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• C# capture specific frame from video file using ffmpeg takes too long

  6 septembre 2018, par Ditza

  I am trying to take specific frame from full HD video file. I am using Accord.Video.FFMPEG.
  The read ReadVideoFrame takes something like 200ms. I need It to be much faster.
  Am I doing something wrong or this is the time it should takes ? What should I use to get the frame in few milliseconds ?

  VideoFileReader reader = new VideoFileReader();
  
  reader.Open(source);
  
  int frameN = (int)Math.Floor(((reader.FrameRate).ToDouble() * pos.Milliseconds) / 1000);
  
  Bitmap bkg = reader.ReadVideoFrame(frameN);

  Thanks,
  Ditza

• av_interleaved_write_frame() : Immediate exit requested when streaming WebM

  21 décembre 2013, par kd0hdf

  Ok, so I am trying to stream live video from my HD Homerun Prime (a network tv tuner that outputs mpeg2 video) to the web as WebM with ffserver. However, when I start ffmpeg it will run normally for a few seconds (and even output video through ffserver) then after 2-3 seconds it will freeze and I have to use ctrl+c to get back to a prompt.What am I missing here ? Sorry if this is a total newbie question.

  I should also mention I followed a tutorial here : https://www.virag.si/2012/11/streaming-live-webm-video-with-ffmpeg/

  FFmpeg command

  new@Desktop:~$ ffmpeg -i <network tuner="tuner"> <ffserver>
  
  ffmpeg version git-2013-12-12-d546a59 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Dec 13 2013 21:51:49 with gcc 4.8 (Ubuntu/Linaro 4.8.1-10ubuntu9)
  
    configuration: --prefix=/home/new/ffmpeg_build --extra-cflags=-I/home/new/ffmpeg_build/include --extra-ldflags=-L/home/new/ffmpeg_build/lib --bindir=/home/new/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab
  
    libavutil      52. 58.100 / 52. 58.100
  
    libavcodec     55. 45.101 / 55. 45.101
  
    libavformat    55. 22.100 / 55. 22.100
  
    libavdevice    55.  5.102 / 55.  5.102
  
    libavfilter     3. 92.100 /  3. 92.100
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [mpegts @ 0x326f980] Could not find codec parameters for stream 0 (Unknown: none (ETV1 / 0x31565445)): unknown codec
  
  Consider increasing the value for the &#39;analyzeduration&#39; and &#39;probesize&#39; options
  
  [mpegts @ 0x326f980] Could not find codec parameters for stream 1 (Unknown: none (ETV1 / 0x31565445)): unknown codec
  
  Consider increasing the value for the &#39;analyzeduration&#39; and &#39;probesize&#39; options
  
  [mpegts @ 0x326f980] Could not find codec parameters for stream 4 (Unknown: none ([134][0][0][0] / 0x0086)): unknown codec
  
  Consider increasing the value for the &#39;analyzeduration&#39; and &#39;probesize&#39; options
  
  Input #0, mpegts, from &#39;http://192.168.0.199:5004/auto/v39&#39;:
  
    Duration: N/A, start: 85618.589122, bitrate: 192 kb/s
  
    Program 8 
  
      Stream #0:0[0x1093]: Unknown: none (ETV1 / 0x31565445)
  
      Stream #0:1[0x1094]: Unknown: none (ETV1 / 0x31565445)
  
      Stream #0:2[0x1095]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv), 704x480 [SAR 10:11 DAR 4:3], max. 15000 kb/s, 29.97 fps, 59.94 tbr, 90k tbn, 59.94 tbc
  
      Stream #0:3[0x1096](eng): Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, stereo, fltp, 192 kb/s
  
      Stream #0:4[0x1097]: Unknown: none ([134][0][0][0] / 0x0086)
  
  [libvpx @ 0x3275060] v1.2.0
  
  Output #0, ffm, to &#39;http://localhost:8090/feed1.ffm&#39;:
  
    Metadata:
  
      creation_time   : now
  
      encoder         : Lavf55.22.100
  
      Stream #0:0(eng): Audio: vorbis (libvorbis), 22050 Hz, mono, fltp, 64 kb/s
  
      Stream #0:1: Video: vp8 (libvpx), yuv420p, 720x576 [SAR 16:15 DAR 4:3], q=10-42, 1000 kb/s, 1000k tbn, 29.97 tbc
  
  Stream mapping:
  
