Poor HD performance with appsink

[Gordon Nickel]

Thanks Dusan, that's very helpful.

How are you getting the video data from Gstreamer to OpenGL? I suspect that might be where the slowdown might be happening in my code, since the copy is on the main thread.

Here's the implementation I'm using: https://gist.github.com/gordeaoux/8978998

Which is based on this cinder wrapper: https://github.com/cadet/_2RealGStreamerWrapper/blob/master/src/_2RealGStreamerWrapper.cpp

Gordon Nickel

-----Original Message-----
From: gstreamer-devel-bounces at lists.freedesktop.org [mailto:gstreamer-devel-bounces at lists.freedesktop.org] On Behalf Of Dušan Poizl
Sent: Thursday, February 13, 2014 8:26 AM
To: Discussion of the development of and with GStreamer
Subject: Re: Poor HD performance with appsink

I used QtGstreamer but because it is not for gstreamer-1.0 I must rewrite my SW to use gstreamer directly. But you can get general idea from this code http://cgit.freedesktop.org/gstreamer/qt-gstreamer/tree/elements/gstqtvideosink/painters/openglsurfacepainter.cpp
which is where I started when I wrote my my own implementation.

Dňa 13.02.2014 16:45, Gordon Nickel wrote / napísal(a):
> Thanks for the responses. I'm using callbacks, not signals already.
>
> Dusan, how are you displaying content in OpenGL? Is there an implementation you would be willing to share?
>
> Gordon Nickel
>
> downstream.com
>
>> On Feb 13, 2014, at 7:39 AM, "Dušan Poizl" <poizl at maindata.sk> wrote:
>>
>> I am using appsink for playing video with OpenGL and have no issue. I can easily play two FullHD video fine while capturing output and pushing to appsrc to encode.
>>
>> Dňa 13.02.2014 16:14, Aleix Conchillo Flaqué wrote / napísal(a):
>>> On Wed, Feb 12, 2014 at 5:40 PM, Gordon Nickel 
>>> <gordon.nickel at downstream.com> wrote:
>>>> Hi,
>>>>
>>>> I have an implementation of Gstreamer 1.0 for Windows using appsink 
>>>> to play videos back. Generally, performance is pretty good, and 
>>>> quality is excellent. However, with some specific videos (all 
>>>> 1080p, 720p seems to be fine), the video track can get very far 
>>>> behind the audio, at which time the audio starts to stutter and 
>>>> eventually cut out. I don't believe it's an issue with the app 
>>>> itself (which generally gets 90-200 fps with videos running), but 
>>>> my implementation of Gstreamer. The same videos play without issue using playbin in gst-launch.
>>>>
>>>> I've tried setting drop frames ( gst_app_sink_set_drop to true ) 
>>>> and max lateness to various values from 1 second to 0.01 seconds. 
>>>> In doing so, the audio won't cut out, but the video will stutter to 
>>>> an unnacceptable degree (approx 1 frame per second). I've also 
>>>> tried different bit rates, but have generally stuck with h.264 for 
>>>> codecs. Mpeg 2 had similar performance issues.
>>>>
>>>> Playing the video through the app but with it's own directdrawsink 
>>>> window played back smoothly.
>>>>
>>>> I can provide the problem videos if that would be helpful.
>>>>
>>>> Gstreamer builds 1.0.10, 1.2.0 and 1.2.3 have all been tried with 
>>>> the same results.
>>>>
>>>> Any ideas to improve performance?
>>> You might already be doing it, but do you use signals instead of 
>>> callbacks? If so, use callbacks instead. Much faster.
>>>
>>> Aleix
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