a 26min movie v1.mp4. Then I cut out 1 min from 9:00 to 10:00 and
added fad out/in and encoded to v2.mp4

Now I have AV sync problems that I can see at 7:00 I was doing some other
work and noticed the video hiccup a little: it paused then jumped and was
back in sync.

To try and narrow down where the problem is, I’d like to compare v1/v2
frame by frame and look for differences. There shouldn’t be any until the
fade at 9:00.

Which is why I am trying this, but stuck on an error:

$ gst-launch-1.0 -e \
>     filesrc location=v1.mp4 ! qtdemux ! decodebin ! \
>         video/x-raw, format=RGBA ! videoconvert ! mix. \
>     filesrc location=v2.mp4 ! qtdemux ! decodebin ! \
>         video/x-raw, format=RGBA ! videoconvert ! mix. \
>  frei0r-mixer-difference name=mix ! \
> fakesink

Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
Redistribute latency...
Redistribute latency...
Redistribute latency...
ERROR: from element /GstPipeline:pipeline0/GstQTDemux:qtdemux1:
Internal data stream error.
Additional debug info:
qtdemux.c(5850): gst_qtdemux_loop ():
/GstPipeline:pipeline0/GstQTDemux:qtdemux1:
streaming stopped, reason not-negotiated (-4)
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...



-- 
Carl K
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