High CPU usage decoding 4K 60fps video

[Bilel Bghiel]

Is it possible for you to use hardware acceleration? I'm using an 8th
generation Intel CPU, which VAAPI was made for. The avdec_h265 can be
replaced by an vaapih265dec.
Vaapi plugin:
https://gstreamer.freedesktop.org/documentation/vaapi/index.html?gi-language=c
I think there's also other libraries for non-Intel hardware, but I'm not
sure about that.

On Tue, Jul 26, 2022 at 10:45 AM Sergio González via gstreamer-devel <
gstreamer-devel at lists.freedesktop.org> wrote:

> Dear All,
>
> I am having an issue when using gstreamer to decode 4K 60fps video in a
> custom app.
>
> The pipeline's structure is as follows:
>
> appsrc ! queue ! typefind ! h265parse ! capsfilter ! avdec_h265 ! queue !
> videoconvert ! queue ! appsink
>
> What I am observing is that when I push buffers to the appsrc, if the
> decoding components are linked, there is a high surge of CPU consumption
> (as in, 12 of the 16 cores are at 100%). However, if on the same machine I
> just execute the same pipeline with gst-launch, the cpu usage is way more
> reasonable and the decoding goes smoothly.
>
> Adding a Probe to the sink and the source pads of the avdec_h265 tells me
> that the time between decoding buffers at the beginning is of about 200ms,
> but as app keeps decoding, it soon reaches 600ms.
>
> Do you have some insight on what might cause this? Maybe I am missing some
> property in some of the components?
>
> Any help would be much appreciated. Let me know if you need any more
> information.
>
> Cheers,
> Sergio
>
>
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