CODEWITHSUNDEEP
gstreamergstreamer-1.0
Sogartar
Sogartar

Reputation: 2175

gstreamer: pass frame PTS in command line API

Currently I have a setup like this.

my-app | gst-launch-1.0 -e fdsrc ! \
    videoparse format=GST_VIDEO_FORMAT_BGR width=640 height=480 ! \
    videoconvert ! 'video/x-raw, format=I420' ! x265enc ! h265parse ! \
    matroskamux ! filesink location=my.mkv

From my-app I am streaming raw BGR frame buffers to gst. How can I also pass presentation timestamps (PTSs) for those frames? I have somewhat full control over my-app. I can open other pipes to gst from it.

I know I have the option to use gstreamer C/C++ API or write a gstreamer plugin, but I was trying to avoid this.

Upvotes: 1

Views: 2779

Answers (1)

Florian Zwoch
Florian Zwoch

Reputation: 7383

I guess you can set a framerate for the videoparse element. You can also try do-timestamp=true for the fdsrc - maybe it requires a combination of both.

If you have the PTS in my-app you would probably need to wrap buffers and PTS in a real GstBuffer and use gdppay and gdpdepay as payload between the link.

For example if your my-app would dump the images in the following format: https://github.com/GStreamer/gstreamer/blob/master/docs/random/gdp (not sure how recent this info document is)

You could receive the data with the following pipeline:

fdsrc ! gdpdepay ! videoconvert ! ..

No need for resolution and format either as it is part of the protocol too. And you will have PTS as well if set.

If you can use GStreamer lib in my-app you could some soome pipeline like this:

appsrc ! gdppay ! fakesink dump=true

And you would push your image buffers with PTS to the appsink.

See https://github.com/GStreamer/gst-plugins-bad/tree/master/gst/gdp for some examples how gdp is used as a protocol.

Upvotes: 2

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