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• ffmpeg to lower/fade audio volume of one audio stream when microphone voice detected ?

  11 juin 2021, par Lectos Lacious

  I want to do live audio translation via microphone, to get streamed live vid/audio from Facebook, plug the mic into laptop and do live translation by mixing existing audio stream with one coming from the mic (translation). This is OK, somehow I got this part by using audio filter "amix" and mix two audio streams together into one. Now I want to add more perfection to it, is it possible to (probably is) upon mic voice detection to automatically decrease/fade down 20% volume of input/original audio stream to hear translation (mic audio) more loudly and then when mic action/voice stops for lets say 3-5 seconds the volume of original audio stream fades up/goes up to normal volume... is this too much, i can play with sox or similar ?

  


• RTMP server - without watermarks everything works fine --- with watermark one stream will not work nginx ffmpeg overlay watermark

  10 juin 2021, par Ashley Taylor

  okay so i used the below config and everything works great both youtube and facebook work .

  


  rtmp {
    server {
        listen 1935;
        chunk_size 8192;
        application live {
        record off;
        live on;
        push rtmp://a.rtmp.youtube.com/live2/djfghjkdfhgkjsdfglsjdfhj;
                push rtmp://127.0.0.1:19350/rtmp/453uy4uty8ryt85ty85yt8; (facbook)
                    }
    
        }
    

    }


  


  Now i have tried 2 seprate way to add a water mark (Youtube works fine Every time)
Facebook does not stream at all let alone with a watermark

  


  examples i have tried below

  


  rtmp {
server {
    listen 1935;
    chunk_size 8192;
    application live {
    record off;
    live on;
            exec /bin/ffmpeg  -i rtmp://127.0.0.1:1935/live/$name
             -vf "movie=/etc/nginx/images/logo.png[logo];[0][logo]overlay=0:300"
             -c:v libx264 -f flv rtmp://127.0.0.1:1935/push/$name;
              }

    application push {
    live on;
    push rtmp://a.rtmp.youtube.com/live2/djfghjkdfhgkjsdfglsjdfhj;
            }
   }
}


  


  and another

  


  rtmp {
server {
    listen 1935;
    chunk_size 8192;
    application live {
    record off;
    live on;
            exec /bin/ffmpeg  -i rtmp://127.0.0.1:1935/live/$name
             -vf "movie=/etc/nginx/images/logo.png[logo];[0][logo]overlay=0:300"
             -c:v libx264 -f flv rtmp://127.0.0.1:1935/push/$name;
    
                    exec /bin/ffmpeg  -i rtmp://127.0.0.1:1935/live/$name
             -vf "movie=/etc/nginx/images/logo.png[logo];[0][logo]overlay=0:300"
             -c:v libx264 -f flv rtmp://127.0.0.1:1935/pushh/$name;
            }

    application push {
    live on;
    push rtmp://a.rtmp.youtube.com/live2/djfghjkdfhgkjsdfglsjdfhj;
            }

            application pushh {
            live on;
            push rtmp://127.0.0.1:19350/rtmp/453uy4uty8ryt85ty85yt8;
            }
   }
}


  


  Now for the life of me i just cannot get my brain to work.
i am very new to rtmp and have tried a dozen other ways before coming here for help.

  


  i know this is going to be something i where i am making such a simple mistake

  


  but on the other hand paying over $49 for restream.io for a shoddy service i just have to learn this for my own servers

  


• PHP FFMPEG match Instagram aspect ratio requirements

  19 mai 2021, par Linesofcode

  As stated here, the Instagram API requirements to upload a video are :

  


  - Picture size
- - Maximum columns (horizontal pixels): 1920
- - Minimum aspect ratio [cols / rows]: 4 / 5
- - Maximum aspect ratio [cols / rows]: 16 / 9


  


  I'm having some problems figuring it out if the aspect ratio matches. I grab the width and height of the video like this :

  


  $ffprobe = \FFMpeg\FFProbe::create();
$video = $ffprobe->streams($file)->videos()->first();
$width = $video->get('width');
$height = $video->get('height');


  


  And then I know the ratio by dividing the width by height.

  


  The Instagram requirements about Portrait & Landscape videos are :

  


  Portrait - min: 0.8 ; max: 0.99
Landscape - min: 1.01 ; max: 1.78


  


  So why does a video of 848x480 (aspect ratio of 1.76) fails to upload to Instagram by returning "The video format is not supported" and how can I be completely sure that the aspect ratio matches the requirements before trying to upload ?

  


  Edit

  


  The full validation of Instagram requirements :

  


  $video = $ffprobe->streams($file)->videos()->first();
$audio = $ffprobe->streams($file)->audios()->first();
$codec = $video->get('codec_name');
$frameRate = eval('return ' . $video->get('avg_frame_rate') . ';'); // 30/1 -> 30
$width = $video->get('width');
$height = $video->get('height');
$duration = $video->get('duration');

$ratio = round($width / $height, 3);

// Portrait
if ($width < $height)
    if ($ratio < 0.8 || $ratio > 0.99)
        return false;
        
// Landscape
if ($width > $height)
    if ($ratio < 1.01 || $ratio > 1.78)
        return false;


if (!in_array($codec, ['h264', 'hevc']))
    return false;

if ($frameRate < 23 || $frameRate > 60)
    return false;

if ($width > 1920)
    return false;

if ($duration < 3 || $duration > 60)
    return false;

if ($audio)
{
    $aCodec = $audio->get('codec_name');

    if ($aCodec != 'aac')
        return false;
}

return true;


  


  Sample not uploading into Instagram :