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• How does FFMPEG copy work ?

  24 novembre 2017, par Tyler Brooks

  How can I implement the equivalent of this command :

  ffmpeg -i test.h264 -vcodec copy -hls_time 5 -hls_list_size 0 foo.m3u8

  My understanding is that you do something like this (pseudo code for clarity) :

  avformat_open_input(&ctx_in, "test.h264", NULL, NULL);
  
  avformat_find_stream_info(ctx_in, NULL);
  
  
  
  avformat_alloc_output_context2(&ctx_out, NULL, "hls", "foo.m3u8");
  
  strm_out = avformat_new_stream(ctx_out, NULL);
  
  strm_out->time_base = (AVRational){1000000, FRAMERATE};
  
  
  
  strm_out->codecpar->codec_id = AV_CODEC_ID_H264;
  
  strm_out->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
  
  strm_out->codecpar->width = width;
  
  strm_out->codecpar->height = height;
  
  strm_out->codecpar->bit_rate = bitrate;
  
  strm_out->codecpar->codec_tag = 0;
  
  
  
  avcodec_parameters_copy(ctx_out->streams[0]->codecpar,
  
    ctx_in->streams[0]->codecpar);
  
  
  
  avformat_write_header(ctx_out, NULL);
  
  
  
  while(1) {
  
    AVPacket pkt;
  
  
  
    ret = av_read_frame(ctx_in, &pkt);
  
    if (ret < 0)
  
      break;
  
  
  
    pkt.pos = -1;
  
    pkt.stream_index = 0;
  
    pkt.dts = AV_NOPTS_VALUE;
  
    pkt.pts = AV_NOPTS_VALUE;
  
    pkt.pts = SOME_DURATION;
  
  
  
    av_write_frame(ctx_out, &pkt);
  
    av_packet_unref(&pkt);
  
  }
  
  avformat_close_input(&ctx_in);
  
  av_write_trailer(ctx_out);
  
  avformat_free_context(ctx_out);

  I crash on the avformat_find_stream_info() call. I think this is the case because an H264 elemental stream is not really a container (which avformat wants).

  What is the proper way to implement the FFMPEG ’copy’ command of an elemental stream ?

• Use ffmpeg to extract audio track and subtiles to a m3u8 files which can work with video.js

  12 juillet 2020, par Maxou

  I download video with multiple audio track and subtiles but I don't know the exact number and I want to convert this video to m3u8. Someone know a command which can do what i want ? Thanks

  


• ffmpeg -stream_loop doesnt work on hls file

  7 décembre 2022, par Enrique Corpus

  Can someone pls help me figure out my problem with ffmpeg. When I try to add -stream_loop option on the command, I got an error

  


  [AVIOContext @ 0x7f8c42705080] Statistics: 362088 bytes read, 0 seeks296.7kbits/s speed=1.01x Seek to start failed. playlist_main2.m3u8: Operation not permitted

  


  And here is my ffmpeg command
ffmpeg -stream_loop -1 -i playlist_main2.m3u8 -bsf:a aac_adtstoasc -vcodec copy -c copy -crf 50 file.mp4

  


  Im thinking the problem might be on the .ts file, since I dont encounter this error when testing differet hls files, but I want to have a proof that the source is the proble. Pls help me. Attached is the m3u8 file and the .ts file.
HLS FILE

  


  Tried different hls file and the command works. Now im suspecting the problem is on the video (.ts) file itself but i cant prove it.