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• ffmpeg : prevent premature EOF in sub2video with nullptr AVSubtitles

  31 mars 2018, par Jan Ekström

  ffmpeg : prevent premature EOF in sub2video with nullptr AVSubtitles
  With certain types of input and the filter chain getting re-initialized
  
  or re-configured, multiple nullptr AVSubtitles can get pushed into
  
  sub2video_update() in a row from sub2video_heartbeat.
  This causes end_pts, and on the next round pts, to become INT64_MAX,
  
  latter of which signals EOF in framesync, leading to complete loss of
  
  subtitles from that point on.
  Thus, check that the sub2video.end_pts is smaller than INT64_MAX
  
  in a similar fashion to sub2video_flush before sending out the
  
  nullptr AVSubtitle. This keeps premature EOFs from happening in
  
  framesync and the subtitle overlay is kept past the filter chain
  
  re-initializations/configurations.
  

  • [DH] fftools/ffmpeg.c

• How to open a HEIF (.heic) image ?

  14 décembre 2022, par Jean-Milost Reymond

  For a c++ project, I need to open and show a HEIF (.heic) image. What I know (if I'm right) is that the HEIF images are based on the ffmpeg standard, and requires a H265 codec to be read.

  



  I found several open-source H265 codecs :

  



  

  • OpenHEVC (https://github.com/OpenHEVC/openHEVC)

  


  • x265 (https://bitbucket.org/multicoreware/x265/downloads/)

  


  • libde265 (https://github.com/strukturag/libde265)

  


  



  I can open and show H265 encoded video files with each of them, but I'm unable to simply open, show or convert a .heic image. All of them return an error, or just do nothing.

  



  To be honest I'm a little puzzled, because the HEIF standard seem to be a well kept secret. I'm unable to find a relevant info that could allow me to walk to a solution. Those I found are just tricks and workarounds, like e.g. forcing the device (I'm speaking here about the Apple iPhone using the new iOS11) to generate a jpg image instead of a heic, or using a third party application like dr.fone. Of course these solutions are irrelevant for me.

  



  So, somebody can tell me which codec I should use with a .heif image, and how I can use it to open it ? Or are there open source libraries or examples that allow to manipulate this type of image file ? Somebody can point me to the good direction ?

  


• exec RTMP stream to HLS nginx server not working

  26 février 2019, par Serg Port

  I’m trying to convert an RMTP stream to HLS using ffmpeg in an nginx server
  This is my basic nginx configuration.
  If use push rtmp ://localhost/show/ instead of exec is saving data, but exec it’s not doing nothing.
  I can see the stream with ffplay,
  error —> RTMP_ReadPacket, failed to read RTMP packet header
  rtmp ://localhost/live/key : Invalid data found when processing input
  To test it I’m using OBS and ffplay

  #user  root;
  
  worker_processes  auto;
  
  
  
  
  
  events {
  
      worker_connections  1024;
  
  }
  
  
  
  
  
  # 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
  
  
  
              # Once receive stream, transcode for adaptive streaming
  
              exec ffmpeg -i rtmp://localhost/$app/$name -async 1 -vsync -1 -c:v libx264 -c:a libvo_aacenc -b:v 256k -b:a 32k -vf "scale=480:trunc(ow/a/2)*2" -tune zerolatency -preset veryfast -crf 23 -f flv rtmp://localhost/show/$name_low 2>>/tmp/ffmpeg.error; 
  
          }
  
  
  
          # This application is for splitting the stream into HLS fragments
  
          application show {
  
              live on; # Allows live input from above
  
              hls on; # Enable HTTP Live Streaming
  
  
  
              hls_path /mnt/hls/;
  
  
  
              # Instruct clients to adjust resolution according to bandwidth
  
              hls_variant _low BANDWIDTH=288000; # Low bitrate, sub-SD resolution
  
          }
  
      }
  
  }