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• ffmpeg forward stream have 3 seconds delay

  28 janvier 2016, par lovedboy

  I am using nginx with module nginx-rtmp-module as a live server.

  here is the sample config.

      application src {
  
          live on;
  
          exec /usr/bin/ffmpeg -re -i rtmp://localhost/src/$name -acodec  copy -vcodec copy -f flv rtmp://localhost/hls/$name
  
      }
  
      application hls {
  
          live on;
  
          hls on;
  
          hls_path /tmp/hls;
  
          hls_fragment 2s;
  
          hls_playlist_length 8s;

  I use ffmpeg forward stream and it has about 3 seconds delay between src channel and hls channel.

  The reason of delay seems to be ffmpeg itself.

  Are there any methods to reduce the delay when using ffmpeg forward stream ?

  Any idea about it ? Thanks.

• FFmpeg First 2 Seconds of Video Not Showing

  18 janvier 2016, par Pamela

  This code works fine for some audio files (makes a slideshow of JPG pictures with a PNG watermark and MP3 audio, while maintaining aspect ratio) but for this audio file, the pictures are not showing for the first two seconds or so of the video :

  ffmpeg -y -framerate 1/12 -i "media/%03d.jpg" -i "media/audio.mp3" -loop 1 -i "media/watermark.png" -filter_complex "[0:v]scale=iw*min(3840/iw\,2160/ih):ih*min(3840/iw\,2160/ih), pad=3840:2160:(3840-iw)/2:(2160-ih)/2[ss]; [ss][2:v] overlay=main_w-overlay_w-10:main_h-overlay_h-10:shortest=1[out]" -map "[out]" -map 1:a -c:v libx264 -r 24 -preset veryfast -tune stillimage -pix_fmt yuv420p -c:a copy -map_metadata -1 "media/video.mkv" -report

  I tried converting the audio into different formats of MP3, tried changing bitrates, changed audio to stereo, and even tried converting it to a WAV. None of these things worked.

  Here are the report results for when I run this command.

  If it makes a difference, I’m using Ubuntu 14.04 and FFmpeg version N-77455-g4707497 (latest version).

• FFMPEG / Melt audio crossfade with cutting last 10 seconds (loop)

  27 mai 2019, par user2455079

  Need to create audio loop with same file to create audio loop for needed time.
  The problem is that at the end of music track starts silence, so need to remove last 10 seconds from file and make crossfade for 3 seconds.

  basically i can cut last 10 seconds ffmpeg -i music.mp3 -t (time-10) -c copy out.mp3 and than run crossfade :

  ffmpeg -i out.mp3 -i out.mp3 -i out.mp3 -vn
  
         -filter_complex "[0][1]acrossfade=d=3:c1=tri:c2=tri[a01];
  
                          [a01][2]acrossfade=d=3:c1=tri:c2=tri"
  
         out.mp3

  Is there any way to do this using single command ?