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• Low latency video shared in local gigabit network using linux [on hold]

  6 mai 2017, par user3387542

  For a robotics task we need to share the video (Webcam) live to about 6 or 7 users in the same room. OpenCV will be used on the clients to read the situation and send new tasks to the robots. Latency should not be much more than one second, the lower the better. What commands would you recommend for this ?

  We have one camera on a Linux host which wants to share the video to about 6 other units just some meters away.

  I already experimented with different setups. While raw-video looks like perfectly latency free (local loopback, the issue is the amount of data), any compression suddenly ads about a second delay.
  And how should we share this in the network. Is broadcasting the right approach ? How can it be so hard, they are right next to each other.

  Works locally, issues over the network.

  #server
  
  ffmpeg -f video4linux2 -r 10 -s 1280x720 -i /dev/video0 -c:v libx264 -preset veryfast -tune zerolatency -pix_fmt yuv420p -f mpegts - | socat - udp-sendto:192.168.0.255:12345,broadcast
  
  #client
  
  socat -u udp-recv:12345,reuseaddr - | vlc --live-caching=0 --network-caching=0 --file-caching=0 -

  raw video - perfectly fine like this, video with many artefacts if sent over the network

  ffmpeg -f video4linux2 -r 10 -s 1280x720 -i /dev/video0 -c:v rawvideo -f rawvideo -pix_fmt yuv420p - | vlc --demux rawvideo --rawvid-fps 10 --rawvid-width 1280 --rawvid-height 720 --rawvid-chroma I420 -

  The technology used doesen’t matter, we do not care about network load either. Just want to use opencv on different clients using live data.

• Can not copy RTSP streamed video in android using FFMPEG [on hold]

  28 mars 2017, par user711457

  I am developing an android application. In my application I wanted to record live streamed video using ffmpeg library. I write one code for record live streamed video but it does’t work. It shows some error. If any one know this please help me.

  This is the code I am used to record video

  try {
  
  
  
          fFmpeg.execute(new String[]{"ffmpeg -i rtsp://192.168.1.1:6667/streamhd -acodec copy -vcode c copy"+String.valueOf(getCacheDir())+"/MyVideo.mp4"}, new ExecuteBinaryResponseHandler() {
  
  
  
              @Override
  
              public void onSuccess(String message) {
  
                  Log.d("fffffff", "FFmpeg cmd success");
  
              }
  
  
  
              @Override
  
              public void onFailure(String message) {
  
                  Log.d("ffffffffffff", message.toString());
  
              }
  
          });
  
      }catch (FFmpegCommandAlreadyRunningException e) {
  
          // Handle if FFmpeg is already running
  
          e.printStackTrace();
  
          Log.w(null,e.toString());}

  when I execute this block I get the following error message.

  03-27 12:48:47.109 2042-2042/com.steelmanpro.wifivideoscope D/ffffffffffff: ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
  
                                                                        built with gcc 4.8 (GCC)
  
  
  
  
  
  configuration: --target-os=linux --cross-    prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
  
  
  
                                                                        libavutil      55. 17.103 / 55. 17.103
  
                                                                        libavcodec     57. 24.102 / 57. 24.102
  
                                                                        libavformat    57. 25.100 / 57. 25.100
  
                                                                        libavdevice    57.  0.101 / 57.  0.101
  
                                                                        libavfilter     6. 31.100 /  6. 31.100
  
                                                                        libswscale      4.  0.100 /  4.  0.100
  
                                                                        libswresample   2.  0.101 /  2.  0.101
  
                                                                        libpostproc    54.  0.100 / 54.  0.100
  
                                                                      Output #0, mp4, to 'ffmpeg -i rtsp://192.168.1.1:6667/streamhd -acodec copy -vcode c copy/data/data/com.steelmanpro.wifivideoscope/cache/MyVideo.mp4':
  
                                                                      Output file #0 does not contain any stream

• Is it possible for Nginx rtmp server to receive RTSP and convert it to RTMP stream using ffmpeg ? [on hold]

  11 février 2017, par Jun Kim

  I want to stream live video and audio from android built-in camera to nginx rtmp server to publish it to multiple clients.

  From this open source api https://github.com/fyhertz/libstreaming-examples, I successfully implemented example 3, which streams live video and audio using rtsp to wowza media server. It works fine.

  In order to implement it with nginx rtmp server instead of wowza media server, I read some comments saying that I could convert RTSP live stream to RTMP by using ffmpeg in nginx.conf file. However, it doesn’t seem to work.

  Below ffmpeg command is what i put in nginx.conf file.
  "ffmpeg -rtsp_transport rtp -i "rtsp url" -vcodec copy -f flv -r 25 -s 1920x1080 "rtmp url" (since libstreaming streams camera using rtp over udp)

  Does anybody know if it is possible for nginx media server to receive RTSP from android and convert it to RTMP stream and publish it to multiple clients ?

  If it is impossible, should I use different api that helps streaming live content over RTMP from android phone to nginx rtmp server, such as JacaCV ?
  (https://github.com/bytedeco/javacv)