GST_EVENT_FLUSH_START raised twice in single seek

[naseeb_panghal]

I have player created using gstreamer.
Source Element: filesrc(pull-mode)

when i perform seek then GST_EVENT_FLUSH_START is created twice. I confirmed it with gdb breakpoint.

I don't understand why it is raised twice. I have read almost all the documentation related to SEEK and FLUSH start event but not found any explanation.

As per documentation, i think single FLUSH_START should be able to discard old data.

[Baby Octopus]

Firstly, is your seek working fine? Are you doing a seek with the seek_flag set to FLUSH?

[Tim Müller]

On Thu, 2017-06-15 at 04:44 -0700, naseeb_panghal wrote:

Hi,

> I have player created using gstreamer. 
> Source Element: filesrc(pull-mode)
>
> when i perform seek then GST_EVENT_FLUSH_START is created twice. I
> confirmed it with gdb breakpoint.
>
> I don't understand why it is raised twice. I have read almost all the
> documentation related to SEEK and FLUSH start event but not found any
> explanation.

The parser or demuxer's seek handler (called from the application
thread that pushed the seek event into the pipeline) will send a flush-
start event downstream and one upstream, as the parser/demuxer
streaming thread might currently be doing or preparing to do a pull()
or a push(). This way the streaming thread will bail out and stop
itself at the next possible opportunity, and the parser/demuxer can be
reconfigured to start from the new position.

Cheers
 -Tim

--
Tim Müller, Centricular Ltd - http://www.centricular.com

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[naseeb_panghal]

Yes seek is working fine...and below is code snippet for seek api.

gst_element_seek_simple (data->gstpipeline->pipeline, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT, (gint64)(value * GST_SECOND));