Missing a decoder for a newly developed gstreamer media type

[Anton Pryima]

Hello Eslam.

I'm sorry, I was not able to quickly find appropriate links, but overall
idea is: you should check, does your plugin/caps properly registered
through all plugins/caps tree, and available during automatic caps
selection/testing.

Best regards,
Anton.

On Thu, Sep 9, 2021 at 6:25 PM Eslam Ahmed via gstreamer-devel <
gstreamer-devel at lists.freedesktop.org> wrote:

> Hello,
>
> I have recently developed a new media type called `video/x-mytype` which
> is basically an encoded video stream, say H264, that has some encoded
> metadata prepended on it. To that end, I have written 2 elements mytypemux
> and mytypedemux namely.
>
> Consequently, mytypemux takes 'video/x-h264' and produces `video/x-mytype`
> and mytypedemux takes `video/x-mytype` and produces whatever was tagged by
> mytypemux which is in this case none other than the 'video/x-h264'.
>
> I wanted to send `video/x-mytype` over the network, so I used `rtpgstpay`
> to payload what was coming out of mytypemux  into `GstRTSPMediaFactory`,
> mounted it and served as an rtsp stream.
>
> In the receiving pipeline, the following happens which works perfectly:
> `gst-launch-1.0 rtspsrc location=rtsp://localhost:8884/test ! rtpgstdepay
> ! mytypedemux ! h264parse ! avdec_h264 ! videoconvert ! autovideosink`
>
> Now, I am trying to make it work via a `uridecodebin` but I keep getting
> the following error from the `decodebin`:
> `Missing decoder: video/x-mytype (video/x-mytype)`
>
> So the pipeline knows about the type of the media type so there's no need
> for typefinding, it just needs a decoder. I had hoped that it would
> auto-plug `mytypedemux` but it didn't.
>
> So, What do I need to do to make the uridecodebin pick my demuxer?
>
> FYI:
>
>    - `gst-inspect-1.0 --print-plugin-auto-install-info
>    /usr/local/lib/gstreamer-1.0/libmytypedemux.so` produces
>    `element-mytypedemux` so it's an element but not a decoder?
>    - mytypedemux has a primary Rank
>
>
> Best Regards,
> Eslam Ahmed
>
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