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• ffmpeg copy a part of a video wrt to milliseconds accurately

  25 août 2016, par Santhosh Yedidi

  I am using ffmpeg to copy a part of video.

  I am using mpv to view the video. I get the start time and end time from it.

  ffmpeg -i "main.flv" -ss 01:54:34.340 -to 02:01:13.073 -c copy copied.mp4

  the problem i am facing is the video does not start from 01:54:34.340, it starts from 01:54:34.608

  so its shifting the start poistion.

  Is there any way i can start from the exact millisecond position or form that particular frame.

  or is there command to mention start frame number and end frame number. For that mpv also should tell me the frame numbers in ths OSD

  the output of the above command is

  Input #0, flv, from 'main.flv':
  
    Metadata:
  
      author          : 
  
      copyright       : 
  
      description     : 
  
      keywords        : 
  
      rating          : 
  
      title           : 
  
      presetname      : Custom
  
      creationdate    : Thu Aug 25 04:50:55 2016
  
                      : 
  
      videodevice     : VidBlaster
  
      avclevel        : 31
  
      avcprofile      : 77
  
      videokeyframe_frequency: 5
  
      audiodevice     : Realtek HD Audio Input
  
      audiochannels   : 2
  
      audioinputvolume: 100
  
    Duration: 03:55:58.86, start: 0.033000, bitrate: 855 kb/s
  
      Stream #0:0: Video: h264 (Main), yuv420p(tv), 640x480 [SAR 1:1 DAR 4:3], 819 kb/s, 30.30 fps, 29.97 tbr, 1k tbn, 59.94 tbc
  
      Stream #0:1: Audio: aac (LC), 22050 Hz, stereo, fltp, 49 kb/s
  
  Output #0, mp4, to 'copied.mp4':
  
    Metadata:
  
      author          : 
  
      copyright       : 
  
      description     : 
  
      keywords        : 
  
      rating          : 
  
      title           : 
  
      presetname      : Custom
  
      creationdate    : Thu Aug 25 04:50:55 2016
  
                      : 
  
      videodevice     : VidBlaster
  
      avclevel        : 31
  
      avcprofile      : 77
  
      videokeyframe_frequency: 5
  
      audiodevice     : Realtek HD Audio Input
  
      audiochannels   : 2
  
      audioinputvolume: 100
  
      encoder         : Lavf57.25.100
  
      Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=2-31, 819 kb/s, 30.30 fps, 29.97 tbr, 16k tbn, 1k tbc
  
      Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 22050 Hz, stereo, 49 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=    0 fps=0.0 q=-1.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=  frame=    0 fps=0.0 q=-1.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=  frame=11906 fps=8002 q=-1.0 Lsize=   41574kB time=00:06:38.75 bitrate= 854.1kbits/s speed= 268x    
  
  video:38866kB audio:2336kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.904480%

• Streaming Rtsp stream to website using FFmpeg and FFserver.

  23 août 2016, par Pallav Gupta

  I am working on a website for a client and one of the requirement is to embed the video from HikVision DVR DS7116. I have the RTSP url for the DVR. I want help with FFmpeg and FFserver. I already have written my ffserver config file.

  /etc/ffserver.config
  
  
  
  Port 9500
  
  # bind to all IPs aliased or not
  
  BindAddress 0.0.0.0
  
  # max number of simultaneous clients
  
  MaxClients 1000
  
  # max bandwidth per-client (kb/s)
  
  MaxBandwidth 10000
  
  # Suppress that if you want to launch ffserver as a daemon.
  
  NoDaemon
  
  
  
  <feed>
  
  File /tmp/feed1.ffm
  
  FileMaxSize 5M
  
  </feed>
  
  
  
