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• FFSERVER - streaming an ASF video as Webm output

  30 mai 2014, par Emmanuel Brunet

  I’m trying to stream an IP webcam ASF live stream to a ffserver to output a webm video format. The server starts successfully but the ffserver commands used to feed the ffserver fails and generates a core dump.

  Input stream

  $ ffprobe http://account:password@webcam/videostream.asf
  
  
  
  Input #0, asf, from 'http://admin:alpha1237@webcam/videostream.asf':
  
    Duration: N/A, start: 0.000000, bitrate: 32 kb/s
  
      Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj422p(pc), 640x480, 25 tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: adpcm_ima_wav ([17][0][0][0] / 0x0011), 8000 Hz, 1 channels, s16p, 32 kb/s

  ffserver configuration

  my ffserver configuration is :

  Port 8091
  
  RTSPPort 554
  
  BindAddress 192.168.1.62
  
  MaxHTTPConnections 1000
  
  MaxClients 100
  
  MaxBandwidth 1000
  
  CustomLog -
  
  
  
  <feed>
  
          File /tmp/webcam.ffm
  
          FileMaxSize 500M
  
          ACL allow localhost
  
          ACL allow 192.168.0.0 192.168.255.255
  
  
  
  </feed>
  
  
  
  <stream>              # Output stream URL definition
  
     Feed webcam.ffm              # Feed from which to receive video
  
     Format webm
  
  
  
     # Audio settings
  
     AudioCodec vorbis
  
     AudioBitRate 64             # Audio bitrate
  
  
  
     # Video settings
  
     VideoCodec libvpx
  
     VideoSize 640x480           # 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 32            # Video bitrate
  
  </stream>
  
  
  
  <stream>
  
          Format status
  
          # Only allow local people to get the status
  
          ACL allow localhost
  
          ACL allow 192.168.0.0 192.168.255.255
  
  </stream>

  ffmpeg feed

  I run the following command that fails

  $ ffmpeg  -i http://account:password@webcam/videostream.asf http://192.168.1.62:8091/webcam.ffm
  
  http://192.168.1.62:8091/webcam.ffm
  
  Input #0, asf, from 'http://account:password@webcam/videostream.asf':
  
    Duration: N/A, start: 0.000000, bitrate: 32 kb/s
  
      Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj422p(pc), 640x480, 25 tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: adpcm_ima_wav ([17][0][0][0] / 0x0011), 8000 Hz, mono, s16p, 32 kb/s
  
  [swscaler @ 0x36a80c0] deprecated pixel format used, make sure you did set range correctly
  
  Segmentation fault

  I tryed

  $ ffmpeg  -i http://account:password@webcam/videostream.asf -pix_fmt yuv420p  http://192.168.1.62:8091/webcam.ffm

  But it raises the same error.

  Thanks for your help

  Edit

  For an easy testing (I thought), I tried to publish the whole ASF stream as is, meaning connecting the ASF webcam output stream to the ffserver that outputs ASF format too.
  And thus with mirrored encoding so I changed the ffserver configuration to

  ...
  
  <stream>
  
      Feed webcam.ffm
  
      Format asf
  
      VideoFrameRate 25
  
      VideoSize 640X480
  
      VideoBitRate 256
  
      VideoBufferSize 1000
  
      VideoGopSize 30
  
      AudioBitRate 32
  
      StartSendOnKey
  
  </stream>
  
  ...

  And the output is now :

  Input #0, asf, from 'http://admin:alpha1237@webcam/videostream.asf':
  
    Duration: N/A, start: 0.000000, bitrate: 32 kb/s
  
      Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj422p(pc), 640x480, 1k tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: adpcm_ima_wav ([17][0][0][0] / 0x0011), 8000 Hz, mono, s16p, 32 kb/s
  
  [swscaler @ 0x3d620c0] deprecated pixel format used, make sure you did set range correctly
  
  Output #0, ffm, to 'http://192.168.1.62:8091/webcam.ffm':
  
    Metadata:
  
      creation_time   : now
  
      encoder         : Lavf55.40.100
  
      Stream #0:0: Audio: wmav2, 22050 Hz, mono, fltp, 32 kb/s
  
      Metadata:
  
        encoder         : Lavc55.64.100 wmav2
  
      Stream #0:1: Video: msmpeg4v3 (msmpeg4), yuv420p, 640x480, q=2-31, 256 kb/s, 1k fps, 1000k tbn, 1k tbc
  
      Metadata:
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (adpcm_ima_wav -> wmav2)
  
    Stream #0:0 -> #0:1 (mjpeg -> msmpeg4)
  
  Press [q] to stop, [?] for help
  
  Segmentation fault

  I can’t even forward the stream.

• Revision 15eac18c4e : Make filter RD code and encode breakout variance size-independent. Static thres

  13 avril 2013, par Ronald S. Bultje

  Changed Paths : Modify /vp9/encoder/vp9_rdopt.c Make filter RD code and encode breakout variance size-independent. Static threshold results slightly up (+0.1% on derf), probably b/c we now take the filter (sharp/lowpass) into account for the breakout decision. Change-Id : (...)

• Documentation #3972 (En cours) : template variants and possible bug ?

  7 juillet 2017, par b b

  I can read this (in bold) in the documentation you are quoting :

  rubrique.html and article.html : the default templates, which apply to all sections and articles that do not have a specific template, but whose presence is absolutely necessary in the same directory as the variants of the templates for them to be taken into account.

  https://www.spip.net/en_article4363.html

  Seems the info is there...