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• How to raw TS packets off a file/url — Without decoding

  15 août 2019, par Znura

  New to ffmpeg and playing around that to understand better. I’m trying to use ffmpeg code base to get TS packets from a HLS Streaming server. I don’t need any decoding as I just have to store the TS packets to be processed later.

  First I built a minimal FFMPEG as outlined in https://zeranoe.com/forum/viewtopic.php?f=5&t=7426. No decoders and only hls and mpegts demuxers. Then using the following code to receive the frames. While inspecting it doesn’t seem to be MPEG-TS packets while looking into buffers thru GDB. Attaching the code here..

  Two Questions :

  1. Shouldn’t the av_recv_frame get me the TS packets ? However When I trace all the way to playlists (off HLSContext), the read_buffer there contains TS packets. IS there any example I could look into to get TS packets in this scenario without decoders ?

  2. If I get answer for (1), How to get the best stream off the HLS server ? when looking into ffplay, av_find_best_stream() sounds like the one to look into.. But again without needing to decode, is there a way to get best one according to the network condition ?

  Thanks..

  I dumped whatever I got off av_recv_frame() and stored in file. This file is not playable with VLC but Windows Movies & TV player could play the sound with missing frames..

  int main(int argc, char *argv[]) { 
  
      AVFormatContext * ifmt_ctx = NULL; 
  
      char *in_filename = NULL; 
  
      int ret = 0; 
  
      AVPacket pkt; 
  
      if (argc != 2) { return 1; } 
  
      in_filename = argv[1]; 
  
      av_register_all();
  
  
  
      if (!(ifmt_ctx = avformat_alloc_context())) { goto end; } 
  
      if ((ret = avformat_open_input(&ifmt_ctx, in_filename, 0, 0)) < 0) { 
  
          fprintf(stderr, "Could not open input file '%s'", in_filename); 
  
          goto end; 
  
      } 
  
      if ((ret = avformat_find_stream_info(ifmt_ctx, 0)) < 0) { 
  
          fprintf(stderr, "Failed to retrieve input stream information"); 
  
          goto end; 
  
      }
  
  
  
      av_dump_format(ifmt_ctx, 0, in_filename, 0); 
  
      while (1) { 
  
          ret = av_read_frame(ifmt_ctx, &pkt); 
  
          if (ret < 0) break; 
  
          av_free_packet(&pkt); 
  
      } 
  
      end: avformat_close_input(&ifmt_ctx); return 0; 
  
  } 

• Anomalie #3380 : Un rédacteur peut attacher un document à un article qu’il n’a pas le droit de mod...

  8 juin 2015, par b b

  Pour info, cette modification a introduit un bug signalé dans #3452.

• Anomalie #4233 (En cours) : [core & plugin todo] : code HTML généré non valide :

  18 novembre 2018, par b b

  Ici on cause des bugs du core, donc il serait certainement plus approprié de signaler le bug dans le forum de la doc du plugin sur contrib ou sur la liste spip-zone avant d’ouvrir un ticket ;)

  Amha, on peut fermer le ticket, et on verra s’il faut l’ouvrir de nouveau après confirmation que c’est bien un bug du core.