Picture in Picture ts-remux

[Richard]

Hi all,

I am trying to get a picture-in-picture image working and the below
video mixer command seems to do the trick when using the ximagesink,
but when I change to mpeg2enc ! mpegtsmux ! filesink
location=/tmp/out/ts the videobox does not link to the mixer.

(putting a snow icon on the top of the TS video)


gst-launch -e videomixer name=mix ! ffmpegcolorspace ! xvimagesink \
videotestsrc pattern=1 !
video/x-raw-yuv,framerate=5/1,width=20,height=20 ! videoscale !
videobox border-alpha=0 top=0 left=0 ! mix. \
filesrc location=BBC1_DVBS.ts ! decodebin name=demux ! videoscale ! mix.

This is the command I am using that gives the error.. I have tried
adding a ! ffmpegcolorspace ! before the mix. and the error just
moved.

[Command]
 gst-launch -e videomixer name=mix ! ffmpegcolorspace ! mpeg2enc !
mpegtsmux name=mux ! filesink location=/tmp/a.ts videotestsrc
pattern=1 ! video/x-raw-yuv,framerate=5/1,width=20,height=20 !
videoscale ! videobox border-alpha=0 top=0 left=0 ! mix. filesrc
location=BBC1_DVBS.ts ! decodebin name=demux ! videoscale ! mix.
[/end command]
WARNING: erroneous pipeline: could not link videobox0 to mix

The main difference is the final sink destination. Can anyone shed
some light why ximagesink works but a mpeg sink fails?

Regards,
Richard