decodebin - static linking of decoder and sink

[Ash 20001]

Or more specifically how to statically link decoder to sink via decodebin but without waiting for the pad-added signal.

From: ash20001 at hotmail.com
To: gstreamer-devel at lists.freedesktop.org
Subject: RE: decodebin - static linking of decoder and sink
Date: Tue, 26 Apr 2016 07:04:38 -0700




The stream is just an elementary H264 stream and I am told that this decoder can handle 1 frame of latency with a special property which I am settings.If the decoder can handle this, how do I do it?

Subject: Re: decodebin - static linking of decoder and sink
From: sebastian at centricular.com
To: gstreamer-devel at lists.freedesktop.org
Date: Tue, 26 Apr 2016 11:16:41 +0300

On Di, 2016-04-26 at 01:11 -0700, Ash 20001 wrote:
> Hello everyone!
> I have a pipeline currently using appsrc ! decodebin ! xvimagesink,
> which processes Raw H264 frames. Problem is I have to feed in at
> least 2 frames of H264 buffers to appsrc before decodebin will emit
> its pad-added signal and link the pads between the decoder (which is
> a HW decoder element) and the xvimagesink. 
> 
> 1. Is there anyway to statically link the decoder and xvimagesink
> pads ahead of time so I don't have to wait for 2 frames before it is
> done?
> 2. Or is there an alternative to minimize the 2 frame latency?
> Ideally I want to push 1 frame and have that render via xvimagesink
> immediately. 
 
This completely depends on the actual decoder that is used and the
properties of the stream. Most likely your decoder has 2 frames of
latency on the stream you're feeding it, which might be possible to
optimize in this specific decoder or it's an intrinsic property of this
specific stream.
 
-- 
Sebastian Dröge, Centricular Ltd · http://www.centricular.com
 

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