    Stream #0:3 -> #0:0 (ac3 -> libvorbis)
  
    Stream #0:2 -> #0:1 (mpeg2video -> libvpx)
  
  Press [q] to stop, [?] for help
  
  ^Cav_interleaved_write_frame(): Immediate exit requested70 bitrate= 936.1kbits/s dup=51 drop=0    
  
  Received signal 2: terminating.
  
  new@Desktop:~$ 
  
  </ffserver></network>

  FFserver configuration :

  Port 8090                      # Port to bind the server to
  
  BindAddress 0.0.0.0
  
  MaxHTTPConnections 2000
  
  MaxClients 1000
  
  MaxBandwidth 10000             # Maximum bandwidth per client
  
                                 # set this high enough to exceed stream bitrate
  
  CustomLog -
  
  NoDaemon                       # Remove this if you want FFserver to daemonize after start
  
  
  
  <feed>               # This is the input feed where FFmpeg will send
  
     File /tmp/feed1.ffm         # video stream.
  
     FileMaxSize 1G              # Maximum file size for buffering video
  
     #ACL allow 127.0.0.1         # Allowed IPs
  
  </feed>
  
  
  
  <stream>              # Output stream URL definition
  
     Feed feed1.ffm              # Feed from which to receive video
  
     Format webm
  
  
  
     # Audio settings
  
     AudioCodec vorbis
  
     AudioBitRate 64             # Audio bitrate
  
  
  
     # Video settings
  
     VideoCodec libvpx
  
     VideoSize 720x576           # Video resolution
  
     VideoFrameRate 25           # Video FPS
  
     AVOptionVideo flags +global_header  # Parameters passed to encoder
  
                                         # (same as ffmpeg command-line parameters)
  
     AVOptionVideo cpu-used 0
  
     AVOptionVideo qmin 10
  
     AVOptionVideo qmax 42
  
     AVOptionVideo quality good
  
     AVOptionAudio flags +global_header
  
     PreRoll 15
  
     StartSendOnKey
  
     VideoBitRate 1000            # Video bitrate
  
  </stream>
  
  
  
  <stream>            # Server status URL
  
     Format status
  
     # Only allow local people to get the status
  
     ACL allow localhost
  
     ACL allow 192.168.0.0 192.168.255.255
  
  </stream>
  
  
  
  <redirect>    # Just an URL redirect for index
  
     # Redirect index.html to the appropriate site
  
     URL <removed url="url" to="to" ffmpeg="ffmpeg" homepage="homepage">
  
  </removed></redirect>

  ...and for the FFserver side

  new@Desktop:/var/www$ ffserver -d -f /etc/ffserver.conf
  
  ffserver version git-2013-12-12-d546a59 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Dec 13 2013 21:51:49 with gcc 4.8 (Ubuntu/Linaro 4.8.1-10ubuntu9)
  
    configuration: --prefix=/home/new/ffmpeg_build --extra-cflags=-I/home/new/ffmpeg_build/include --extra-ldflags=-L/home/new/ffmpeg_build/lib --bindir=/home/new/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab
  
    libavutil      52. 58.100 / 52. 58.100
  
    libavcodec     55. 45.101 / 55. 45.101
  
    libavformat    55. 22.100 / 55. 22.100
  
    libavdevice    55.  5.102 / 55.  5.102
  
    libavfilter     3. 92.100 /  3. 92.100
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Fri Dec 20 23:53:20 2013 FFserver started.
  
  Fri Dec 20 23:53:29 2013 127.0.0.1 - - New connection: GET /feed1.ffm
  
  Fri Dec 20 23:53:29 2013 127.0.0.1 - - [GET] "/feed1.ffm HTTP/1.1" 200 4175

• ffmpeg : create a video from images and sounds

  27 septembre 2018, par Yuri Gusak

  You need to create a video from a set of pictures and sounds using ffmpeg.
  Set of pictures : frame_% d.jpg
  Sounds :
  sound1.mp3 (from 0 ms)
  sound2.mp3 (from 1000 ms)
  sound3.mp3 (from 2000 ms)
  

  I can create a video with one sound :

  -i frame_% d.jpg -i sound1.mp3 -r 30 -s 1280x720 -preset ultrafast -crf 25 -shortest movie.mp4

  and it works.

  But I need to add some sounds at different times. How can I do that ? May be -filter_complex will help ?