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• ffmpeg with nginx rtmp multiple udp not streaming well

  16 septembre 2017, par Dlniya Dlzar

  I am using ffmpeg for live streaming via nginx rtmp , i am streaming 20 streams for each server (UDP to rtmp) i wrote small python script to loop
  through each streams and run following command for each stream, but each time i start streaming some of the streams not working , i mean ffmpeg not send to nginx , if i use (http to rtmp or rtmp to rtmp etc) everything is working fine just when i use (udp to rtmp) this problem happen , please advice . sorry for bad English : this is my command

  ffmpeg -i udp://localhost:3000 -filter_complex 
  
  [0]yadif[main];movie=/root/ftc/logo/logo3.png[logo];[main]
  
  [logo]overlay=650:10" -c:a aac -ac 1 -strict -2 -c:v libx264 -maxrate 2000k 
  
  -bufsize 2000k -g 40 -r 23 -preset ultrafast -threads 1 -f flv 
  
  rtmp://localhost:3000/live/stream1 null >/dev/null 
  
  2>/var/log/ffmpeg.log &

• ffmpeg - Stream media file with alpha channel

  14 décembre 2018, par cub33

  What I would like to achieve is to stream a PNG image (containing alpha background) to localhost in order to use it as input to watermark the main video stream. For example I have a ffmpeg process that would stream the png :

  ffmpeg -loop 1 -i image_with_alpha_backgroung.png -options options protocol://localhost:3000

  Main ffmpeg process :

  ffmpeg -i main_video -i protocol://localhost:3000 -filter_complex overlay -f flv rtmp://streaming_server

  The main ffmpeg process would listen for that png watermark stream and would insert it only when streamed from the png ffmpeg stream process. How is it achievable ? What I have tried is to stream the png with image2pipe format but it transforms the images in mjpeg and also tried to stream .webm files since the vp9 codec supports alpha but when receiving the webm stream the main process doesn’t like the input format. Thank you for your attention

• How to add multiple audio to a video at specific time for specific duration

  14 février 2021, par Javed Saifi

  I have a video.mp4 file of 20 seconds without audio stream, and I have 2 audio files audio1.mp3 and audio2.mp3. What I want is audio1 should start playe at 3 seconds for 5 seconds, and audio 2 should start play at 10 seconds for 6 seconds.

  


  ffmpeg -y -i video1.mp4 -i audio1.mp3 -i audio2.mp3 -filter_complex "[1]adelay=3000|3000[aud1];[2]adelay=10000|10000[aud2];[aud1][aud2]amix=2,apad[a];
[0][a]amix=duration=first[a]" -map 0:v -map "[a]" -c:v copy -ac 2 output.mp4


  


  what I'm trying to achieve is the final output will be a 20 seconds video where audio1 will start palying at 3 seconds to 8 seconds and audio2 will start from 10 seconds to 16 seconds.