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• Use FFMPEG to blend streaming overlay onto second stream

  31 août 2017, par Louwrens Benade

  I’m trying to build a form of monitoring that can be superimposed onto a live stream.

  Monitor Overlay

  ffmpeg -i rtmp://localhost/pool/livestream -filter_complex \
  
    "nullsrc=1024x576[1:v]; \
  
    [0:a]showvolume=v=0:o=1:t=0:f=0.1,drawbox=x=ih-40:y=0:w=40:h=ih[volume]; \
  
    [1:v]drawtext=x=(main_w/2)-(text_w/2):y=text_h:fontsize=30:fontcolor=white:borderw=1:text='Stream Label',scale=-1:-1[label]; \
  
    [label][volume]overlay=x=main_w-40:y=0[output]" \
  
    -map "[output]" -f flv rtmp://localhost/pool/livestream_overlay

  What I would like to accomplish is that this stream be superimposed onto the original stream and pushed to a third RTMP endpoint, like this :

  ffmpeg -i rtmp://localhost/pool/livestream -i rtmp://localhost/pool/livestream_overlay \
  
    -filter_complex "[0:v][1:v]overlay=shortest=1[output]" \
  
    -f flv rtmp://localhost/pool/livestream_monitor

  While the workflow seems to be working, the overlay is not blending (subtracted ?) onto the original video :

  Actual output

  

  Expected output

  

  Note : codec options have been removed for brevity’s sake.

• Filename in android rejected by ffmpeg command

  28 avril 2020, par ark1974

  Planning to use ffmpeg in Android for A/V conversion. Installed Android Studio 3.5.3. I am fairly new to Android development and the folder names, unlike in windows system, is fairly confusing to me. I am able to build the gradle without any error but the fetched pathname is rejected by ffmpeg commandline.

  



  Questions :

  



  1) Resulting path_name shows both pathname and filename which is cool. Is the resulting path_name correct or expected ? However, ffmpeg raised error flag citing that directory/file do not exist corresponding to the resulting path_name.

  



  2) Inside android properties, the path starts with "Device storage/..." but Android Studio command starts with "/document/". Why I see this variation ?

  



  3) onActivityResult() do not work with @override private prefix but works with @override public, is it expected ? Many examples on internet, however use private though.

  



  4) MediaStore.Audio.Media.DATA code do not work at all, is it deprecated in Android 3.5.5 ?

  



  Java code :

  



  @Override public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if(requestCode == 7 &&  resultCode == RESULT_OK){    
                    path_name = data.getData().getPath();    
        }
    }


  



  Result :

  



  path_name = "/document/primary:WhatsApp/Media/WhatsApp Audio/AUD-20200402-WA0006.mp3" **strong text**


  


• Parlez-Vous Binutils ?

  18 juillet 2010, par Multimedia Mike — General

  I found myself in need of some binutils today. What do you suppose it is about this basic Apache file listing page that makes Google Chrome think it’s in French ?

  
  
  

  Opting to translate doesn’t seem to have any affect, aside from ruining the alignment of the columns.

  That quirk aside, the page translation facility is actually quite nifty.