Seeking when streaming to udpSink

[doubledw]

Tim,

Your alternative suggestion looks like it might nicely fit my needs. I
am already supporting playback to a local window in conjunction with
the udpSink just in 2 independent pipelines. I assume that if I want
to modify my existing pipeline that plays to a local window to also
support the intervideosink then I will have to tee the pipleline.

I will give this coupling approach a try.

Thanks a lot,
Doug

On Tue, Sep 27, 2016 at 5:37 PM, Tim Müller [via GStreamer-devel]
<ml-node+s966125n4679823h6 at n4.nabble.com> wrote:
> On Tue, 2016-09-27 at 12:54 -0700, doubledw wrote:
>
> Hi,
>
> At first glance it looks like the encoder not handling seeks / flushing
> properly.
>
> I have something else for you to try which might work better for you:
>
> Create two separate pipelines in the same application - one that
> encodes/streams and one that decodes/seeks/etc.
>
> In the playback pipeline you use intervideosink as video sink, and in
> the encoding pipeline you use intervideosrc as source element.
>
> The video data from the intervideosink will be sent to the
> intervideosrc, but both are decoupled, so if you pause the playback
> pipeline, the streaming pipeline will just keep repeating and streaming
> the last frame (or go black after a while, depending what you set the
> timeout to). If you seek on the playback pipeline the streaming part
> will repeat the last frame until the seek is complete and then output
> frames from the new position (but with monotonically increasing
> timestamps, so the encoder will never know there was a discontinuity).
> If you play back at half speed or double speed, the streaming part will
> encode that at the playback speed and stream it out normally.
>
> For the decoding pipeline you can just use a playbin element and set
> the "video-sink" property to an intervideosink (GstElement *).
>
> On the streaming pipeline you want something like:
>
>   intervideosrc ! video/x-raw,framerate=25/1 ! videoconvert
> ! avenc_mpeg2video ! mpegtsmux ! udpsink
>
> If you want audio as well, there's also interaudiosink/src which work
> the same way.
>
> Good luck!
>
> Cheers
> -Tim
>
> --
> Tim Müller, Centricular Ltd - http://www.centricular.com
>
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-- 
Doug Wood  |  Principal Software Engineer
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