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• Ffmpeg send duration of video to client (using node-fluent-ffmpeg)

  26 mai 2013, par Vprnl

  I'm really new to the world of ffmpeg so please excuses me if this is a stupid queston.

  I'm using the module Node-fluent-ffmpeg to stream a movie and convert it from avi to webm with FFMPEG.

  So far so good (it plays the video), but I'm having trouble parsing the duration to the player. It also gives me an error even though I plays the video.

  my code is as followed :

  var stat = fs.statSync(movie);
  
  
  
  var start = 0;
  
  var end = 0;
  
  var range = req.header('Range');
  
  if (range != null) {
  
  start = parseInt(range.slice(range.indexOf('bytes=')+6,
  
    range.indexOf('-')));
  
  end = parseInt(range.slice(range.indexOf('-')+1,
  
    range.length));
  
  }
  
  if (isNaN(end) || end == 0) end = stat.size-1;
  
  if (start > end) return;
  
  
  
  var duration = (end / 1024) * 8 / 1024;
  
  
  
  res.writeHead(206, { // NOTE: a partial http response
  
      'Connection':'close',
  
      'Content-Type':'video/webm',
  
      'Content-Length':end - start,
  
      'Content-Range':'bytes '+start+'-'+end+'/'+stat.size,
  
      'Transfer-Encoding':'chunked'
  
  });
  
  
  
  var proc = new ffmpeg({ source: movie, nolog: true, priority: 1, timeout:15000})
  
      .toFormat('webm')
  
      .addOptions(['-probesize 900000', '-analyzeduration 0', '-minrate 1024k', '-maxrate 1024k', '-bufsize 1835k', '-t '+duration+' -ss'])
  
      .writeToStream(res, function(retcode, error){
  
      if (!error){
  
          console.log('file has been converted succesfully',retcode);
  
      }else{
  
          console.log('file conversion error',error);
  
      }
  
  });

  I set the header with a start and a end based on this article : http://delog.wordpress.com/2011/04/25/stream-webm-file-to-chrome-using-node-js/

  I calculate the length in seconds in the variable duration.

  The error FFmpeg is giving me is :

      file conversion error ffmpeg version N-52458-gaa96439 Copyright (c) 2000-2013 the FFmpeg developers
  
        built on Apr 24 2013 22:19:32 with gcc 4.8.0 (GCC)
  
        configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --e
  
      nable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable
  
      -libgsm --enable-libilbc --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --ena
  
      ble-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwola
  
      me --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enabl
  
      e-libxvid --enable-zlib
  
        libavutil      52. 27.101 / 52. 27.101
  
        libavcodec     55.  6.100 / 55.  6.100
  
        libavformat    55.  3.100 / 55.  3.100
  
        libavdevice    55.  0.100 / 55.  0.100
  
        libavfilter     3. 60.101 /  3. 60.101
  
        libswscale      2.  2.100 /  2.  2.100
  
        libswresample   0. 17.102 /  0. 17.102
  
        libpostproc    52.  3.100 / 52.  3.100
  
      Input #0, avi, from 'C:/temp/test.avi':
  
        Metadata:
  
          encoder         : Nandub v1.0rc2
  
        Duration: 00:01:09.78, start: 0.000000, bitrate: 1517 kb/s
  
          Stream #0:0: Video: msmpeg4v3 (DIV3 / 0x33564944), yuv420p, 640x352, 23.98 tbr, 23.98 tbn, 23.98 tbc
  
          Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 222 kb/s
  
      [libvpx @ 0036db20] v1.2.0
  
      Output #0, webm, to 'pipe:1':
  
        Metadata:
  
          encoder         : Lavf55.3.100
  
          Stream #0:0: Video: vp8, yuv420p, 640x352, q=-1--1, 200 kb/s, 1k tbn, 23.98 tbc
  
          Stream #0:1: Audio: vorbis, 48000 Hz, stereo, fltp
  
      Stream mapping:
  
        Stream #0:0 -> #0:0 (msmpeg4 -> libvpx)
  
        Stream #0:1 -> #0:1 (mp3 -> libvorbis)

  The client side player (which is VideoJs) says the file is infinite/NaN in length.

