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• ffmpeg is dropping frames and only using 1/10 cpu [on hold]

  7 décembre 2013, par wlraider70

  I have some old hardware so I'm not expecting miracles. I want to stream from a webcam to ustream at standard quality.

  I'm using a code like

  sudo ffmpeg -re -f v4l2 -i /dev/video1 -f flv "rtmp://1.16543hvtJ6aU flashver=FME/2.5\20(compatible;\20FMSc\201.0)"

  or

     sudo ffmpeg -re -f v4l2 -r 25 -s 640x480 -i /dev/video1 -f flv "rtmp://1.166aU flashver=FME/2.5\20(compatible;\20FMSc\201.0)

  I'm getting results like

  Tasks: 102 total,   1 running,  99 sleeping,   2 stopped,   0 zombie
  
  Cpu(s):  5.7%us,  0.7%sy,  0.0%ni, 93.6%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
  
  Mem:   1920560k total,   339028k used,  1581532k free,    19112k buffers
  
  Swap:  1963004k total,        0k used,  1963004k free,   129300k cached
  
  
  
    PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
  
   3176 root      20   0  222m  31m  24m S  5.0  1.7   0:01.60 ffmpeg

  and

    Metadata:
  
      encoder         : Lavf53.32.100
  
      Stream #0:0: Video: flv1 ([2][0][0][0] / 0x0002), yuv420p, 640x480, q=2-31, 200 kb/s, 1k tbn, 30 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo -> flv)
  
  Press [q] to stop, [?] for help
  
  frame=  330 fps=  5 q=2.5 size=     808kB time=00:01:02.70 bitrate= 105.5kbits/s dup=0 drop=137

  How can I push the system harder or figure out where my bottleneck is ?

• Node.js Webm live stream server : issues with tag

  10 décembre 2013, par breathe0

  I'm using Node.js as stream server to stream realtime Webm videos that is sent by FFMPEG (executed from another application, the stream is done via HTTP) and received by a webapp that uses the tag.

  This is what I'm doing : FFMPEG streams the received frames using the following command :

  ffmpeg -r 30 -f rawvideo  -pix_fmt bgra -s 640x480 
  
  -i \\.\pipe\STREAM_PIPE -r 60 
  
  -f segment  -s 240x160 -codec:v libvpx  -f webm 
  
  http://my.domain.com/video_stream.webm

  (the stream comes from an application that uses the Kinect as source and communicates with FFMPEG through a pipe, sending one frame after another)

  When the webapp connects, it receives immediately this response from the server :

  HTTP/1.1 200 OK
  
  X-Powered-By: Express
  
  content-type: video/webm
  
  cache-control: private
  
  connection: close
  
  Date: Fri, 06 Dec 2013 14:36:31 GMT

  and a Webm header (previously stored on the server, with the same resolution and frame rate of the source stream and tested as working on VLC) is immediately appended. Then the webapp starts to receive the data streamed by FFMPEG. Here is a screenshot of Mkvinfo GUI showing the fields of the header :

  

  However, even if the Network tab of the Chrome console shows that there is an actual stream of data (meaning that what is streamed is not completely garbage, otherwise the connection would be dropped), the player doesn't display anything. We tried to manually prepend our header to the dumped video received by the webapp and VLC plays it just fine, but this is not happening with the tag.

  What can cause this problem ? Are we missing something about the encoding on the FFMPEG side or we stored wrong values on the header (or they're not enough) ?

  PS : I cannot rely on an extern stream server.

  PPS : We tried the following experiments :

  • substituting the video header with the one stored in the server makes the video playable on both vlc and video tag
  • if we dump the video that is already started (without an header) and we prepend the video header stored in the server or even its original header, the video is playable in VLC but not on the tag (we're carefully prepending the header just before the beggining of the cluster).

• ffmpeg binary which can work on Ubuntu version 13.10 [on hold]

  6 décembre 2013, par user2007454

  Can anybody tell me where can I find ffmpeg binary for ubuntu version 13.10, I have spent days in ffmpeg compilation but every time I try to convert my video file from one format to other I am getting an eror I think working with binary would be a good idea plz do share your comments on this

  ffmpeg -i linux_vid.mp4 linux_vid.avi
  
  ffmpeg version 0.8.9-6:0.8.9-0ubuntu0.13.10.1, Copyright (c) 2000-2013 the Libav developers
  
    built on Nov  9 2013 19:15:22 with gcc 4.8.1
  
  *** THIS PROGRAM IS DEPRECATED ***
  
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'linux_vid.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf54.59.106
  
      comment         : 1364833251131047
  
    Duration: 00:00:56.45, start: 0.000000, bitrate: 231 kb/s
  
      Stream #0.0(und): Video: h264 (Constrained Baseline), yuv420p, 320x238 [PAR 4057:4095 DAR 129824:97461], 133 kb/s, PAR 41531:41920 DAR 349:262, 24 fps, 24 tbr, 12288 tbn, 48 tbc
  
      Stream #0.1(und): Audio: aac, 44100 Hz, stereo, s16, 93 kb/s
  
  [buffer @ 0x94225c0] w:320 h:238 pixfmt:yuv420p
  
  [mpeg4 @ 0x943fa80] Invalid pixel aspect ratio 41531/41920, limit is 255/255
  
  Output #0, avi, to 'linux_vid.avi':
  
      Stream #0.0(und): Video: mpeg4, yuv420p, 320x238 [PAR 41531:41920 DAR 349:262], q=2-31, 200 kb/s, 90k tbn, 24 tbc
  
      Stream #0.1(und): Audio: libmp3lame, 44100 Hz, stereo, s16, 200 kb/s
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
    Stream #0.1 -> #0.1
  
  Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height