Understanding QOS in gstreamer

[Luis de Bethencourt]

On 3 June 2015 at 11:51, Baby Octopus <jagadishkamathk at gmail.com> wrote:

> Hi,
>
> I'm running some pipelines to understand QOS. I'm using checksumsink(since
> it prints timestamps) which sends QOS events and videoscale which handles
> QOS events. And I'm using my PC is intel i3 which can not handle the load.
> Here is the pipeline
>
> *gst-launch-1.0 videotestsrc is-live=1 ! videoscale qos=1 !
> video/x-raw,width=3840,height=2160 ! checksumsink qos=1 sync=1*
> PTS: 0:00:00.271404544  DTS: 0:00:00.271404544
> PTS: 0:00:00.304737877  DTS: 0:00:00.304737877
> PTS: 0:00:00.571404544  DTS: 0:00:00.571404544
> PTS: 0:00:02.304737877  DTS: 0:00:02.304737877
> PTS: 0:00:13.971404544  DTS: 0:00:13.971404544
>
> I expected the pipeline to run realtime with frame drops by videoscale. But
> this isn't happening. It just hangs
>
> Alternative pipeline with qos=0 at the videoscale runs as expected(Running
> slower without dropping any buffers)
> *gst-launch-1.0 videotestsrc is-live=1 ! videoscale qos=0 !
> video/x-raw,width=3840,height=2160 ! checksumsink qos=1 sync=1*
> PTS: 0:00:00.287512027  DTS: 0:00:00.287512027
> PTS: 0:00:00.320845360  DTS: 0:00:00.320845360
> PTS: 0:00:00.354178693  DTS: 0:00:00.354178693
> PTS: 0:00:00.387512027  DTS: 0:00:00.387512027
> PTS: 0:00:00.420845360  DTS: 0:00:00.420845360
> PTS: 0:00:00.454178693  DTS: 0:00:00.454178693
>
> Am I missing anything here in QOS concept?
>
> ~BO
>

Which version of GStreamer are you using? The first pipeline should drop
frames and not hang.

Thanks,
Luis
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