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• How would I use ffmpeg to download this stream ?

  2 novembre 2015, par amos

  I want to download this http://webcast.mit.edu/spr2014/csail/12apr14/ video

  I’ve downloaded the smil file, installed ffmpeg, however I don’t know which url to use. Moreover, it may need flash authentication which I don’t know how to do either.

  smil :

  <smil>
  
    
  
      
  
    
  
    
  
      <switch>
  
        <video></video>
  
        <video></video>
  
       </switch>
  
    
  
  </smil>

  Please help me with the exact command I could use.

• FFmpeg error message when processing

  19 avril 2013, par FlyingCat

  Hi I am using FFmpeg to get the image from several video files.

  I got my ffmpeg codes ready but I got the following error when I exec my codes.

  ffmpeg version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
  
  built on Apr  2 2013 17:02:36 with gcc 4.6.3
  
  
  
  *** THIS PROGRAM IS DEPRECATED ***
  
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  
  
  
  //files info...
  
  //files info...
  
  
  
  Incompatible pixel format 'yuv420p' for codec 'mjpeg', auto-selecting format 'yuvj420p'
  
  
  
  //file info...
  
  
  
  [buffer @ 0x1513c40] Buffering several frames is not supported. Please consume all available frames before adding a new one.
  
   Last message repeated 75 times
  
  
  
  [image2 @ 0x1513460] Could not open file : /test/project
  
  av_interleaved_write_frame(): Input/output error

  I only show the error messages that have color highlighted.

  My codes

                 $ffmpeg ="/usr/bin/ffmpeg";
  
  
  
                 $image_source_path = '/test/project/test.mp4';
  
                 $ALL_PLACE_WIDTH = 300;
  
                 $ALL_PLACE_HEIGHT = 300;
  
  
  
                 $image_cmd = " -r 1 -ss 00:00:10 -t 00:00:01 -s ".$ALL_PLACE_WIDTH."x".$ALL_PLACE_HEIGHT."   -f image2 " ;
  
  
  
                 $dest_image_path = '/test/project';
  
  
  
                 $str_command= $ffmpeg  ." -i " . $image_source_path . $image_cmd .$dest_image_path;
  
                 shell_exec($str_command);

  It seems my linux want to me switch avconv. I am not sure how to fix these errors. Can someone give me a hint about it ? Thanks so much !

• Desktop streaming to Wowza server using ffmpeg

  24 avril 2013, par Gergely Lukacsy

  Recently, I'm trying to utilize ffmpeg for streaming live desktop screen to a Wowza media server.

  I have partial success on the subject so far :

  I've managed to record desktop screen using the UScreenCapture directx dshow filter, and I'm also able to send this record to the server.
  However, when I'm trying to send the screen directly to the server, it fails every time. The player is buffering pretty slowly, and shows a blank screen when it's done (the counter keeps counting).

  So, here are the working methods

  for recording screen :

  ffmpeg -f dshow -i video="UScreenCapture" -r 25 -vcodec libx264 output.flv

  and for streaming video :

  ffmpeg -re -i  -map 0 -c copy -vbsf h264_mp4toannexb -f mpegts udp://stream.server.xyz:52000?pkt_size=1024

  And this is the code I'm using :

  ffmpeg -f dshow -i video="UScreenCapture" -s width x height -r framerate -vcodec libx264 -pix_fmt yuv420p -b:v bitrate -an -vbsf h264_mp4toannexb -f mpegts udp ://your.destination.url:PORTNUMBER ?pkt_size=some_bytes

  As far as I can remember, it worked well before I upgraded wowza.

  Some additional info :

  • OS : win7 sp1 64bit
  • ffmpeg N-49610-gc2dd5a1 (Zeranoe FFmpeg build 2013 Feb 5)
  • UScreenCapture : x64 Edition Version 2.0.14
  • Wowza 3.5.2 running on a Debian linux 2.6.32-5-amd64
  • Flowplayer : 3.2.15

  Looking trough the Wowza log files, something caught my attention. It seems when I'm streaming desktop screen, the server somhow gets uncomplete packets, but when I'm streaming a video file, the error doesn't occurs.

  RTPDePacketizerMPEGTS.handleRTPPacket
  
  WARN server comment 2013-04-11 11:26:24 - - - - - 152629.665 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
  
  WARN server comment 2013-04-11 11:26:27 - - - - - 152632.782 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
  
  WARN server comment 2013-04-11 11:26:31 - - - - - 152636.383 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
  
  WARN server comment 2013-04-11 11:26:38 - - - - - 152643.484 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
  
  WARN server comment 2013-04-11 11:26:47 - - - - - 152653.088 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
  
  WARN server comment 2013-04-11 11:26:52 - - - - - 152657.587 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
  
  WARN server comment 2013-04-11 11:26:56 - - - - - 152661.624 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
  
  WARN server comment 2013-04-11 11:27:05 - - - - - 152670.805 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472

  What causes this error ? Any ideas ?

  Thanks in advance !