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• RTP Streaming with ffmpeg : server streaming, client failing

  27 novembre 2013, par Christoph Kuhr

  I compiled ffmpeg and x264 myself.

  x264 version :

   #define X264_REV 2377
  
   #define X264_REV_DIFF 0
  
   #define X264_VERSION " r2377 1ca7bb9"
  
   #define X264_POINTVER "0.140.2377 1ca7bb9"

  ffmpeg version : 0.11.4
  ffmpeg configuration :

   --enable-x11grab --enable-pthreads --enable-libfaac --enable-libxvid --enable-libx264 --enable-libv4l2 --enable-libmp3lame --enable-libpulse --enable-gpl --enable-nonfree --disable-yasm

  streaming server call :

  ffmpeg -f x11grab -s 1600x900 -framerate 50 -i :0.0 -vcodec libx264 -threads 4 -preset ultrafast -crf 0 -q:v 1 -b:v 8M -an -f rtp rtp://192.168.188.30:8710
  
  
  
  ...
  
  
  
   Output #0, rtp, to 'rtp://192.168.188.30:8710':
  
    Metadata:
  
      encoder         : Lavf54.6.100
  
      Stream #0:0: Video: h264, yuv420p, 1600x900, q=-1--1, 8000 kb/s, 90k tbn, 50 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo -> libx264)
  
  SDP:
  
  v=0
  
  o=- 0 0 IN IP4 127.0.0.1
  
  s=No Name
  
  c=IN IP4 192.168.188.30
  
  t=0 0
  
  a=tool:libavformat 54.6.100
  
  m=video 8710 RTP/AVP 96
  
  b=AS:8000
  
  a=rtpmap:96 H264/90000
  
  a=fmtp:96 packetization-mode=1

  Everything looks good so far...

  Now the problem.
  I create foo.sdp from the SDP output of the server and try to playback the stream with ffmpeg ffplay foo.sdp. ffplay fails with the following error :

   [sdp @ 0x7f5e0c0008c0] decoding for stream 0 failed
  
   [sdp @ 0x7f5e0c0008c0] Could not find codec parameters (Video: h264)
  
   [sdp @ 0x7f5e0c0008c0] Estimating duration from bitrate, this may be inaccurate
  
   gameserver.sdp: could not find codec parameters

  If I try the same with VLC, it also fails, but with the different error :

    [0x7f3278c045b8] live555 demux error: no data received in 10s, aborting

  Look like different reasons. But I could not solve either. Does anyone have a clue ?

• FFmpeg HLS streaming - Why the program date time of older segment changing when re-streaming after discontinuity

  9 novembre 2020, par Suriya Krish

  Following is the ffmpeg command to stream the data.

  


  ffmpeg -re -f avfoundation 
-framerate 30 -i 0 
-codec:v h264_videotoolbox -x264-params keyint=120:scenecut=0 
-codec:a copy -f hls 
-hls_list_size 60 
-hls_time 10 
-hls_flags delete_segments 
-hls_flags +append_list 
-hls_flags +discont_start 
-hls_flags +program_date_time 
-strftime 1 
-strftime_mkdir 1 
-hls_segment_filename 
'%Y%m%dT%H%M%S%z.ts' playlist.m3u8


  


  Following is the playlist.m3u8 content which generated for few seconds.

  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:10
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-DISCONTINUITY
#EXT-X-DISCONTINUITY
#EXTINF:10.000000,
#EXT-X-PROGRAM-DATE-TIME:2020-11-09T22:07:53.000+0530
20201109T220753+0530.ts
#EXTINF:10.000000,
#EXT-X-PROGRAM-DATE-TIME:2020-11-09T22:08:03.000+0530
20201109T220803+0530.ts
#EXT-X-ENDLIST


  


  When the re-stream happens(in case of restarting the streaming service), the program date time of older segments(before #EXT-X-DISCONTINUITY) also get changed like below, which is unexpected.

  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:10
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-DISCONTINUITY
#EXT-X-DISCONTINUITY
#EXTINF:10.000000,
#EXT-X-PROGRAM-DATE-TIME:2020-11-09T22:12:50.633+0530
20201109T220753+0530.ts
#EXTINF:10.000000,
#EXT-X-PROGRAM-DATE-TIME:2020-11-09T22:13:00.633+0530
20201109T220803+0530.ts
#EXT-X-DISCONTINUITY
#EXTINF:10.000000,
#EXT-X-PROGRAM-DATE-TIME:2020-11-09T22:13:12.000+0530
20201109T221312+0530.ts
#EXTINF:5.400000,
#EXT-X-PROGRAM-DATE-TIME:2020-11-09T22:13:22.000+0530
20201109T221322+0530.ts
#EXT-X-ENDLIST


  


  Why the program date time of older segment should change ? Should we add any arguments in ffmpeg command to handle this ?

  


• Ffmpeg PNG Pictures to Video Background Issue

  6 octobre 2014, par Ryan Bansi

  I am trying to create an FLV video from a set of png images. The thing is that I’ve already removed the background of the said images with ImageMagick and use ffmpeg to create it to video. The problem is that after compiling, when I look at the video the background is there when it was supposed to have already been removed. Does anybody have any idea what might be the cause of this ?

  This is the ffmpeg code I am using :

  ffmpeg -r 10 -s 1920x1080 -i extracted_images\images%5d.png  test.flv