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• ffmpeg generate m3u8 from mp4 (Resume option)

  20 août 2014, par diogopms

  I have a mp4 file or other file (non mp4 format) and i need generate ts files and m3u8 playlist.

  I am using this command and works fine :

  ffmpeg -i foo.mp4 -codec copy -vbsf h264_mp4toannexb -map 0 -f segment
  -segment_list out.m3u8 -segment_time 10 out%03d.ts

  Now I need to generate many ts simultaneous so i need a "resume option".

  Please see the example below :

  One thread (first 20 seconds (0-20))

  ffmpeg -i foo.mp4 -codec copy -vbsf h264_mp4toannexb -map 0 -f segment
  -segment_list out.m3u8 -segment_time 10 out%03d.ts

  Seconds thread (20 seconds to 40 seconds)

  ffmpeg -i foo.mp4 ......

  Third thread (40 seconds to 60 seconds)

  ffmpeg -i foo.mp4 ......

  I have lots of core processor to do this jobs.

  In resume i need generate .ts files and m3u8 fastest way possible

  I need help or advises to resolve my problem.

  Prove of concept i build a litle script that use -ss and -t option :

  <?php
  
  
  
   //generate all the commands using -ss and -t <seconds> 
  
   $startTime = new DateTime("00:00:00");
  
   for ($i=1; $i &lt; 20; $i++) {
  
      $data = $startTime->format('H:i:s');
  
      $exec = 'ffmpeg  -i "<file>" -ss '.$data.' -t 10 -c:v copy -bsf h264_mp4toannexb -flags -global_header -map 0 -f segment -segment_time 10 -segment_start_number '.$i.' -segment_list '.sprintf("%04d", $i).'_test.m3u8 -segment_format mpegts '.$i.'stream%05d.ts';
  
      shell_exec($exec);
  
      $startTime->modify('+10 seconds');
  
      echo "\n";
  
  }
  
  
  
  //cycle all m3u8 and creates a master hls playlist
  
  $files = glob('*.{m3u8}', GLOB_BRACE);
  
  sort($files);
  
  $ret = "#EXTM3U
  
  #EXT-X-VERSION:3
  
  #EXT-X-MEDIA-SEQUENCE:0
  
  #EXT-X-ALLOW-CACHE:YES
  
  #EXT-X-TARGETDURATION:11
  
  ";
  
  foreach($files as $file) {
  
      $ret .= shell_exec('sed -n -e 6,7p '. $file);
  
  }
  
  $ret .= "#EXT-X-ENDLIST";
  
  
  
  file_put_contents('final.m3u8', $ret);
  
  
  
  ?>
  
  </file></seconds>

  Thanks

• how to kill a thread which hang up and release resources [duplicate]

  15 octobre 2019, par DJI_lover

  This question already has an answer here :

  • How do I terminate a thread in C++11 ?
    
    5 answers
    

  I am doing some jobs in ubuntu with c++.I want to know how to kill a thread when function blocking in a thread and there is no timeout mechanism for this function. I want to force to kill the thread when function is blocking and release all the resources in the thread and then restart the thread.I can’t set a quit flag in thread because it nerver get there when function hang up.Could someone tell me the better way to do this ? Thanks !

  Code :

  static int encode_and_write_frame(AVCodecContext *codec_ctx, AVFormatContext *fmt_ctx, AVFrame *frame)
  
  {
  
      AVPacket pkt = {0};
  
      av_init_packet(&pkt);
  
      int ret = avcodec_send_frame(codec_ctx, frame);
  
      if (ret < 0)
  
      {
  
          fprintf(stderr, "Error sending frame to codec context!\n");
  
          return ret;
  
      }
  
      ret = avcodec_receive_packet(codec_ctx, &pkt);
  
      if (ret < 0)
  
      {
  
          fprintf(stderr, "Error receiving packet from codec context!\n" );
  
          return ret;
  
      }
  
      int ret1 = av_interleaved_write_frame(fmt_ctx, &pkt);
  
      av_packet_unref(&pkt);
  
      return ret1;
  
  }
  
  
  
  void thread_worker(){
  
      while(ros::ok()){
  
          encode_and_write_frame(param1,param2,param3);
  
          usleep(500000);
  
      }
  
  }
  
  
  
  thread t(&thread_worker);

  when the network situation is good, av_interleaved_write_frame() can return quickly,but when network was broken down, av_interleaved_write_frame() will hang forever, and I can’t set timeout for av_interleaved_write_frame so that I want to kill the blocking thread and restart it.

• FFmpeg compiling error(libavfilter/vf_scale_cuda.cu)

  11 août 2021, par Amir Mousavi

  installed packages :

  


  


  libx264 - cuda11.2 - cuda-toolkit - nvidia-driver-465

  


  


  command :

  


  ./configure —enable-nonfree —enable-cuvid —enable-nvenc —enable-cuda-nvcc —enable-libx264 —enable-gpl —extra-cflags=-I/usr/local/cuda/include —extra-ldflags=-L/usr/local/cuda/lib64

  


  here is latest lines errors :

  


  


  libavfilter/vf_scale_cuda.cu(1123) : error : a template argument may not reference a non-external entity

  


  libavfilter/vf_scale_cuda.cu(1123) : error : a template argument may not reference a non-external entity

  


  libavfilter/vf_scale_cuda.cu(1124) : error : a template argument may not reference a non-external entity

  


  libavfilter/vf_scale_cuda.cu(1124) : error : a template argument may not reference a non-external entity

  


  libavfilter/vf_scale_cuda.cu(1124) : error : a template argument may not reference a non-external entity

  


  libavfilter/vf_scale_cuda.cu(1124) : error : a template argument may not reference a non-external entity

  


  Error limit reached.
100 errors detected in the compilation of >"/tmp/tmpxft_000032a1_00000000-7_vf_scale_cuda.cpp1.ii".
Compilation terminated.
ffbuild/common.mak:108 : recipe for target >'libavfilter/vf_scale_cuda.ptx' failed
make : *** [libavfilter/vf_scale_cuda.ptx] Error 4
make : *** Waiting for unfinished jobs....

  


  


  I don't know where is the problem.

  


  lines that error referenced :

  


  EAREST_KERNELS(yuv420p)
NEAREST_KERNELS(nv12)
NEAREST_KERNELS(yuv444p)
NEAREST_KERNELS(p010le)
NEAREST_KERNELS(p016le)
NEAREST_KERNELS(yuv444p16le)