diff two vids

[Krzysztof Konopko]

Hi Carl,
I was just curious what your pipeline does and the following did not
have negotiation error:
gst-launch-1.0 -e \     filesrc location=v1.mp4 ! qtdemux ! decodebin !
\         videoconvert ! mix. \     filesrc location=v2.mp4 ! qtdemux !
decodebin ! \         videoconvert ! mix. \  frei0r-mixer-difference
name=mix ! \ fakesink
ie. no caps enforced in the pipeline explicitly and 'videoconvert'
negotiating the best common format.
BTW, adding `--gst-debug=3` option showed me that (in my case at least)
I420 was still used instead of RGBA.
Hope this helps,Kris
On Sun, 2019-09-01 at 15:05 -0500, Carl Karsten wrote:
> gst-launch-1.0 -e \
>     filesrc location=v1.mp4 ! qtdemux ! decodebin ! \
>     filesrc location=v2.mp4 ! qtdemux ! decodebin ! \
>  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(6073): 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 ...
> 
> This works:
> gst-launch-1.0 -e     filesrc location=v1.mp4 ! qtdemux ! decodebin !
> fakesink
> 
> 
> 
> 
> 
> 
> On Wed, Aug 28, 2019 at 12:43 PM Carl Karsten <carl at nextdayvideo.com>
> wrote:
> > 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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