Recherche avancée

Sur d’autres sites (6166)

• ffserver + ffmpeg, out rtsp stream : why ffplay cannot play the stream, but movie player can

  18 juillet 2014, par user1914692

  Ubuntu 12.04
  I use ffserver + ffmpeg.

  There are a little revision of the original /etc/ffserver.conf :

  RTSPPort 5454
  
  RTSPBindAddress 0.0.0.0
  
  
  
  # ...
  
  
  
  <stream>
  
  Format rtp
  
  # coming from live feed 'feed1'
  
  Feed feed1.ffm
  
  </stream>

  The command of ffmpeg (Option 1) is :

  ffmpeg -re -i '/usr/share/red5/webapps/oflaDemo/streams/hobbit_vp6.flv'  http://localhost:8090/feed1.ffm

  BTW, if I use Option 2 as below, it does not work :

  ffmpeg -re -i '/usr/share/red5/webapps/oflaDemo/streams/hobbit_vp6.flv'  http://192.168.1.105:8090/feed1.ffm
  
  ## not work:
  
  [http @ 0x21a9c80] HTTP error 404 Not Found
  
  http://192.168.1.105:8090/feed1.ffm: Input/output error

  So now I need to display the stream.
  On the other computer :

  (Option 1) ffplay rtsp://192.168.1.105:5454/test2-rtsp.mpg

  Not work. [Output] rtsp UDP timeout, retrying with TCP.
  Why ?

  (Option 2) movie player : Open location : rtsp ://192.168.1.105:5454/test2-rtsp.mpg
  it works !

• create multiple movie thumbnails using ffmpeg (one at a time) failing

  2 septembre 2013, par Christopher Johnson

  I'm using this small bit of code to create thumbnails of videos being uploaded to my site :

  public static void GetThumbnail(string video, string thumbnail)
  
  {
  
      var cmd = "ffmpeg  -itsoffset -1  -i " + '"' + video + '"' + " -vcodec mjpeg -vframes 1 -an -f rawvideo -s 320x240 " + '"' + thumbnail + '"';
  
      var startInfo = new ProcessStartInfo
  
      {
  
          WindowStyle = ProcessWindowStyle.Hidden,
  
          FileName = "cmd.exe",
  
          Arguments = "/C " + cmd
  
      };
  
  
  
      var process = new Process
  
      {
  
          StartInfo = startInfo
  
      };
  
  
  
      process.Start();
  
  }

  I'm uploading the videos one at a time asynchronously. The first video thumbnail gets created just fine, but each subsequent one does not get created. I've noticed that if I try to delete subsequent videos from the file system, it says it can not delete them because they are in use by ffmpeg. I can delete the first one that finished processing just fine. I have to kill the ffmpeg process from task manager for all of the others that it's holding open. Why is ffmpeg only working the first time through and then holding the video's open in an open process afterwards ?

  I also tried creating multiple thumbnails one at a time from the command prompt and that worked fine (the process does not stay open either).

  What am I missing in my c# code to make sure the process finishes, and then terminates ?

• Increase the bitrate tolerance of ffmpeg for creating screenshots of a movie

  21 septembre 2012, par rekire

  I'm getting the error bitrate tolerance too small for bitrate so far no problem. I know that there are several switches to increase that but nothing works.

  ffmpeg -y -r 1/30 -b:v 999999k -bt 999999k -maxrate 999999k -i in.flv out%03d.jpg

  The source of that commandline is directly from ffmpeg. But that crashes :

  ffmpeg version N-44123-g5d55830 Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Sep  2 2012 20:23:29 with gcc 4.7.1 (GCC)
  
    [...]
  
  Input #0, flv, from 'in.flv':
  
    Duration: 00:05:00.13, start: 0.000000, bitrate: 259 kb/s
  
      Stream #0:0: Video: flv1, yuv420p, 320x240, 1k tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: nellymoser, 22050 Hz, mono, s16
  
  [mjpeg @ 04356860] bitrate tolerance too small for bitrate
  
  [mjpeg @ 04317540] ff_frame_thread_encoder_init failed
  
  Output #0, image2, to 'out%03d.jpg':
  
      Stream #0:0: Video: mjpeg, yuvj420p, 320x240, q=2-31, 200 kb/s, 90k tbn, 0.03 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (flv -> mjpeg)
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  Some ideas what I'm doing wrong ?