gopbuffer

gopbuffer is an element that can be used to store a minimum duration of data delimited by discrete GOPs (Group of Picture). It does this in by differentiation on the DELTA_UNIT flag on each input buffer.

One example of the usefulness of gopbuffer is its ability to store a backlog of data starting on a key frame boundary if say the previous 10s seconds of a stream would like to be recorded to disk.

Example pipeline

 gst-launch videotestsrc ! vp8enc ! gopbuffer minimum-duration=10000000000 ! fakesink

Hierarchy

GObject
    ╰──GInitiallyUnowned
        ╰──GstObject
            ╰──GstElement
                ╰──gopbuffer

Factory details

Authors: – Matthew Waters

Classification: – Video

Rank – primary

Plugin – gopbuffer

Package – gst-plugin-gopbuffer

Pad Templates

`video_sink`

video/x-h264:
  stream-format: { (string)avc, (string)avc3 }
      alignment: au
video/x-h265:
  stream-format: { (string)hvc1, (string)hev1 }
      alignment: au
video/x-vp8:
video/x-vp9:
video/x-av1:
  stream-format: obu-stream
      alignment: tu

Presence – always

Direction – sink

Object type – GstPad

`video_src`

video/x-h264:
  stream-format: { (string)avc, (string)avc3 }
      alignment: au
video/x-h265:
  stream-format: { (string)hvc1, (string)hev1 }
      alignment: au
video/x-vp8:
video/x-vp9:
video/x-av1:
  stream-format: obu-stream
      alignment: tu

Presence – always

Direction – src

Object type – GstPad

Properties

max-size-time

“max-size-time” guint64

The maximum duration to store (0=disable)

Flags : Read / Write

Default value : 0

minimum-duration

“minimum-duration” guint64

The minimum duration to store

Flags : Read / Write

Default value : 1000000000

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