play multiple sources at once, each from a different, position

[Tomasz Mikolajczyk]

Thanks. They must be in sync. For instance, one of the streams is a
presenter video, the second one is his/her mask and the 3rd one is an
artificial background I would like to apply to the presenter video. So all
of the streams must be in sync, including audio.

Looking forward to using support for alpha in webm in 1.20.

Regards,
Tomasz

On Mon, Jan 31, 2022 at 8:55 AM Marianna Smidth Buschle <msb at qtec.com>
wrote:

> Out of curiosity, why do you want it in a single pipeline?
>
> If you are just outputting them to their own video sinks why not to just
> have 2 pipelines, so that they don't interact with each other?
>
> Best Regards
>
> Marianna
>
> On 29.01.2022 00.30, gstreamer-devel-request at lists.freedesktop.org wrote:
> > Hi,
> > I would like to use gstreamer to play multiple sources (for instance two
> > video files) simultaneously using a single pipeline but each video
> starting
> > from a different position, for instance first video from the beginning
> and
> > the second from the middle. Could someone guide me on how to achieve it?
> >
> > Simplifying, my pipeline is an equivalent of:
> >
> >
> > This use case is better handled by GES, which offers ges-launch-1.0
> > command line to test.
> >
> >
> >
> https://gstreamer.freedesktop.org/documentation/gst-editing-services/?gi-language=c
> >
> > gst-launch-1.0 \
> > uridecodebin
> uri=file:///Users/tmikolaj/Downloads/videoalpha_video_dancer1.webm  !
> videoconvert ! autovideosink \
> > uridecodebin
> uri=file:///Users/tmikolaj/Downloads/videoalpha_video_dancer1.webm  !
> videoconvert ! autovideosink
> > , but created programmatically.
> > Obviously, a simple pipeline's seeking seeks two files at once.
> > I was trying to register a probe of the
> GST_PAD_PROBE_TYPE_EVENT_UPSTREAM type from inside the "pad-added" signal
> callback of the "uridecodebin" element. Inside the probe I wanted to catch
> the "GST_EVENT_SEEK" event and drop it for the first video. However, it
> seems that dropping the SEEK message leaves the pipeline in a "PAUSED"
> state and even an explicit state change to "PLAYING" does nothing.
> > Does anybody have some hints on how to solve that problem?
> >
> > Regards,
> > Tomasz
> >
> --
> Best regards / Med venlig hilsen
> “Marianna Smidth Buschle”
>
>
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