AW: dynamic videomixing

Sat Dec 13 10:54:24 PST 2014

Thanks a lot!!!

  _____  

Von: gstreamer-devel [mailto:gstreamer-devel-bounces at lists.freedesktop.org]
Im Auftrag von Sérgio Agostinho
Gesendet: Samstag, 13. Dezember 2014 19:48
An: Discussion of the development of and with GStreamer
Betreff: Re: dynamic videomixing

Gave it some more tests and apparently the issue is with the
pixel-aspect-ratio=64/45. The videomixer does not like it. I managed to work
around it by adding a videoscale element before the the videomixer. 

gst-launch-1.0 -ve videotestsrc ! video/x-raw, format=I420, width=720,
height=576, pixel-aspect-ratio=64/45, interlace-mode=mixed,
chroma-site=mpeg2, colorimetry=bt601, framerate=25/1 ! videoscale !
videomixer ! xvimagesink

2014-12-13 19:34 GMT+01:00 Bernhard Graaf <bernhard.graaf at gmx.de>:

Absolute the same result.

  _____  

Von: gstreamer-devel [mailto:gstreamer-devel-bounces at lists.freedesktop.org]
Im Auftrag von Sérgio Agostinho
Gesendet: Samstag, 13. Dezember 2014 19:18

An: Discussion of the development of and with GStreamer
Betreff: Re: dynamic videomixing

It is clear that you're having a format issue when you're adding the
videomixer.  What happens if you place a deinterlace element before the
videomixer?

2014-12-13 18:46 GMT+01:00 Bernhard Graaf <bernhard.graaf at gmx.de>:

See attached files

  _____  

Von: gstreamer-devel [mailto:gstreamer-devel-bounces at lists.freedesktop.org]
Im Auftrag von Sérgio Agostinho
Gesendet: Samstag, 13. Dezember 2014 18:23

An: Discussion of the development of and with GStreamer
Betreff: Re: dynamic videomixing

Paste the console output of your pipeline

gst-launch-1.0 -v tcpclientsrc host='192.168.1.4' port=12000 ! queue2 !
decodebin name=decoder decoder. ! queue ! audioconvert ! audioresample !
pulsesink   decoder. !  queue ! videoconvert ! xvimagesink

and also with the videomixer

gst-launch-1.0 -v tcpclientsrc host='192.168.1.4' port=12000 ! queue2 !
decodebin name=decoder decoder. ! queue ! audioconvert ! audioresample !
pulsesink   decoder. !  queue ! videoconvert ! videomixer ! xvimagesink

2014-12-13 18:12 GMT+01:00 Bernhard Graaf <bernhard.graaf at gmx.de>:

Hi Sèrgio,

I have checked this. If I try to test the pipeline with gst-launch, I get
the same result (whatever position, before queue, after queue, after
videoconvert). 

gst-launch-1.0 -vvv tcpclientsrc host='192.168.1.4' port=12000 ! queue2 !
decodebin name=decoder decoder. ! queue ! audioconvert ! audioresample !
pulsesink   decoder. !  queue ! videoconvert ! xvimagesink

The pipeline is hanging. If I remove only the videomixer, the pipeline is
working well.

The gst_pad_link() returned GST_PAD_LINK_NOFORMAT.

Any Idea?

Bernhard

  _____  

Von: gstreamer-devel [mailto:gstreamer-devel-bounces at lists.freedesktop.org]
Im Auftrag von Sérgio Agostinho
Gesendet: Samstag, 13. Dezember 2014 16:38
An: Discussion of the development of and with GStreamer
Betreff: Re: dynamic videomixing

Hi Bernhard, 

I've tested the pipeline below and it works so the answer to your initial
question is, yes you can have only one sink pad in the video mixer

gst-launch-1.0 -ev v4l2src ! videomixer ! xvimagesink

Regarding the second question. 

gst_pad_link()
<http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/Gst
Pad.html#gst-pad-link>  returns the reason why the link failed, and it is
normally quite descriptive as you can see on 

http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstP
ad.html#GstPadLinkReturn . Try to see what it is returning in your case.

Also have you tried to test your pipeline in gst-launch with the video
mixer?

Sérgio

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