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

Marianna Smidth Buschle msb at
Mon Jan 31 07:55:54 UTC 2022

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


On 29.01.2022 00.30, gstreamer-devel-request at 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.
> 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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