  I feel like I'm pretty close to a solution but my inexperience with the subject matter prohibits me from getting it to work. If I'm unclear in any way please let me know. (I have a tendency of explaining things fuzzy.)

  Thanks in advance !

  [EDIT]

  I removed the duration bit because it has nothing to do with the issue. I checked the response header of the client and saw :

   Accept-Ranges:bytes
  
   Connection:keep-alive
  
   Content-Length:13232127
  
   Content-Range:bytes 0-13232127/13232128
  
   Content-Type:video/webm

  Why can't the client figure out the duration even though it receives it in the header ?

• FFPMEG : stream local file to UDP address, make client aware about video length and current frame time offset (make stream seekable ?)

  10 décembre 2014, par klim

  Just started to use FFMPEG. This is a really great library which is capable of video life transcoding and streaming.

  I use following commands to transcode and stream local video file to UDP address :
  ffmpeg -y -re -i inputvideo.mpeg2 -vsync 1 -vcodec mpeg4 -b 1600k -r 15 -crf 20 -acodec aac -ar 44100 -strict -2 -f mpegts udp ://192.168.1.30:1234

  It works smooth. I can open this udp address in VLC player and play life stream.

  Does anybody know how to make client aware about video duration and current time stamp ?

  Ideally would be nice to make stream seekable, as far as I understand it is not possible, but at least I would like to tell VLC client the total duration of the video and current frame time stamp, so it could show the progress.

  Thanks.

• How to transfer FFmpeg's AVPacket to CUVID's CUVIDSOURCEDATAPACKET ? or how to use FFmpeg's CUVID,any demo ?

  17 mars 2017, par San

  As the title said,I was trapped to How to transfer FFmpeg’s AVPacket to CUVID’s CUVIDSOURCEDATAPACKET,and my main code about this question is below :`

  AVPacket* avpkt;
  
  avpkt = (AVPacket*)av_malloc(sizeof(AVPacket));
  
  CUVIDSOURCEDATAPACKET cupkt;
  
  int iPkt = 0;
  
  while (av_read_frame(pFormatCtx, avpkt) >= 0) {
  
      if (avpkt->stream_index == videoindex) {
  
  
  
          cuCtxPushCurrent(g_oContext);
  
  
  
          if (avpkt && avpkt->size) {
  
              cupkt.payload_size = (unsigned long)avpkt->size;
  
              cupkt.payload = (const unsigned char*)avpkt->data;
  
  
  
              if (avpkt->pts != AV_NOPTS_VALUE) {
  
                  cupkt.flags = CUVID_PKT_TIMESTAMP;
  
                  if (pCodecCtx->pkt_timebase.num && pCodecCtx->pkt_timebase.den) {
  
                      AVRational tb;
  
                      tb.num = 1;
  
                      tb.den = AV_TIME_BASE;
  
                      cupkt.timestamp = av_rescale_q(avpkt->pts, pCodecCtx->pkt_timebase, tb);
  
                  }
  
                  else
  
                      cupkt.timestamp = avpkt->pts;
  
              }
  
          }
  
          else {
  
              cupkt.flags = CUVID_PKT_ENDOFSTREAM;
  
          }
  
  
  
          oResult = cuvidParseVideoData(hParser_, &cupkt);
  
          if ((cupkt.flags & CUVID_PKT_ENDOFSTREAM) || (oResult != CUDA_SUCCESS)) {
  
              break;
  
          }
  
          iPkt++;
  
          printf("Succeed to read avpkt %d !\n", iPkt);
  
          checkCudaErrors(cuCtxPopCurrent(NULL));
  
      }
  
      av_free_packet(avpkt);
  
  }

  and as you see,the code

  cupkt.payload_size = (unsigned long)avpkt->size;
  
  cupkt.payload = (const unsigned char*)avpkt->data;

  needs to be corrected。
  I’m poor at english,I hope I have expressed my self clearly。