play multiple sources at once, each from a different position

[Nicolas Dufresne]

Le lundi 24 janvier 2022 à 02:18 +0100, Tomasz Mikolajczyk via gstreamer-devel a
écrit :
> 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

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