videomixer2, videobox Caps not compatible with other pads' caps

[art vanderhoff]

Hello all,

I am having some trouble figuring out why changing a videobox size causes
Caps not compatible with other pads' caps

if I run this pipeline and make adjustments to videobox, it works as
expected, being able to position the videobox at x/y.

GST_DEBUG=2 gst-launch  \
 uridecodebin  uri=file:///home/content/aaa.mp4 download=false  !
ffmpegcolorspace ! videoscale \
     ! capsfilter 
caps="video/x-raw-yuv,format=(fourcc)I420,width=200,height=200,framerate=(fraction)25/1" 
\
     ! videobox border-alpha=0 top=-100 left=-100   ! mix. \
  videomixer2 background=black name=mix \
     ! ffmpegcolorspace !  videoscale \
     ! capsfilter 
caps="video/x-raw-yuv,width=640,height=352,framerate=(fraction)25/1" \
     ! ffmpegcolorspace ! x264enc pass=pass1 threads=0 bitrate=900
tune=zerolatency ! flvmux name=mux  streamable=true \
     ! filesink  location=/home/content/out/zzz.mp4




Now if I add a 2nd input and leave videobox as 0,0,0,0 on both, the
videoscale works as expected and outputs as expected

GST_DEBUG=2 gst-launch  \
 uridecodebin  uri=file:///home/content/aaa.mp4 download=false  !
ffmpegcolorspace ! videoscale \
     ! capsfilter 
caps="video/x-raw-yuv,format=(fourcc)I420,width=200,height=200,framerate=(fraction)25/1" 
\
     ! videobox border-alpha=0 top=0 left=0   ! mix. \
  videomixer2 background=black name=mix \
     ! ffmpegcolorspace !  videoscale \
     ! capsfilter 
caps="video/x-raw-yuv,width=640,height=352,framerate=(fraction)25/1" \
     ! ffmpegcolorspace ! x264enc pass=pass1 threads=0 bitrate=900
tune=zerolatency ! flvmux name=mux  streamable=true \
     ! filesink  location=/home/content/out/zzz.mp4 \
  uridecodebin  uri=file:///home/content/bbb.mp4 download=false  !
ffmpegcolorspace ! videoscale \
     ! capsfilter 
caps="video/x-raw-yuv,format=(fourcc)I420,width=200,height=200,framerate=(fraction)25/1" 
\
     ! videobox border-alpha=0 top=0 left=0   ! mix. 



The error generates if I change either of the videobox settings, such as,
GST_DEBUG=2 gst-launch  \
 uridecodebin  uri=file:///home/content/aaa.mp4 download=false  !
ffmpegcolorspace ! videoscale \
     ! capsfilter 
caps="video/x-raw-yuv,format=(fourcc)I420,width=200,height=200,framerate=(fraction)25/1" 
\
     ! videobox border-alpha=0 top=0 left=0   ! mix. \
  videomixer2 background=black name=mix \
     ! ffmpegcolorspace !  videoscale \
     ! capsfilter 
caps="video/x-raw-yuv,width=640,height=352,framerate=(fraction)25/1" \
     ! ffmpegcolorspace ! x264enc pass=pass1 threads=0 bitrate=900
tune=zerolatency ! flvmux name=mux  streamable=true \
     ! filesink  location=/home/content/out/zzz.mp4 \
  uridecodebin  uri=file:///home/content/bbb.mp4 download=false  !
ffmpegcolorspace ! videoscale \
     ! capsfilter 
caps="video/x-raw-yuv,format=(fourcc)I420,width=200,height=200,framerate=(fraction)25/1" 
\
     ! videobox border-alpha=0 top=-100 left=-100   ! mix. 


any ideas would be much appreciated,
thx
Art



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