Overlay without major performance hit?

[Mailing List SVR]

Hi,

I suggest to use an hw accelerated overlay, take a look here:

https://github.com/popcornmix/omxplayer/blob/master/SubtitleRenderer.cpp#L391

eglglessink use 0 as layer value, you have to use a value > 0 to display 
the overlay on the top of the one created by eglglessink,

I'm not aware of any gstreamer element that do this, you have to create 
the overlay manually or create a new gstreamer element for that

Nicola


Il 15/03/2014 08:12, Michael Tyson ha scritto:
> Hello,
>
> I’m trying to use cairooverlay to add some content to live video frames displayed on a Raspberry Pi.
>
> I’ve not been able to get video frames to appear onscreen while drawing from udpsrc, so I did some testing using get-inspect and a file-based test video:
>
> gst-launch-1.0 filesrc location=big_buck_bunny_720p_H264_AAC_25fps_3400K.MP4 ! qtdemux ! h264parse ! omxh264dec ! autovideoconvert ! cairooverlay ! autovideoconvert ! eglglessink
>
> I discovered that including cairooverlay in the video pipeline introduces a massive performance hit at 720p: The video playback goes from the video’s native framerate to about 1 or 2 frames per second. I guess cairooverlay doesn’t work with the zero-copy stuff happening between omxh264dec and eglglessink.
>
> Curious about using appsrc and videomixer instead, I tried another pipeline, using videotestsrc (in place of appsrc) and a videomixer:
>
> gst-launch-1.0 filesrc location=big_buck_bunny_720p_H264_AAC_25fps_3400K.MP4 ! qtdemux ! h264parse ! omxh264dec ! autovideoconvert ! videomixer name=mix !  eglglessink sync=false videotestsrc ! mix.
>
> The same thing happened: Frame rate dropped below usable values.
>
> I’m wondering: Is there any way, using the Gstreamer framework, that one can achieve acceptable frame rates while applying an overlay?
>
> Cheers,
> Michael
>
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