  <stream>
  
  Feed feed1.ffm
  
  Format swf
  
  VideoCodec flv
  
  VideoFrameRate 15
  
  VideoBufferSize 80000
  
  VideoBitRate 100
  
  VideoQMin 1
  
  VideoQMax 5
  
  VideoSize 352x288
  
  PreRoll 0
  
  Noaudio
  
  </stream>

  I next run my ffserver and ffmpeg command which is

  ffserver & ffmpeg -re -i rtsp://admin:12345@192.168.1.3/MPEG-4/ch1/main/av_stream  http://192.168.1.105:9500/feed1.ffm

  The output which i receive is as follows

  ffmpeg version N-80901-gfebc862 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  
    configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libfreetype --enable-gnutls --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab
  
  
  
    libavutil      55. 28.100 / 55. 28.100
  
    libavcodec     57. 48.101 / 57. 48.101
  
    libavformat    57. 41.100 / 57. 41.100
  
    libavdevice    57.  0.102 / 57.  0.102
  
    libavfilter     6. 47.100 /  6. 47.100
  
    libavresample   3.  0.  0 /  3.  0.  0
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  1.100 /  2.  1.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  
  
  [rtsp @ 0x20c4720] Missing PPS in sprop-parameter-sets, ignoring
  
  [h264 @ 0x20c7f60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x20c7f60] decode_slice_header error
  
  [h264 @ 0x20c7f60] no frame!
  
  [rtsp @ 0x20c4720] RTP: missed 1137 packets
  
  [rtsp @ 0x20c4720] max delay reached. need to consume packet
  
  [rtsp @ 0x20c4720] RTP: missed 1125 packets
  
  [rtsp @ 0x20c4720] max delay reached. need to consume packet
  
  [rtsp @ 0x20c4720] RTP: missed 1126 packets
  
  
  
  Guessed Channel Layout for Input Stream #0.1 : mono
  
  Input #0, rtsp, from 'rtsp://admin:12345@192.168.1.3/MPEG-4/ch1/main/av_stream':
  
    Metadata:
  
      title           : HIK Media Server
  
      comment         : HIK Media Server Session Description : standard
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: h264 (Baseline), yuv420p, 352x288, 10 fps, 25 tbr, 90k tbn, 20 tbc
  
      Stream #0:1: Audio: pcm_mulaw, 8000 Hz, 1 channels, s16, 64 kb/s
  
  [ffm @ 0x21c0e80] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
  
  
  Output #0, ffm, to 'http://192.168.1.105:9500/feed1.ffm':
  
    Metadata:
  
      title           : HIK Media Server
  
      comment         : HIK Media Server Session Description : standard
  
      creation_time   : now
  
      encoder         : Lavf57.41.100
  
      Stream #0:0: Video: flv1 (flv), yuv420p, 352x288, q=1-5, 100 kb/s, 10 fps, 1000k tbn, 15 tbc
  
  
  
      Metadata:
  
        encoder         : Lavc57.48.101 flv
  
      Side data:
  
        cpb: bitrate max/min/avg: 200000/0/100000 buffer size: 655360000 vbv_delay: -1
  
  
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> flv1 (flv))
  
  Press [q] to stop, [?] for help
  
  frame=    0 fps=0.0 q=0.0 size=       4kB time=00:00:00.00 bitrate=N/A speed=   frame=    0 fps=0.0 q=0.0 size=       4kB time=00:00:00.00 bitrate=N/A speed=   frame=    0 fps=0.0 q=0.0 size=       4kB time=00:00:00.00 bitrate=N/A speed=   Past duration 1.003319 too large
  
      Last message repeated 1 times
  
  Past duration 1.005333 too large
  
  frame=   31 fps= 15 q=31.0 size=      56kB time=00:00:02.00 bitrate= 229.4kbits/Past duration 1.005653 too large
  
  Past duration 1.005989 too large
  
  frame=   37 fps= 15 q=24.8 size=      76kB time=00:00:02.40 bitrate= 259.4kbits/Past duration 1.006660 too large
  
  Past duration 1.006996 too large
  
  frame=   46 fps= 15 q=31.0 size=      80kB time=00:00:03.00 bitrate= 218.5kbits/Past duration 1.007988 too large
  
