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• Use ffmpeg to create a music video with the cover on a black background

  21 septembre 2020, par user6329530

  I am trying to use this tutorial to create youtube videos with ffmpeg
https://trac.ffmpeg.org/wiki/Encode/YouTube

  


  When using this example, I get a video that works however the background is white

  


  ffmpeg -loop 1 -framerate 2 -i albumcover.png -i audio.wav -c:v libx264 -preset medium -tune stillimage -crf 18 -c:a copy -shortest -pix_fmt yuv420p output.mkv


  


  I tried to add a color filter but that makes the whole video output black :

  


  ffmpeg -loop 1 -framerate 2 -i albumcover.png -filter_complex "color=s=1920x1080:c=black" -i audio.wav -c:v libx264 -preset medium -tune stillimage -crf 18 -c:a copy -shortest -pix_fmt yuv420p output.mkv


  


  I find it very difficult to find something about this on the internet as most ask for just a black video or a transparent background for a gif ect.

  


  So how do I get the albumcover.png on a black background ?

  


  EDIT : I just realized that the video format is of course the image format (square) and therefore it's white on youtube. The question therefore is now how do I create a black background 16:9 and put the albumcover centered on it...

  


• Problem when adding background music to video without sound

  27 avril 2020, par Nguyễn Trọng

  I am trying to cut a piece of background music and loop them into a video and change the speed of the video with the command below.

  



   String[] cmd = {"-y", "-i", input, "-i", shortsound,
            "-filter_complex",
            "[0:v]trim=0:120,setpts=1/2*(PTS-STARTPTS)[v1]," +
                    "[0:v]trim=120:240,setpts=1/2*(PTS-STARTPTS)[v2];" +
                    "[1:a]atrim=0:6,asetpts=PTS-STARTPTS," +
                    "asetrate=44100,aloop=-1:2e+09," +
                    "aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=1.0[bg];" +
                    "[0:a]atrim=0:120,asetpts=PTS-STARTPTS,atempo=2.0" +
                    ",aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo[a1]," +
                    "[0:a]atrim=120:240,asetpts=PTS-STARTPTS,atempo=2.0," +
                    "aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo[a2];" +
                    "[v1][a1][v2][a2]concat=n=2:v=1:a=1[video][audio];[audio]volume=0.5[avolume];" +
                    "[avolume][bg]amerge=2,pan=stereo|c0code>

  



  Everything was fine until I tried with a video without sound, it didn't work.
How when input is a video without sound ?

  


• I am streaming mp3 music via ffmpeg to a local rtmp server then converting to hls, but am having difficulties end to end testing

  12 avril 2020, par SquirrelSenpai

  I am streaming mp3 music via ffmpeg to a local rtmp server then converting to hls, but am having difficulties end to end testing. I am know test.m3u8 playlist should be produce, however I am unable to check inside /nginx/hls/ as it is locked by www-data during operation. I have tried multiple permutation of what I thought the output hls stream would be in vlc with no luck. localhost:8080/live/test.m3u8, localhost:8080/hls/test.m3u8

  



  Any tips on effective testing would be much appreciated.

  



  Technologies involved :

  



  

  • FFMPEG

  


  • NGINX (This and the below 3 are part of a module)

  


  • HLS

  


  • RTMP

  


  



  Working :

  



  ffmpeg -hide_banner -i http://149.255.59.164:8138 -f mp3 test.mp3


  



  Seemingly working, correctly reads files, shows conversion of some kind
  
size= 362kB time=00:00:23.09 bitrate= 128.3kbits/s speed=3.21x

  



  fmpeg -hide_banner -i http://x.x.x.x:8138 -f mp3 rtmp://localhost:1935/live/test


  



  Nginx.conf

  



  user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;

events {
        worker_connections 768;
        # multi_accept on;
}

rtmp_auto_push on;

rtmp{

        server{

                listen 1935;

                chunk_size 4000;

                #one publisher, many subscribers

                application live {

                        # enable live streaming
                        live on;
                        record off;

                        # publish only from localhost
                        allow publish 127.0.0.1;
                        deny publish all;

                        # hls - required for web browser consumption
                        hls on;
                        hls_path /tmp/hls;
                        hls_fragment 3;
                        hls_playlist_length 60;

                        # disable consuming the streaming from nginx as rtmp
                        deny play all;

                }

        }

}

# HTTP can be used for accessing RTMP stats
http {

    server {

        listen      8080;

        # This URL provides RTMP statistics in XML
        location /stat {
            rtmp_stat all;

            # Use this stylesheet to view XML as web page
            # in browser
            rtmp_stat_stylesheet stat.xsl;
        }

        location /stat.xsl {
            # XML stylesheet to view RTMP stats.
            # Copy stat.xsl wherever you want
            # and put the full directory path here
            root /path/to/stat.xsl/;
        }

        location /hls {
            # Serve HLS fragments
            types {
                application/vnd.apple.mpegurl m3u8;
                video/mp2t ts;
            }
            root /tmp;
            add_header Cache-Control no-cache;
        }

        location /dash {
            # Serve DASH fragments
            root /tmp;
            add_header Cache-Control no-cache;
        }
    }
}