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Bug 738129 - GstGLMixer download texture even if sink element is gl based
GstGLMixer download texture even if sink element is gl based
Product: GStreamer
Classification: Platform
Component: gst-plugins-bad
git master
Other Linux
: Normal normal
: 1.5.1
Assigned To: GStreamer Maintainers
GStreamer Maintainers
Depends on:
Reported: 2014-10-08 02:57 UTC by comicfans44
Modified: 2014-10-20 15:02 UTC
See Also:
GNOME target: ---
GNOME version: ---

Description comicfans44 2014-10-08 02:57:42 UTC
I found commit 
gl: download whenever we have sysmem capsfeatures

cause GstGLMixer always download texture ,even if sink element is glimagesink or glfilter .

GstGLMixer _negotiated_caps always receive caps with capsfeatures "memory:SystemMemory", not "memory:GLMemory" , seems this causes the problem.
Comment 1 comicfans44 2014-10-13 07:34:57 UTC
seems that gst_videoaggregator_update_src_caps has problem related to this bug

line 588:

    caps = gst_video_info_to_caps (&info);  ------>caps from video info always missed the GLMemory feature (when subclass is GstGLMixer)

    peercaps = gst_pad_peer_query_caps (agg->srcpad, NULL);
    if (peercaps) {

    gst_caps_unref (caps);                  -----> maybe these two lines
    caps = gst_video_info_to_caps (&info);  -----> should be deleted? 

    if (gst_videoaggregator_src_setcaps (vagg, caps)) {

temp hack these seems get the correct intersected caps with downstream element, 
makes _negotiated_caps receiving the correct out_caps
Comment 2 Matthew Waters (ystreet00) 2014-10-20 15:02:16 UTC
commit f0caf04ad6bf6f04c53424a2057ffe988ad781b9
Author: Matthew Waters <>
Date:   Mon Oct 20 10:34:27 2014 +1100

    videoaggregator: operate on caps rather than video info
    Otherwise the CapsFeatures will be lost along with the possibility
    of multiple output types and formats.