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• Error while displaying RTP stream packets from udp port on Gstreamer

  20 octobre 2015, par Gaurav Singla

  I am streaming a live webcam using VLC to darwin streaming server.

  Then tried to play this live web cam feed on RTSP client using following

  GST_DEBUG=2 gst-launch -vvv playbin uri=rtsp ://172.19.91.21/channel.sdp

  Everthing works fine. output is coming on gstreamer window.

  I have reflect all the packest from DSS to RTSP client as well as on a udp_port. But when i tried to play RTP stream using following command

  GST_DEBUG=2 gst-launch-0.10 -vvv udpsrc port=5000 multicast-iface="lo" multicast-group="172.19.91.20" buffer-size=1000000 caps="application/x-rtp, media=video, clock-rate=90000, encoding-name=H264" do-timestamp=false ! rtph264depay ! decodebin ! autovideosink

  I am getting following errors

  0:00:07.108734201 7874 0x89d2a90 ERROR ffmpeg :0: : non-existing PPS referenced
  0:00:07.108803500 7874 0x89d2a90 ERROR ffmpeg :0: : non-existing PPS 0 referenced
  0:00:07.108824183 7874 0x89d2a90 ERROR ffmpeg :0: : decode_slice_header error
  0:00:07.108840903 7874 0x89d2a90 ERROR ffmpeg :0: : no frame !
  0:00:07.108859244 7874 0x89d2a90 WARN ffmpeg gstffmpegdec.c:2299:gst_ffmpegdec_frame : ffdec_h264 : decoding error (len : -1, have_data : 0)

  Please guide me how to solve this problem.

• FFMPEG picture in picture

  19 février 2016, par Jalyo

  I try to put a portion of video in a video at a certain time.

  Se here’s my command :

  ./ffmpeg-3.0-32bit-static/ffmpeg \
  
  -y \
  
  -i main.mp4 \
  
  -itsoffset -10 \
  
  -i overlay.mp4 \
  
  -filter_complex \
  
  "[1:a] atrim=5:20 [1:a1]; \
  
  [1:a1] adelay=5000|5000 [1:a2]; \
  
  [0:a][1:a2] amix [outa]; \
  
  [1:v] scale=120:-1 [1:v1]; \
  
  [0:v][1:v1] overlay=x=25:y=25:enable='between(t,5,20)'[outv]" \
  
  -map "[outv]" \
  
  -map "[outa]" \
  
  -c:a aac \
  
  -c:v libx264 \
  
  -vb 1000k \
  
  -r 24 \
  
  -strict -2 \
  
  output.mp4

  But I’ve got "Buffer queue overflow, dropping" messages which, I think, makes my overlay.mp4 a little jerky on the output.mp4 :

  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.
  
      Last message repeated 50 times
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.0.927x
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.=2.72x
  
      Last message repeated 33 times
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.=2.72x
  
      Last message repeated 14 times
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.=2.97x
  
      Last message repeated 13 times
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.=3.16x
  
      Last message repeated 35 times
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.=3.35x
  
      Last message repeated 45 times
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.=3.46x
  
      Last message repeated 5 times

  Any idea why ?

  EDIT : Forgot to say I’ve got the last version of ffmpeg => 3.0.

• Raspberry Pi USB Webcam Stream to Computer using Gstreamer

  17 mars 2016, par James

  I have a fisheye usb webcam attached to a raspberry pi that I’m trying to stream to a computer. I’ve played with ffmpeg and it seems a little laggy beyond 320x240. From what I’ve read people have been happy with gstreamer.

  So I’ve tested the usb webcam and it works locally

  gst-launch-1.0 -v v4l2src device=/dev/video0 ! 'video/x-raw,width=640,height=480' ! glimagesink

  These are the commands I’ve been trying to use to get the video to my computer. However, all I’m seeing is a green window.

  TCP Sever :gst-launch-1.0 -v v4l2src device=/dev/video0 ! 'video/x-raw,width=640,height=480,framerate=30/1' ! x264enc byte-stream=true ! rtph264pay ! gdppay ! tcpserversink host=192.168.200.38 port=5000 sync=false

  TCP Client : gst-launch-1.0 -v tcpclientsrc host=192.168.200.38 port=5000  ! gdpdepay !  rtph264depay ! avdec_h264 ! videoconvert ! autovideosink sync=false

  or

  UDP Server :
  gst-launch-1.0 -v v4l2src device=/dev/video0 ! 'video/x-raw,width=640,height=480,framerate=30/1' ! x264enc byte-stream=true  ! rtph264pay ! gdppay ! udpsink host=192.168.200.37 port=5000 sync=false

  UDP Client :
  gst-launch-1.0 -v udpsrc port=5000  ! gdpdepay !  rtph264depay ! avdec_h264 ! videoconvert ! autovideosink sync=false

  I figure I must be piping the plugins wrong somehow. Any advice is appreciated.