Recherche avancée

Sur d’autres sites (6488)

• Issues mapping multiple Axis RTSP streams using FFMPEG

  26 juin 2017, par Alex R

  I have an application built in C# that leverages FFMPEG to map 3 h264 RTSP streams from Axis cameras along with a gdigrab screen recording and saves everything to a file using this command :

   -rtsp_transport tcp -i rtsp://192.168.1.200/axis-media/media.amp -rtsp_transport tcp -i rtsp://192.168.2.200/axis-media/media.amp -rtsp_transport tcp -i rtsp://192.168.3.200/axis-media/media.amp -r 30 -f gdigrab -framerate 1 -i title="MainWindow"  -c copy -map 0 -vcodec copy -map 1 -metadata title="6-26-2017-4-22-PM- TEST VIDEO" -vcodec copy -map 2 -vcodec copy -map 3 -vcodec h264 -preset ultrafast C:\Users\*USERNAME*\6-26-2017-4-22-PM-cam1comb.mkv

  The issue that I’m having is that the Axis camera streams are out of sync with each other, with approximately a 3 second delay between the three streams. When I test the FFMPEG command with all inputs changed to this stream rtsp://mpv.cdn3.bigCDN.com:554/bigCDN/_definst_/mp4:bigbuckbunnyiphone_400.mp4 as well as the screen grab however, everything works perfectly.

• swscale : fix gbrap16 alpha channel issues

  3 août 2017, par James Cowgill

  swscale : fix gbrap16 alpha channel issues
  Fixes filter-pixfmts-scale test failing on big-endian systems due to
  
  alpSrc not being cast to (const int32_t**).
  Also fixes distortions in the output alpha channel values by copying the
  
  alpha channel code from the rgba64 case found elsewhere in output.c.
  Fixes ticket 6555.
  Signed-off-by : James Cowgill <James.Cowgill@imgtec.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libswscale/output.c
  • [DH] tests/ref/fate/filter-pixfmts-scale

• Issues in executing FFmpeg command in Java code in Linux

  12 août 2017, par Tina J

  I have problems executing this ffmpeg command in my java code :

  ffmpeg -i sample.mp4 -i ad.mp4 -filter_complex "[0:v]trim=0:15,setpts=PTS-STARTPTS[v0]; [1:v]trim=0:5,setpts=PTS-STARTPTS[v1]; [0:v]trim=20:30,setpts=PTS-STARTPTS[v2]; [v0][v1][v2]concat=n=3:v=1:a=0[out]" -map "[out]" output.mp4

  I used the getRuntime() method below, but that doesn’t work for me. Even if I simply remove the ", still it doesn’t work. When I simply copy-paste the equivalent string in terminal, it works.

  String c1=" -i "+dir+"sample.mp4 "+"-i "+dir+"ad.mp4 -fi‌​lter_complex [0:v]‌​trim=0:15,setpts=PTS‌​-STARTPTS[v0]; [1:v]trim=0:5,setpts=PTS-STARTPTS[v1]; [0:v]trim=20:30,setpts=PTS-STARTPTS[v2]; [v0][v1][v2]concat=n=3:v=1:a=0[out] -map [out] "+dir+"output.‌​mp4";
  
  RunCommand("ffmpeg"+c1);

  Using this method :

  private static void RunCommand(String command) throws InterruptedException {
  
      try {
  
          // Execute command
  
          Process proc = Runtime.getRuntime().exec(command);
  
          System.out.println(proc.exitValue());
  
  
  
          // Get output stream to write from it
  
          // Read the output
  
  
  
          BufferedReader reader =  
  
                  new BufferedReader(new InputStreamReader(proc.getInputStream()));
  
          String line = "";
  
          while((line = reader.readLine()) != null) {
  
              System.out.print(line + "\n");
  
              //              System.out.println(ads.get(0));
  
          }
  
          proc.waitFor();  
  
  
  
      } catch (IOException e) {
  
      }
  
  }

  This one doesn’t work also, and printing the exit value shows this :

  Exception in thread "main" java.lang.IllegalThreadStateException: process hasn't exited
  
      at java.lang.UNIXProcess.exitValue(UNIXProcess.java:423)
  
      at parser.Parser.RunCommand(Parser.java:106)
  
      at parser.Parser.commandGenerator2(Parser.java:79)
  
      at parser.Parser.main(Parser.java:44)

  If I move the proc.waitFor(); before printing the exit value, it is 1.

  What is the problem ? Why it doesn’t run in Java code ?