Unable to trans size video

[Yu You]

as you may also change the frame rate, can you try to add a "videorate"
element after the videoscale?

Regards,

Yu

On Fri, 27 Oct 2023, 10:50 Busayo Famutimi via gstreamer-devel, <
gstreamer-devel at lists.freedesktop.org> wrote:

> Hello devs,
>
> Please I am having a challenge trying to reduce the size of a video.
>
> I am using the command below
>
>  gst-launch-1.0.exe filesrc location=/path/to/mp4 ! qtdemux name=d
> d.video_0 ! h264parse ! avdec_h264 ! videoconvert ! videoscale !
> video/x-raw,width=1280,height=720,framerate=15/1 ! autovideosink
>
> But I am getting the following error:
>
> ../gst-plugins-good-1.22.6/gst/isomp4/qtdemux.c(6976): gst_qtdemux_loop
> (): /GstPipeline:pipeline0/GstQTDemux:d:
> streaming stopped, reason not-linked (-1)
> WARNING: from element /GstPipeline:pipeline0/GstQTDemux:d: Delayed linking
> failed.
> ERROR: pipeline doesn't want to preroll.
> Additional debug info:
> gst/parse/grammar.y(855): gst_parse_no_more_pads ():
> /GstPipeline:pipeline0/GstQTDemux:d:
> failed delayed linking pad  video_0 of GstQTDemux named d to some pad of
> GstH264Parse named h264parse0
> Setting pipeline to NULL ...
> Freeing pipeline ...
>
> A quick note:
> If I remove the videoconvert, videoscale & caps-filter from the pipeline
> it works.
>
> I am just struggling to understand why the demux element cannot link to
> the next element when they are caps compatible. I know I am missing out on
> something but I can't seem to figure it out.
>
> Thanks.
>
> Kind regards.
>
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