diff two vids

[Carl Karsten]

Thanks for the tip on videoconvert being common.   I always flounder on
what to try first.

I'm making progress - no errors with fakesink and xvimagesink

now to write a file.

I should care about this?

(gst-launch-1.0:3996): GStreamer-CRITICAL **: 15:04:04.049:
gst_segment_to_running_time: assertion 'segment->format == format' failed

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 ! \
 videoconvert ! \
 avenc_mpeg2video ! mpegtsmux ! filesink location=diff.mp4

same with   x264enc


On Mon, Sep 2, 2019 at 5:17 AM Krzysztof Konopko <
krzysztof.konopko at konagma.eu> wrote:

> 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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-- 
Carl K
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