I am about to give up on this. It now feels to me like a bug in gst-launch:
The short story is this doesn't work:
gst-launch-1.0 filesrc location=/home/wgj/video/Truck.H264.ts name=fs
misbdemux name=md tsdemux name=td h264parse name=hp avdec_h264
name=ad videoconvert name=vc misbfixcoordinates name=mf misbsink
name=ms \
fs.src ! md.sink \
md.misbsrc ! mf.misbsink mf.misbsrc ! ms.sink \
md.src ! td.sink td. ! hp.sink hp.src ! ad.sink ad.src ! vc.sink
vc.src ! mf.videosink mf.videosrc ! ms.videosink
It give the error:
WARNING: erroneous pipeline: could not link vc to mf
But it should be able to link vc to mf and in fact it does if I leave
off the other path:
gst-launch-1.0 filesrc location=/home/wgj/video/Truck.H264.ts name=fs
misbdemux name=md tsdemux name=td h264parse name=hp avdec_h264
name=ad videoconvert name=vc misbfixcoordinates name=mf misbsink
name=ms \
fs.src ! md.sink \
md.src ! td.sink td. ! hp.sink hp.src ! ad.sink ad.src ! vc.sink
vc.src ! mf.videosink mf.videosrc ! ms.videosink
Now it works. I can't think of anything that would cause it to work in
one case and fail in the other. I'm completely stumped, but I hardly
understand gstreamer so that's not a surprise.
The problem element is misbfixcoordinate. I could post the code for it.
It's pretty basic though. It has two sink pads (one video and one
meta/klv) and it has two source pads (one video and one meta/klv).
Right now there is a chain function on each pad that simply pushes the
received buffer out the corresponding source pad. There is an event
function attached to each sink pad. There is a query function attached
to each source pad. Both the event functions and the query functions
simply call the default gst pad functions. So misbfixcoordinate is
simply a minimalistic element with two inputs and two outputs.
Does anyone have any thoughts on what might be the problem?
The next thing I'm going to try is to write an application that forces
the linking to occur. Does anyone think that might work? Or not work?
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