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• Nginx + rtmp + ffmpeg best practice to publish multiple resolutions streaming from video file

  7 novembre 2019, par youssef hamdane

  I want to make livestream from video file to multiple resolutions (480,720) using nginx and rtmp, what is the best practice that I can do for that :

  1 - transcode video and store it with all resolutions that I need when user upload it using ffmpeg, and then publish every file directly

  example :

  rtmp {
  
      server {
  
          listen 1935;
  
          notify_method get;
  
  
  
          application live {
  
              live on; 
  
              ffmpeg -re -i /path/video_720.mp4
  
             -re -i /path/video_480.mp4
  
             -map 0 vcodec libx264 -threads 0 -vprofile baseline -acodec aac -strict -2 -f flv rtmp://localhost:1935/show/${name}_720
  
             -map 0 vcodec libx264 -threads 0 -vprofile baseline -acodec aac -strict -2 -f flv rtmp://localhost:1935/show/${name}_480
  
          }
  
  
  
         application show {
  
  
  
              live on;
  
  
  
              hls on;
  
              hls_path /stream/live/hls;
  
              hls_nested on;
  
              record off;
  
  
  
              # Instruct clients to adjust resolution according to bandwidth
  
  
  
              hls_variant _720 BANDWIDTH=2048000; # High bitrate, HD 720p resolution
  
              hls_variant _480 BANDWIDTH=448000; # Medium bitrate, SD resolution
  
  
  
          }
  
  
  
      }
  
  }

  2 - keep original video and publish it on different resolutions with ffmpeg

  example :

  rtmp {
  
      server {
  
          listen 1935;
  
          notify_method get;
  
  
  
          application live {
  
              live on;     
  
  
  
              exec_pull ffmpeg -re -i http://server_ip/$app/$name -vcodec libx264 -threads 0 -vprofile baseline -acodec aac -strict -2 -b:v 1920k -b:a 128k -vf "scale=1280:trunc(ow/a/2)*2" -f flv rtmp://localhost:1935/show/${name}_720 
  
              -vcodec libx264 -threads 0 -vprofile baseline -acodec aac -strict -2 -b:v 1024k -b:a 128k -vf "scale=854:trunc(ow/a/2)*2" -f flv rtmp://localhost:1935/show/${name}_480;
  
          }
  
  
  
         application show {
  
  
  
              live on;
  
  
  
              hls on;
  
              hls_path /home/stream/live/hls;
  
              hls_nested on;
  
              record off;
  
  
  
              # Instruct clients to adjust resolution according to bandwidth
  
  
  
              hls_variant _720 BANDWIDTH=2048000; # High bitrate, HD 720p resolution
  
              hls_variant _480 BANDWIDTH=448000; # Medium bitrate, SD resolution
  
  
  
          }
  
  
  
      }
  
  }

• FFMPEG command is not Working when set project's target SDK version 29(Android Q issue)

  1er juin 2020, par SAVALIYA REENA

  I am using the FFMPEG library to get a watermark stamp on video. It is working like charm in all versions when my project's target SDK version is 28 but when i set target sdk version 29, It gives me below exception.

  



  E/FFmpeg : Exception while trying to run : [Ljava.lang.java.io.IOException : Cannot "/data/user/0/com.videowatermark.addtextandtimestampongalleryvideos/files/ffmpeg" : error=13, Permission denied

  



  Caused by : java.io.IOException : error=13, Permission denied at java.lang.UNIXProcess.forkAndExec(Native Method) at java.lang.UNIXProcess.(UNIXProcess.java:133) at java.lang.ProcessImpl.start(ProcessImpl.java:141) at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029) at java.lang.Runtime.exec(Runtime.java:698) at java.lang.Runtime.exec(Runtime.java:563) at com.github.hiteshsondhi88.libffmpeg.ShellCommand.run(ShellCommand.java:10) at com.github.hiteshsondhi88.libffmpeg.FFmpegExecuteAsyncTask.doInBackground(FFmpegExecuteAsyncTask.java:38) at com.github.hiteshsondhi88.libffmpeg.FFmpegExecuteAsyncTask.doInBackground(FFmpegExecuteAsyncTask.java:10) at android.os.AsyncTask$3.call(AsyncTask.java:378) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:289) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641) at java.lang.Thread.run(Thread.java:919)

  



  //show this error

  


• Cannot Register my dll using regsrv32 but only with Release build, Debug build works ok

  4 février 2020, par kirit

  I am having same problem as this question.

  I have my own Dlls that uses ffmpeg (Ver 0.6.3) dlls (AVCODEC-52.dll, AVFormat-52.dll,.. all build under MinGW using mingw-get-inst-20110530) ..
  I have the dlls and libs in my VC2008 project and it all builds ok in both debug and release mode and also runs ok... but if i try to register using regsvr32 it errors out for release Only (Debug works ok).
  Checking my dll using dependence walker tool shows that this dlls are of readish color and shows CoCreateInstance, CoInitialize ...(i think this are part of old32.dll) are missing..

  Based on the above link looks like some kind of build issue with ffmpeg under minGW.. but details of the solutions is missing.. any help or suggestion are well come.