[gst-devel] caps parsing error in gst.parse_launch

[Stefan Kost]

Florent schrieb:
> Hello,
> 
> I have an issue about caps declaration.
> 
> My project (gst-gengui) is intended to be used in the same fashion as
> gst-launch. In other terms, my app gets all the arguments (argv) and
> concanetes them to form the same string as in command line. Then,
> gst.parse_launch launches the pipeline from the description. The
> problem is that if the string contains some "capsfilter
> caps='video/x-h264...' " there is a caps parsing error.

Please tell us what error you get :)

Stefan

> 
> The only workaround i could find is to specify the caps somewhere
> else, create them and set them as property :
> 1) cap = gst.caps_from_string(caps_string)
> 2) capsfilter.set_property("caps",cap)
> 
> I don't know why, but syntax is different for gst-gengui command line
> usage and in the config file.
> 
> In config file, what works (no double quotes between caps) is
> declaring the description as follows (no quotes, no named capsfilter
> element):
> pipeline_desc = "videotestsrc ! video/x-raw-yuv, format=(fourcc)YUY2,
> width=(int)320, height=(int)240, framerate=(fraction)15/1 !
> ffmpegcolorspace !  videobalance ! queue ! xvimagesink"
> 
> command line equivalent (quotes needed):
> gst-gengui videotestsrc ! "video/x-raw-yuv, format=(fourcc)YUY2,
> width=(int)320, height=(int)240, framerate=(fraction)50/1" ! queue !
> xvimagesink
> 
> whereas gst-launch can work with
> - video/x-raw-rgb
> - "video/x-raw-rgb"
> - capsfilter caps="video/x-raw-rgb"
> 
> I would be happy to find a nicer workaround than parsing the
> description string for caps and setting the caps by hand, or defining
> drastic declaration conventions...
> 
> Regards,
> 
> Florent
> 
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