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• avutil/mips : refactor msa SLDI_Bn_0 and SLDI_Bn macros.

  6 août 2019, par gxw

  avutil/mips : refactor msa SLDI_Bn_0 and SLDI_Bn macros.
  Changing details as following :
  
  1. The previous order of parameters are irregular and difficult to
  
     understand. Adjust the order of the parameters according to the
  
     rule : (RTYPE, input registers, input mask/input index/..., output registers).
  
     Most of the existing msa macros follow the rule.
  
  2. Remove the redundant macro SLDI_Bn_0 and use SLDI_Bn instead.
  Reviewed-by : Shiyou Yin <yinshiyou-hf@loongson.cn>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/mips/h264dsp_msa.c
  • [DH] libavcodec/mips/h264qpel_msa.c
  • [DH] libavcodec/mips/hevc_lpf_sao_msa.c
  • [DH] libavcodec/mips/hevcpred_msa.c
  • [DH] libavcodec/mips/hpeldsp_msa.c
  • [DH] libavcodec/mips/me_cmp_msa.c
  • [DH] libavcodec/mips/qpeldsp_msa.c
  • [DH] libavcodec/mips/vp8_mc_msa.c
  • [DH] libavcodec/mips/vp9_idct_msa.c
  • [DH] libavcodec/mips/vp9_lpf_msa.c
  • [DH] libavcodec/mips/vp9_mc_msa.c
  • [DH] libavutil/mips/generic_macros_msa.h

• Reading images from AXIS ip camera using OpenCV

  14 juin 2016, par batuman

  I am trying to access AXIS IP camera from my program using OpenCV.
  My OpenCV version is 3.1. I follow this tutorial link.

  I have all libraries installed.
  My following program can load mp4 video successfully. That means ffmpeg and necessary libraries are working fine.

  #include <iostream>
  
  #include <opencv2></opencv2>opencv.hpp>
  
  
  
  using namespace std;
  
  int main() {
  
      cv::VideoCapture vcap("test.mp4");
  
      cv::Mat image;
  
  //    const string address = "rtsp://root:pass@192.168.0.90/axis-media/media.amp?camera=1";
  
  //    if(!vcap.open(address)){
  
  //      std::cout &lt;&lt; "Error opening video stream or file " &lt;&lt; std::endl;
  
  //      return -1;
  
  //    }
  
      for(;;){
  
          if(!vcap.read(image)){
  
              std::cout &lt;&lt; "No frame" &lt;&lt; std::endl;
  
              cv::waitKey(0);
  
          }
  
          cv::imshow("Display", image);
  
          cv::waitKey(1);
  
      }
  
      return 0;
  
  }
  
  </iostream>

  When I tried to access the IP Camera as follow

  cv::VideoCapture vcap("rtsp://root:pass@192.168.0.90/axis-media/media.amp?camera=1");

  I have the following error

  GStreamer Plugin: Embedded video playback halted; module source reported: Could 
  
  not open resource for reading and writing.
  
  OpenCV Error: Unspecified error (GStreamer: unable to start pipeline
  
  ) in cvCaptureFromCAM_GStreamer, file /home/Softwares/opencv/opencv/modules
  
  /videoio/src/cap_gstreamer.cpp, line 818
  
  terminate called after throwing an instance of 'cv::Exception'
  
    what():  /home/Softwares/opencv/opencv/modules/videoio/src/cap_gstreamer.
  
  cpp:818: error: (-2) GStreamer: unable to start pipeline
  
   in function cvCaptureFromCAM_GStreamer

  User is root and password is pass and ip 192.168.0.90 are all defaults.

  My if config gave me

  ifconfig
  
  eth0      Link encap:Ethernet  HWaddr b8:2a:72:c6:b8:13  
  
            inet6 addr: fe80::ba2a:72ff:fec6:b813/64 Scope:Link
  
            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
  
            RX packets:723959 errors:0 dropped:0 overruns:0 frame:0
  
            TX packets:116637 errors:0 dropped:0 overruns:0 carrier:0
  
            collisions:0 txqueuelen:1000 
  
            RX bytes:199422245 (199.4 MB)  TX bytes:13701699 (13.7 MB)
  
  
  
  lo        Link encap:Local Loopback  
  
            inet addr:127.0.0.1  Mask:255.0.0.0
  
            inet6 addr: ::1/128 Scope:Host
  
            UP LOOPBACK RUNNING  MTU:65536  Metric:1
  
            RX packets:24829 errors:0 dropped:0 overruns:0 frame:0
  
            TX packets:24829 errors:0 dropped:0 overruns:0 carrier:0
  
            collisions:0 txqueuelen:0 
  
            RX bytes:2502903 (2.5 MB)  TX bytes:2502903 (2.5 MB)
  
  
  
  wlan0     Link encap:Ethernet  HWaddr a0:a8:cd:99:92:60  
  
            UP BROADCAST MULTICAST  MTU:1500  Metric:1
  
            RX packets:0 errors:0 dropped:0 overruns:0 frame:0
  
            TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
  
            collisions:0 txqueuelen:1000 
  
            RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

  What could be the problem for this access to the camera ?

  Thanks

• ffmpeg - rendering images and sound into video with transparent background

  22 septembre 2013, par Adam

  I got lots of images and a sound file.

  I want to convert all these images into a video (with the wav file as the sound of the movie).
  The images have a transparent background and I want the movie's background to be transparent too.

  How do I tell ffmpeg to render with a transparent background ?

  P.S - I keep getting the following error :

  Error while opening encoder for output stream #255:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  Sincerely,

  Adam.