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• Wrapping an existing RTP stream with RTSP

  12 janvier 2015, par Neverbirth

  I have a RTP multicast stream from ffmpeg that requires users to use external SDP files, as this sometimes becomes a problem I was thinking of wrapping the stream using RTSP.

  I have an application that already makes some management for the RTP stream, so it would be useful to have the RTSP wrapper inside it as well, although I don’t want the wrapper to do anything beyond delivering the SDP information. Right now I’d say I’m correctly delivering the SDP information (otherwise it’s stuck in that request), however I’m not getting any PLAY command, the player is stuck after the SETUP request, so I guess my reply is wrong, but after testing many different values for the Transport header I haven’t been able to get anything beyond this point.

  This is the SDP :

  v=0
o=- 0 0 IN IP4 127.0.0.1
s=No Name
c=IN IP4 236.0.0.1
t=0 0
a=tool:libavformat 56.7.102
m=video 2000 RTP/AVP 96
b=AS:500
a=rtpmap:96 H264/90000
a=fmtp:96 packetization-mode=1

  This is a sample SETUP request from VLC :

  SETUP rtsp://127.0.0.1:34343/live.sdp/ RTSP/1.0
CSeq: 4
User-Agent: LibVLC/2.1.5 (LIVE555 Streaming Media v2014.05.27)
Transport: RTP/AVP;multicast;client_port=2000-2001

  And one of many replies I’ve tried :

  RTSP/1.0 200 OK
CSeq: 4
Transport: RTP/AVP;multicast;client_port=2000-2001;source=236.0.0.1;port=2000-2001
Session: 0456804596

  I’ve tried using destination instead of source, server_port instead of port, also, although the RTP multicast port is 2000, I’ve seen the streaming is also using other ports like 57927 and 57928, so I’ve tried those ones as well, etc.

• Problems accessing codecs with ggplot and gganimate

  19 décembre 2016, par noLongerRandom

  Using gganimate. Can’t figure out how to properly access functionality of ffmpeg, specifically I want to change the codec I’m using in the video file I’m outputting.

  # load packages
  
  library(ggplot)
  
  library(animation)
  
  library(gganimate)
  
  
  
  # Here's my data.frame
  
  myDf <- data.frame(
  
      year = c(1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014), 
  
      bottom50 = c(0.195, 0.191, 0.187, 0.192, 0.196, 0.205, 0.207, 0.210, 0.209, 0.204, 0.203, 0.204, 0.205, 0.203, 0.202, 0.200, 0.200, 0.201, 0.199, 0.195, 0.190, 0.183, 0.179, 0.179, 0.177, 0.172, 0.169, 0.169, 0.168, 0.166, 0.158, 0.159, 0.158, 0.154, 0.151, 0.148, 0.149, 0.148, 0.146, 0.149, 0.148, 0.145, 0.142, 0.138, 0.135, 0.137, 0.137, 0.136, 0.130, 0.127, 0.123, 0.127, 0.125), top1 = c(0.126, 0.127, 0.129, 0.128, 0.126, 0.123, 0.122, 0.115, 0.110, 0.111, 0.111, 0.109, 0.106, 0.105, 0.105, 0.107, 0.108, 0.111, 0.107, 0.110, 0.112, 0.115, 0.125, 0.125, 0.122, 0.133, 0.149, 0.145, 0.145, 0.139, 0.150, 0.146, 0.147, 0.153, 0.160, 0.166, 0.169, 0.177, 0.183, 0.173, 0.171, 0.172, 0.183, 0.194, 0.201, 0.199, 0.195, 0.185, 0.198, 0.196, 0.208, 0.196, 0.202)
  
  )
  
  
  
  #Basic plot
  
  p <- ggplot(myDf, aes(x = year, y = bottom50, frame = year)) + 
  
      geom_line(color = "dodgerblue") + 
  
      geom_line(aes(y = top1), color = "darkred")

  The non-animated version gets me what I want :

  

  And I get an animation version output to video with :

  gganimate(p, interval = .1, title_frame = FALSE, "income.mp4")

  That’s fine, but I want to change some the output parameters, specifically : alter the dimensions, the frame rate, and use a different codec.

  # change some of the options
  
  ani.options(ani.height = 1080, ani.width = 1920, 
  
              interval = 0.04166667, other.opts = "-vcodec qtrle -f mov")
  
  # re-animate
  
  gganimate(p, title_frame = FALSE, "income.mov")

  That gives me the following error :

  Error in animation_saver(saver, filename) : 
  
    Don't know how to save animation of type mov

  I’m using ’.mov’ as my file extension because I’m trying to change to the Animation codec (so it’s no longer a .mp4 wrapper). I’ve got ffmpeg installed, so this is probably a syntax issue. But the documentation isn’t very clear here ; gganimate doesn’t have any documentation on changing codecs (or outputting any video besides an mp4), and the animation package is light on specifics as well.

• Metadata is not showing ffmpeg C++

  18 août 2015, par Kaidul Islam

  I am muxing h264 encoded video data and PCM g711 encoded audio data into a .mov media container. I am trying to write metadata on header but the metadata is not showing when I go to file->right click->properties->details on windows and likewise in Ubuntu. This is my code -

  // Instead of creating new AVDictionary object, I also tried following way
  
  // stated here: http://stackoverflow.com/questions/17024192/how-to-set-header-metadata-to-encoded-video 
  
  // but no luck
  
  AVDictionary* pMetaData = m_pFormatCtx->metadata;
  
  av_dict_set(&pMetaData, "title", "Cloud Recording", 0);
  
  av_dict_set(&pMetaData, "artist", "Foobar", 0);
  
  av_dict_set(&pMetaData, "copyright", "Foobar", 0);
  
  av_dict_set(&pMetaData, "filename", m_sFilename.c_str(), 0);
  
  time_t now = time(0);
  
  struct tm tStruct = *localtime(&now);
  
  char date[100];
  
  strftime(date, sizeof(date), "%c", &tStruct); // i.e. Thu Aug 23 14:55:02 2001
  
  av_dict_set(&pMetaData, "date", date, 0);
  
  av_dict_set(&pMetaData, "creation_time", date, 0);
  
  av_dict_set(&pMetaData, "comment", "This video has been created using Eyeball MSDK", 0);
  
  
  
  // ....................
  
  // .................
  
  
  
  /* write the stream header, if any */
  
  int ret = avformat_write_header(m_pFormatCtx, &pMetaData);

  I also tried to see if the file contains any metadata using mediainfo and exiftools in linux. Also I tried ffmpeg -i output.mov but no metadata is shown.

  Whats the problem ? Is the flags value 0 in av_dict_set okay ? DO I need to set different flags for different platform (windows/linux) ?

  I saw this link and it stated that for windows, I have to use id3v2_version 3 and -write_id3v1 1 to make metadata working. If so, how can I do this in C++ ?