  Past duration 1.008659 too large
  
  frame=   53 fps= 15 q=31.0 size=      96kB time=00:00:03.46 bitrate= 226.9kbits/Past duration 1.009987 too large
  
  Past duration 1.010323 too large
  
  frame=   61 fps= 15 q=24.8 size=     116kB time=00:00:04.00 bitrate= 237.6kbits/Past duration 1.010994 too large
  
  Past duration 1.011330 too large
  
  Past duration 1.011986 too large
  
  frame=   68 fps= 15 q=31.0 size=     120kB time=00:00:04.46 bitrate= 220.1kbits/Past duration 1.012657 too large
  
  
  
  [rtsp @ 0x20c4720] max delay reached. need to consume packet
  
  [rtsp @ 0x20c4720] RTP: missed 1114 packets
  
  [rtsp @ 0x20c4720] max delay reached. need to consume packet
  
  [rtsp @ 0x20c4720] RTP: missed 1115 packets
  
  Past duration 1.012993 too large
  
  frame=   76 fps= 15 q=31.0 size=     140kB time=00:00:05.00 bitrate= 229.4kbits/Past duration 1.013664 too large
  
  Past duration 1.014320 too large
  
  Past duration 1.014656 too large
  
  frame=   83 fps= 15 q=31.0 size=     144kB time=00:00:05.46 bitrate= 215.8kbits/Past duration 1.015327 too large
  
  [rtsp @ 0x20c4720] max delay reached. need to consume packet
  
  [rtsp @ 0x20c4720] RTP: missed 1103 packets
  
  [rtsp @ 0x20c4720] max delay reached. need to consume packet
  
  [rtsp @ 0x20c4720] RTP: missed 1104 packets
  
  
  
  Past duration 1.015999 too large
  
  frame=   91 fps= 15 q=31.0 size=     160kB time=00:00:06.00 bitrate= 218.5kbits/Past duration 1.016655 too large
  
  Past duration 1.017326 too large
  
  Past duration 1.017998 too large
  
  frame=   98 fps= 15 q=31.0 size=     180kB time=00:00:06.46 bitrate= 228.0kbits/Past duration 1.018654 too large
  
  [rtsp @ 0x20c4720] max delay reached. need to consume packet
  
  [rtsp @ 0x20c4720] RTP: missed 1092 packets
  
  [rtsp @ 0x20c4720] max delay reached. need to consume packet
  
  [rtsp @ 0x20c4720] RTP: missed 1093 packets
  
  Past duration 1.019325 too large
  
  frame=  106 fps= 15 q=31.0 size=     184kB time=00:00:07.00 bitrate= 215.3kbits/Past duration 1.019997 too large
  
  [rtsp @ 0x20c4720] max delay reached. need to consume packet
  
  [rtsp @ 0x20c4720] RTP: missed 35 packets
  
  Past duration 1.020653 too large
  
  frame=  161 fps= 15 q=31.0 size=     264kB time=00:00:10.66 bitrate= 202.8kbits/Past duration 1.032661 too large
  
  Past duration 1.033333 too large
  
  frame=  167 fps= 15 q=31.0 Lsize=     276kB time=00:00:11.06 bitrate= 204.3kbits/s dup=94 drop=0 speed=0.964x
  
  video:265kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 4.280833%

  I can see that with some errors, the stream starts.
  When i put the output url in my html code, there is no stream. I also tried playing the network stream in VLC and did not get anything. Can anyone please help me with that ? Any leads are also appreciated. Thank you.

  My HTML Code is :

• FFmpeg / libavcodec : Encoding with x264 ignores bitrate setting

  16 août 2016, par Fasteno

  I am trying to write a video using the FFmpeg libraries. So far I can successfully encode videos with the .avi extension, but when I use the .mp4 extension the application ignores completely the bitrate option I specify.

