handling multipe rtp sources with videomixer where there is no data on one source

[Florian Nierhaus]

Hi,

I want to mix multiple rtp video sources and output them live.

I noticed that if any of the rtp video sources receives no data, then
videomixer doesn't mix (and there is no output).

I would prefer to to just ignore the empty input (or treat it as
transparent).

Any suggestions? Is there some plugin which just produces transparent video
if there is nothing in the source pad - or some flag I have missed.

The pipeline seems to be in PLAYING state.


My pipeline roughly is:
gst-launch-1.0 -v flvmux name=flvmux ! queue ! rtmpsink location=foo

videomixer name=mix ! queue ! videoconvert
                                                      ! openh264enc
complexity=2 gop-size=120 max-bitrate=3072000 usage-type=screen
bitrate=2800000 ! h264parse ! queue ! flvmux.

udpsrc port=58988 caps=application/x-rtp, media=(string)video,
payload=(int)100, clock-rate=(int)90000, encoding-name=(string)VP8

! rtpjitterbuffer do-lost=true ! rtpvp8depay ! vp8dec ! videoscale !
video/x-raw,width=1280,height=720 ! mix.

udpsrc port=58984 caps=application/x-rtp, media=(string)video,
payload=(int)100, clock-rate=(int)90000, encoding-name=(string)VP8

! rtpjitterbuffer do-lost=true ! rtpvp8depay ! vp8dec ! videoscale !
video/x-raw,width=320,height=240   ! alpha method=custom target-r=0
target-g=177 target-b=64 angle=25
      ! videobox border-alpha=0 top=-480 left=0 ! videoconvert ! mix.


thank you,
Florian
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