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• dashenc : check pts to prevent division by zero error

  30 janvier 2020, par Alfred E. Heggestad

  dashenc : check pts to prevent division by zero error
  this usecase will cause a division by zero trap :
  1. dashenc has received one frame
  
  2. os->max_pts and os->start_pts have same value
  
  3. delta between max_pts and start_pts is 0
  
  4. av_rescale_q(0, x, y) returns 0
  
  5. this value is used as denominator in division
  
  6. Bang ! -> segfault
  this fix checks that max_pts > start_pts.
  
  the fix has been tested and works.
  Signed-off-by : Alfred E. Heggestad <alfred.heggestad@gmail.com>
  
  Reviewed-by : Jeyapal, Karthick <kjeyapal@akamai.com>
  
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavformat/dashenc.c

• Stream map '0:a:0' matches no streams

  6 décembre 2019, par Сергей Барахтенко

  To encode a video using FFMPEG the following command is used :

  /usr/bin/ffmpeg -i INPUT.MP4 
  
  -preset veryfast -r 25 -g 75 -threads 4 -sc_threshold 0 
  
  -map 0:v:0 -map 0:a:0 
  
  -filter:v:0 scale=h=240:w=-2  
  
  -minrate:v:0 75k  
  
  -maxrate:v:0 218k  
  
  -bufsize:v:0 300k 
  
  -b:v:0 150k  -c:a aac -b:a 128k -ac 2 
  
  -var_stream_map "v:0,a:0" 
  
  -master_pl_name master.m3u8 
  
  -f hls -hls_time 3 -segment_time 6 
  
  -hls_list_size 0 -segment_format mpegts 
  
  -hls_segment_filename /res-%v/segment-%d.ts  OUTPUT.M3U8  1> log.txt 2>&1 

  In general, despite such a huge command, it copes with the task with a bang

  But there is one little BUT :

  If you run this command on a video WITHOUT audio, there will be an error :

  Stream map '0:a:0' matches no streams. To ignore this, add a trailing '?' to the map.

  Yes, I understand that the command tells me that the audio stream was not found. And to ignore this, you need to add a trailing question mark to the map

  But only I can’t understand where ? to which place ?

  I will be glad to any advice or suggestion

  Thanks in advance

• How to Configure nginx with stunnel to accept parameters for different FB Live Streams OR rtmps with FFMPEG

  15 septembre 2020, par Yogesh Agarwal

  I want to setup RTMPS and learned that only way around is by using nginx and stunnel. I have the setup and it works with just one configured key.

  



  I have several different keys and all are dynamic. A lot of different urls too.

  



  My Goal is to add a parameter or some way by which i can send the custom url to nginx and it can send to Stunnel, and it can read the custom url and forward the encrypted stream to that url.

  



  I am able to get everything done right via ngnix and stunnel but with preconfigured key only - But i want Dynamic key here.. just like a parameter where you can simply plug and send the stream.

  



  I even tried to set this way.

  



  push rtmp ://127.0.0.1:19350/rtmp/ ;

  



  so i can simple forward the stream to rtmp ://127.0.0.1:19350/rtmp/my-key and it takes my-key and forward the stream via stunnel to facebook. but i cannot get it work.

  



  I am about to bang my heads in walls. Kindly give me some pointers.. I am not sure how to do it via ffmpeg as it says it cannot find rtmps protocol.

  



  My Nginx Config :

  



  # RTMP configuration
rtmp {
    server {
        listen 1935; # Listen on standard RTMP port
        chunk_size 4000;
 # This application is to accept incoming stream
        application live {


                live on; # Allows live input from above
                exec_push rtmp://127.0.0.1:19350/rtmp/$name;
                allow play 127.0.0.1;
                dash on;
                dash_path /var/tmp/dashme;

                hls on; # Enable HTTP Live Streaming
                hls_cleanup on;
                hls_sync 100ms;
                hls_fragment 2s;
                hls_path /var/tmp/live/;


        }


  



  and My Stunnel Config :

  



  setuid = nobody
setgid = nobody
pid=/tmp/stunnel.pid
output = /var/log/stunnel.log
;include = /etc/stunnel/conf.d

[fb-live]
client = yes
accept = 127.0.0.1:19350
connect = live-api-s.facebook.com:443
;verifyChain = no