  Here’s a snippet of the code I use to specify the encoding settings :

  //define video stream
  
  AVOutputFormat* outFmt = nullptr;
  
  outFmt = av_guess_format(NULL, m_pcFilename.c_str(), NULL);
  
  avformat_alloc_output_context2(&m_pcOC, outFmt, NULL, NULL);
  
  AVFormatContext* m_pcOC;
  
  AVStream* m_pcVideoSt = avformat_new_stream(m_pcOC, NULL);
  
  AVCodec* codec = nullptr;
  
  codec = avcodec_find_encoder(codecID);
  
  avcodec_get_context_defaults3(m_pcVideoSt->codec, codec);
  
  //set some parameters
  
  double dBitrate = std::stod(bitrate);
  
  m_pcVideoSt->codec->codec_id = codecID;
  
  m_pcVideoSt->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  
  m_pcVideoSt->codec->bit_rate = dBitrate;
  
  m_pcVideoSt->codec->bit_rate_tolerance = 20000;
  
  m_pcVideoSt->codec->width = m_iOutCols;
  
  m_pcVideoSt->codec->height = m_iOutRows;
  
  m_pcVideoSt->codec->time_base.den = static_cast<int>(dFps);
  
  m_pcVideoSt->codec->time_base.num = 1;
  
  if (m_pcOC->oformat->flags &amp; AVFMT_GLOBALHEADER)
  
  {
  
    m_pcVideoSt->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
  
  }
  
  /* open the codec */
  
  AVDictionary* pcOpts = nullptr;
  
  int res1 = av_dict_set(&amp;pcOpts, "b", bitrate.c_str(), 0);
  
  int res = avcodec_open2(m_pcVideoSt->codec, codec, &amp;pcOpts);
  
  </int>

  This is the output I get when creating a .avi file

  ffprobe version 2.8.6 Copyright (c) 2007-2016 the FFmpeg developers
  
  built with gcc 5.3.0 (GCC)
  
  configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
  
  libavutil      54. 31.100 / 54. 31.100
  
  libavcodec     56. 60.100 / 56. 60.100
  
  libavformat    56. 40.101 / 56. 40.101
  
  libavdevice    56.  4.100 / 56.  4.100
  
  libavfilter     5. 40.101 /  5. 40.101
  
  libswscale      3.  1.101 /  3.  1.101
  
  libswresample   1.  2.101 /  1.  2.101
  
  libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, avi, from 'testGrey2.avi':
  
  Metadata:
  
  encoder         : Lavf56.40.101
  
  Duration: 00:01:20.00, start: 0.000000, **bitrate: 433 kb/s**
  
  Stream #0:0: Video: **mpeg4 (Advanced Simple Profile)** (FMP4 / 0x34504D46), yuv420p, 720x576 [SAR 1:1 DAR 5:4], 428 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc

  And this is what I get when creating an .mp4 file

  ffprobe version 2.8.6 Copyright (c) 2007-2016 the FFmpeg developers
  
  built with gcc 5.3.0 (GCC)
  
  configuration: --disable-static --enable-shared --enable-gpl --enable-    version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-    libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
  
  libavutil      54. 31.100 / 54. 31.100
  
  libavcodec     56. 60.100 / 56. 60.100
  
  libavformat    56. 40.101 / 56. 40.101
  
  libavdevice    56.  4.100 / 56.  4.100
  
  libavfilter     5. 40.101 /  5. 40.101
  
  libswscale      3.  1.101 /  3.  1.101
  
  libswresample   1.  2.101 /  1.  2.101
  
  libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'testGrey2.mp4':
  
  Metadata:
  
  major_brand     : isom
  
  minor_version   : 512
  
  compatible_brands: isomiso2avc1mp41
  
  encoder         : Lavf56.40.101
  
  Duration: 00:01:20.00, start: 0.000000, **bitrate: 1542 kb/s**
  
  Stream #0:0(und): **Video: h264 (High)** (avc1 / 0x31637661), yuv420p, 720x576, 1540 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
  Metadata:
  
    handler_name    : VideoHandler

  Any ideas on why is this happening ? What is the preferred way to specify the bitrate of the output video ?