gst-launch-1.0 multipath specifying problem

[Nicolas Dufresne]

Hi William,

please avoid replying to existing thread for new threads, otherwise you
thread will be ignored.

regards,
Nicolas

Le mercredi 22 avril 2020 à 21:52 -0500, William Johnston a écrit :
> So a fit of setup:
> misbdemux has on input and two outputs
> misbfixcoordinates has two inputs and two outputs
> misbsink has two inputs
> 
> So I need it to fork into two paths at misbdemux, travel through 
> misbfixcoordinate, and end up at misbsink.
> 
> I can test each path independently like so:
> 
> gst-launch-1.0 filesrc location=/home/wgj/video/Truck.H264.ts ! 
> misbdemux name=md ! tsdemux ! h264parse ! avdec_h264 ! videoconvert ! 
> "video/x-raw, format=(string)RGB" ! misbfixcoordinates name=mfc ! 
> misbsink name=ms
> 
> and
> 
> gst-launch-1.0 filesrc location=/home/wgj/video/Truck.H264.ts ! 
> misbdemux name=md ! "meta/klv" ! misbfixcoordinates name=mfc ! misbsink 
> name=ms
> 
> So far so good. However, when I combine them I get a problem. I can 
> combine them in two different ways:
> 
> gst-launch-1.0 filesrc location=/home/wgj/video/Truck.H264.ts ! 
> misbdemux name=md ! tsdemux ! h264parse ! avdec_h264 ! videoconvert ! 
> "video/x-raw, format=(string)RGB" ! misbfixcoordinates name=mfc ! 
> misbsink name=ms         md. ! "meta/klv" ! mfc. ! ms.
> 
> gst-launch-1.0 filesrc location=/home/wgj/video/Truck.H264.ts ! 
> misbdemux name=md ! "meta/klv" ! misbfixcoordinates name=mfc ! misbsink 
> name=ms      md. ! tsdemux ! h264parse ! avdec_h264 ! videoconvert ! 
> "video/x-raw, format=(string)RGB" ! mfc. ! ms.
> 
> Both fail with:
> 
> WARNING: erroneous pipeline: syntax error
> 
> In both cases it's the misbfixcoordinates in the second path (mfc.) 
> seems to be causing the failure.
> 
> By dropping the second misbfixcoordinates I can make it run (though 
> without the behavior that I need):
> 
> gst-launch-1.0 filesrc location=/home/wgj/video/Truck.H264.ts ! 
> misbdemux name=md ! tsdemux ! h264parse ! avdec_h264 ! videoconvert ! 
> "video/x-raw, format=(string)RGB" ! misbfixcoordinates name=mfc ! 
> misbsink name=ms         md. ! "meta/klv" ! ms.
> 
> gst-launch-1.0 filesrc location=/home/wgj/video/Truck.H264.ts ! 
> misbdemux name=md ! "meta/klv" ! misbfixcoordinates name=mfc ! misbsink 
> name=ms       md. ! tsdemux ! h264parse ! avdec_h264 ! videoconvert ! 
> "video/x-raw, format=(string)RGB" ! ms.
> 
> So, I don't think it's anything to do with my misbfixcoordinates plug-in 
> as each path through it works independently and the problem doesn't 
> follow which pair of pads I'm using. It seems that there is a syntax 
> error in how I'm setting up the path. I don't see it though.
> 
> Any ideas? I have been looking at this for two days now and I am no 
> closer to figuring it out.
> 
> 
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