webrtcbin -> videoscale results in black frames, why ?

[Mathieu Duponchelle]

I think I'd try elimintating intervideosink from the equation first, and directly plug the
output to a display sink to see if the problem goes away. Then I would check the logs
for potential warnings, with GST_DEBUG=2.

On 4/15/20 5:37 PM, Michael wrote:
> Hello everybody,
>
> I am struggling a bit with the fact that webrtcbin -> decodebin and then scaling pipeline is not working as expected.
>
> I get an incoming Pad (incoming_decodebin_pad)
>
> video/x-raw, format=(string)I420, width=(int)640, height=(int)480, interlace-mode=(string)progressive, multiview-mode=(string)mono, multiview-flags=(GstVideoMultiviewFlagsSet)0:ffffffff:/right-view-first/left-flipped/left-flopped/right-flipped/right-flopped/half-aspect/mixed-mono, pixel-aspect-ratio=(fraction)1/1, chroma-site=(string)jpeg, colorimetry=(string)bt601, framerate=(fraction)0/1
>
> which works perfectly if I do not scale it
>
> Bildschirmfoto 2020-04-15 um 16.02.06.png
>
> but if I add videoscale-> capsfilter between it to scale it to "video/x-raw,width=480,height=320" I just get black frames (next I added `method=0 add-borders=false`to videoscale same result!)and not even the right dimension.
>
> Bildschirmfoto 2020-04-15 um 15.59.56.png
>
> Here is my Pipeline for the first attempt without videoscale which works
>
> Bildschirmfoto 2020-04-15 um 16.12.21.png
>
> And the one with videoscale
>
> Bildschirmfoto 2020-04-15 um 16.12.52.png
>
> Full pipelines are attached as well.
>
> One thing to add. Even if I use the working pipeline the incoming webrtc video goes from videoimage to blackframe back to videoimage for at least 5 sec on START.
> The pipeline with videoscale never shows an image just black frame.
>
> Pipeline with scale full: black frame
> https://drive.google.com/file/d/16wMFgTs9C8cRaCGXSUvae6MS2gEISsCh/view?usp=sharing
>
> Pipeline without scale: works
> https://drive.google.com/file/d/1Gjqcmbm9x2UuepwwJ91upjf23jZJDq5U/view?usp=sharing
>
>
> Thank you in advance for any clue!
>
>
>
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