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• packets dropping while trying to send video streaming using ffmpeg library via RTP cpp

  1er mars 2018, par Alisa456

  I have a code of a streamer and a receiver written in cpp. I am trying to send packets that contain picture streaming from a video in the streamer (flv video) but in the receiver i get
  these errors
  .I have a sdp file in the receiver that contain the following data :

  v=0
  
  o=- 0 0 IN IP4 127.0.0.1
  
  s=No name
  
  t= 1 1000000
  
  a=tool:libavformat 55.19.104
  
  m=video 1234 RTP/AVP 117
  
  c=IN IP4 127.0.0.1
  
  b=AS:394
  
  a=rtpmap:117 H264/90000

  Does anyone know what is the cause of the problem and the best way to fix it ?

• 3 seconds latency while streaming with Wowza Server

  18 mai 2015, par kaizen_labs

  I’m trying to develop a live streaming application with RTSP protocol.

  On the PC with the Wowza Server, I execute the following command :

  Code :

  ffmpeg -f dshow -i video="Name_Of_My_Cam":audio="Name_Of_My_Microphone" -vcodec
  
  h263p -f rtsp -muxdelay 0.1 rtsp://:1935/live/test

  And I’m trying to play this stream on a VideoView on my Samsung Galaxy Note 3 Lite. Here is the code :

  @Override
  
  protected void onCreate(Bundle savedInstanceState) {
  
      super.onCreate(savedInstanceState);
  
      setContentView(R.layout.activity_main);
  
  
  
      VideoView vv = (VideoView) findViewById(R.id.videoView);
  
      // Receive RTSP video from Wowza Server
  
      vv.setVideoURI(Uri.parse("rtsp://:1935/live/test"));
  
      vv.requestFocus();
  
      vv.start();
  
  }

  I managed to read the video and the sound but it makes 3 secondes (or more...) to start and I keep this delay during all the streaming. It is very annoying because I want to develop a call session.

  Does anybody know how to reduce this delay ? Is it a Wowza issue ?

• Converting powerpoint .mov to .ts for streaming

  12 décembre 2017, par Cyril

  I have a .mov video (powerpoint exported to video) at 0.5 fps, and I want to stream this video :

  • stream server : vlc
  • stream client : omxplayer (video player for Raspberry Pi)

  Currently, I encode every video for streaming like this :

  ffmpeg -y -i video.mov -vcodec libx264 -preset veryfast -g 60 -acodec aac video.ts

  This works fine for any video, except for videos created by powerpoint. Those videos are at 0.5 fps, and it looks like vlc needs at least 10 fps for streaming. So I tried this in order to have 30 fps on the .ts file :

  ffmpeg -y -i video.mov -vcodec libx264 -preset veryfast -g 60 -acodec aac -r 30 video.ts

  But it doesn’t add frames :

  […]
  
  frame=    6 fps=0.0 q=-1.0 Lsize=     193kB time=00:00:06.00 bitrate= 264.0kbits/s speed=9.64x
  
  […]

  Creating a .mp4 file works fine, but can’t be streamed :

  ffmpeg -y -i video.mov -vcodec libx264 -preset veryfast -g 60 -acodec aac -r 30 video.mp4
  
  […]
  
  frame=  360 fps= 52 q=-1.0 Lsize=     314kB time=00:00:11.90 bitrate= 215.9kbits/s dup=354 drop=0 speed=1.71x
  
  […]

  I also tried converting this .mp4 video to a .ts for streaming, but the stream doesn’t work :

  ffmpeg -y -i video.mp4 -vcodec libx264 -preset veryfast -g 60 -acodec aac video.ts

  I found one way to have a working .ts file, but I don’t like it. It implies converting the file to raw yuv file, then converting it again to a h264 .ts file. I don’t like it because the raw yuv file is really big, and I need to specify the height and width of the final file :

  ffmpeg -y -i video.mov -vcodec rawvideo -acodec aac -pix_fmt yuv420p -r 30 video.yuv
  
  ffmpeg -y -f rawvideo -pix_fmt yuv420p -s:v 640x480 -r 30 -i video.yuv -vcodec libx264 -preset veryfast -g 60 -acodec copy video.ts

  So here is my question : is there a simple way to convert this .mov video to a streamable .ts video ?