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• How to decrypt segmented parts .ts files which are encrypted with ffmpeg ?

  3 août 2021, par Yancey

  I use ffmpeg to generate encrypted m3u8 playlists, both generation and playing work perfectly.

  


  The statement I use to generate m3u8 :

  


  ffmpg -i "source.mp4"  -c:v h264_nvenc 
 -sc_threshold 0 -g 48 -keyint_min 48 -hls_time 10 -hls_playlist_type vod
 -hls_key_info_file "d:\enc.keyinfo" -hls_segment_filename "output_$03d.ts" "output.m3u8";


  


  Content of d :\enc.keyinfo :

  


  /enc.key
d:\enc.key
261daad184c6acf4a3a21393ds232e1a


  


  Now I need to decrypt one or more generated .ts segments (not the whole m3u8 playlist), what should I do ?

  


• FFMPEG streaming error : Failed to update header with correct filesize and duration

  9 septembre 2020, par Brindha Kanniah

  I am trying to stream an mp4 to a vlc player on my local computer at ip address 127.0.0.1:48550, but am encountering this error.

  



  Failed to update header with correct duration.
Failed to update header with correct filesize.


  



  I didn't have this problem when streaming on my mac, but am encountering it with a Windows pc.

  



  On my mac I am running ffmpeg 3.2.4, and on the pc, ffmpeg version N-86755-g0780ad9 built with gcc 7.1.0.

  



  Below is the VLC media player debug log :

  



  core debug: adding item `udp://127.0.0.1:48550' ( udp://127.0.0.1:48550 )
core debug: processing request item: udp://127.0.0.1:48550, node: null, skip: 0
core debug: rebuilding array of current - root Playlist
core debug: rebuild done - 1 items, index 0
core debug: starting playback of the new playlist item
core debug: resyncing on udp://127.0.0.1:48550
core debug: udp://127.0.0.1:48550 is at 0
core debug: creating new input thread
core debug: Creating an input for 'udp://127.0.0.1:48550'
core debug: meta ok for (null), need to fetch art
core debug: requesting art for udp://127.0.0.1:48550
core debug: looking for meta fetcher module matching "any": 1 candidates
core debug: using timeshift granularity of 50 MiB, in path 'C:\Users\Oculus\AppData\Local\Temp'
core debug: looking for meta fetcher module matching "any": 1 candidates
core debug: `udp://127.0.0.1:48550' gives access `udp' demux `' path `127.0.0.1:48550'
core debug: specified demux `any'
core debug: creating demux: access='udp' demux='any' location='127.0.0.1:48550' file='\\127.0.0.1:48550'
core debug: looking for access_demux module matching "udp": 12 candidates
core debug: no access_demux modules matched
core debug: creating access 'udp' location='127.0.0.1:48550', path='\\127.0.0.1:48550'
core debug: looking for access module matching "udp": 21 candidates
lua debug: Trying Lua scripts in C:\Users\Oculus\AppData\Roaming\vlc\lua\meta\fetcher
lua debug: Trying Lua scripts in C:\Program Files\VideoLAN\VLC\lua\meta\fetcher
lua debug: Trying Lua scripts in C:\Users\Oculus\AppData\Roaming\vlc\lua\meta\fetcher
lua debug: Trying Lua scripts in C:\Program Files\VideoLAN\VLC\lua\meta\fetcher
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\fetcher\tvrage.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\fetcher\tvrage.luac
udp debug: opening server=127.0.0.1:48550 local=:1234
core debug: net: connecting to [127.0.0.1]:48550 from []:1234
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\fetcher\tvrage.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\fetcher\tvrage.luac
core debug: no meta fetcher modules matched
core debug: searching art for udp://127.0.0.1:48550
core debug: looking for art finder module matching "any": 2 candidates
core debug: no meta fetcher modules matched
core debug: searching art for udp://127.0.0.1:48550
core debug: looking for art finder module matching "any": 2 candidates
lua debug: Trying Lua scripts in C:\Users\Oculus\AppData\Roaming\vlc\lua\meta\art
lua debug: Trying Lua scripts in C:\Users\Oculus\AppData\Roaming\vlc\lua\meta\art
lua debug: Trying Lua scripts in C:\Program Files\VideoLAN\VLC\lua\meta\art
lua debug: Trying Lua scripts in C:\Program Files\VideoLAN\VLC\lua\meta\art
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\00_musicbrainz.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\00_musicbrainz.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\00_musicbrainz.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\00_musicbrainz.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\01_googleimage.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\01_googleimage.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\01_googleimage.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\01_googleimage.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\02_frenchtv.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\02_frenchtv.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\02_frenchtv.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\02_frenchtv.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\03_lastfm.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\03_lastfm.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\03_lastfm.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\03_lastfm.luac
core debug: no art finder modules matched
core debug: art not found for udp://127.0.0.1:48550
core debug: no art finder modules matched
core debug: art not found for udp://127.0.0.1:48550
core debug: using access module "udp"
core debug: Using block method for AStream*
core debug: starting pre-buffering
qt4 debug: IM: Setting an input


  



  Thoughts on why this is happening ? And on how to resolve this ?

  


• Low Latency DASH Nginx RTMP

  3 août 2017, par Kenan Christian

  I use arut nginx-rtmp-module (https://github.com/arut/nginx-rtmp-module) on the media server, then I tried to stream using FFmpeg to the dash application, then I test the stream by playing it using VLC.

  And it waits around 30secs to start playing, and it plays from the beginning, not the current timestamp.

  This is my current config on the RTMP block

  rtmp {
  
      server {
  
          listen 1935;
  
  
  
          application live {
  
              live on;
  
  
  
             exec ffmpeg -re -i rtmp://localhost:1935/live/$name
  
                -c:a libfdk_aac -b:a 32k  -c:v libx264 -b:v 128K -f flv rtmp://localhost:1935/hls/$name_low
  
                -c:a libfdk_aac -b:a 64k  -c:v libx264 -b:v 256k -f flv rtmp://localhost:1935/hls/$name_mid
  
                -c:a libfdk_aac -b:a 128k -c:v libx264 -b:v 512K -f flv rtmp://localhost:1935/hls/$name_hi
  
                -c:a libfdk_aac -b:a 128k -c:v libx264 -b:v 512K -f flv rtmp://localhost:1935/dash/$name_dash;
  
          }
  
  
  
          application hls {
  
               live on;
  
  
  
               hls on;
  
               hls_path /tmp/hls;
  
               hls_nested on;
  
  
  
               hls_variant _low BANDWIDTH=160000;
  
               hls_variant _mid BANDWIDTH=320000;
  
               hls_variant _hi  BANDWIDTH=640000;
  
          }
  
  
  
          application dash {
  
              live on;
  
  
  
              dash on;
  
              dash_path /tmp/dash;
  
              dash_nested on;
  
          }
  
      }
  
  }

  This is the command I use for streaming

  ffmpeg -re -i 2014\ SPRING.mp4 -c copy -f flv 
  
  rtmp://52.221.221.163:1935/dash/spring

  How can I reduce the delay, and make it play from the same timestamp as the streamer ?

  Can I achieve under 5s latency ?

  UPDATE

  Tried to change the playlist length and fragment length, using this directive

  dash_playlist_length 10s;
  
  dash_fragment 2s;

  But still got some latency problem, sometimes it’s smaller than before, sometimes it’s the same