Playing raw uncompressed interlaced RFC 4175 RTP streams
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Playing raw uncompressed interlaced RFC 4175 RTP streams
 
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Hi,
I am trying to play a raw, uncompressed, interlaced RTP (RFC 4175) video stream from a camera. I have been using the following to play it with gstreamer: $ gst-launch-1.0 udpsrc address=239.192.1.40 port=5004 buffer-size=100000 ! "application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)RAW, sampling=(string)YCbCr-4:2:2, depth=(string)8, width=(string)720, height=(string)576, colorimetry=(string)BT601-5, payload=(int)97, interlace=(boolean)true" ! rtpvrawdepay ! videoconvert ! autovideosink This resulting image showed two almost identical images laid out vertically. I recorded a short video showing what I am actually seeing that is available from my Dropbox: https://www.dropbox.com/s/656z30dwtgzt6qz/gstreamer_playback.mp4 The output from running the command: Setting pipeline to PAUSED ... Pipeline is live and does not need PREROLL ... Setting pipeline to PLAYING ... New clock: GstSystemClock ERROR: from element /GstPipeline:pipeline0/GstAutoVideoSink:autovideosink0/GstD3DVideoSink:autovideosink0-actual-sink-d3dvideo: Output window was closed Additional debug info: d3dhelpers.c(1862): d3d_render_buffer (): /GstPipeline:pipeline0/GstAutoVideoSink:autovideosink0/GstD3DVideoSink:autovideosink0-actual-sink-d3dvideo Execution ended after 0:00:59.558180331 Setting pipeline to PAUSED ... Setting pipeline to READY ... Setting pipeline to NULL ... Freeing pipeline ... The SDP for the stream: v=0 o=- 340496 340496 IN IP4 192.168.204.40 s=Camera 2 c=IN IP4 239.192.1.40/15 t=0 0 m=video 5004 RTP/AVP 97 a=rtpmap:97 raw/90000 a=fmtp:97 sampling=YCbCr-4:2:2; width=720; height=576; depth=8; colorimetry=BT601-5; interlace a=framerate:25 I have also captured the RTP network traffic using Wireshark: https://www.dropbox.com/s/l65o879qf2er3qi/camera_5.pcapng?dl=0 _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
Re: Playing raw uncompressed interlaced RFC 4175 RTP streams
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Hi, Clearly this is not well supported by the depayloader. I haven't read the spec, but it looks like if you have 1 image with the top filled, and the second with the bottom filled. This looks like alternate type of interlacing, which we are working on. Though, I believe the depayloader is trying to create interleaved buffers, which clearly is broken. Best is to file a bug, code in gst-plugins-good/gst/rtp will need to be fixed.
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