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• libavcodec/mpeg12dec : append CC data to a53_buf_ref

  14 décembre 2024, par Scott Theisen

  libavcodec/mpeg12dec : append CC data to a53_buf_ref
  In mpeg_decode_a53_cc() only the A/53 part 4 CC data ("GA94") is saved between
  
  frames. The other formats incorrectly created a larger buffer than they use
  
  since a705bcd763e344fac191e157ffeddc285388b7fa because they did not append to
  
  the previous data.
  The a53_buf_ref is added to the frame in mpeg_field_start() which will only be
  
  called in decode_chunks() if not all of the picture data slices are skipped.
  For these formats, utilize the data added to the buffer in case frames are skipped
  
  (concatenating the CC data until a frame can be exported), in a similar fashion to
  
  the A/53 part 4 logic.
  Reviewed-by : Marth64 <marth64@proxyid.net>
  
  Signed-off-by : Marth64 <marth64@proxyid.net>
  

  • [DH] libavcodec/mpeg12dec.c

• Nginx RTMP/HLS - stream to ffmpeg and output HLS

  20 novembre 2018, par kanazaca

  At this point my solution is working but only as RTMP, i can watch perfectly my stream using the URL :

  rtmp://X.X.X.X:1935/show/name

  But the problem is that my LG Smart Tv which uses WebOS don’t support RTMP and i would really like to play my stream there. The only solution that i can see right now is to use HLS. With HLS all works fine too, but i need to execute my ffmpeg command before open the HLS stream in TV, otherwise it will not create the files necessary to display the stream on my TV.

  So my goal is to serve a stream as HLS without having to trigger the RTMP endpoint or the FFMPEG manually.

  I’m really struggling with this, waste 3 days trying to make it work :(

  http 
  
  {
  
  location /hls 
  
  {
  
      # Disable cache
  
      add_header Cache-Control no-cache;
  
  
  
      # CORS setup
  
      add_header 'Access-Control-Allow-Origin' '*' always;
  
      add_header 'Access-Control-Expose-Headers' 'Content-Length';
  
  
  
      # allow CORS preflight requests
  
      if ($request_method = 'OPTIONS') {
  
          add_header 'Access-Control-Allow-Origin' '*';
  
          add_header 'Access-Control-Max-Age' 1728000;
  
          add_header 'Content-Type' 'text/plain charset=UTF-8';
  
          add_header 'Content-Length' 0;
  
          return 204;
  
      }
  
  
  
      types {
  
          application/vnd.apple.mpegurl m3u8;
  
          video/mp2t ts;
  
      }
  
  
  
      root /mnt/;
  
      }
  
  }
  
  
  
  }
  
  rtmp {
  
  server {
  
      listen 1935;
  
  
  
      chunk_size 4000;
  
      buflen 5s;
  
  
  
      application show {
  
          live on;
  
  
  
      exec_pull ffmpeg -re -i http://stream-coming.com/$name.ts -c:v libx264 -preset faster -pix_fmt yuv420p -c:a aac -f flv rtmp://localhost/show/$name;
  
  
  
          # Turn on HLS
  
          hls on;
  
          hls_path /mnt/hls/;
  
          hls_fragment 3;
  
          hls_playlist_length 60;
  
          # disable consuming the stream from nginx as rtmp
  
          deny play all;
  
      }
  
  }

  }

  Thanks for your time ;)

• What video codecs work on Google Chromebook

  3 mars 2019, par MonkeyDLuffy

  I’m trying to put a show on my friends Google Chromebook but the mp4 files show up black when trying to watch them on said Chromebook, audio works fine. I found out that it is a video encoding problem but I cannot find a list of video formats that work on the Chromebook. I have ffmpeg and handbrake to try and test some things, but if someone could tell me a ffmpeg code that will convert the video files into a format that works on a Google Chromebook that would help a lot.

  What I’ve tried :

  ffmpeg -i "Game of Thrones S02E01 The North Remembers.mkv" codec mpeg "Game of Thrones S02E01 The North Remembers.mp4"

  Which gives error :

  [NULL @ 00000177196ea500] Unable to find a suitable output format for
  ’codec’ codec : Invalid argument