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• Video frames move fast for few second while resume live feeds FFmpeg

  13 juin 2014, par Tarun Seera

  I am using av_read_pause() for pause the feed and av_Read_play() for resume from current position.
  When its resume video frames move fast for few seconds can anybody tell me how to control this.

• FFmpeg Live streaming, capture card avisynth/graphedit

  19 décembre 2013, par diegonaranjo

  I´m stuck in a problem with a test doing multicast streaming from a Viewcast Osprey 700e HD using ffmpeg.
  The thing is that I´ve to use avisynth(with graphedit) for ffmpeg recognize the card. The streaming has no ending time,
  is a live channel for IPTV.
  The script is working well, but the problem is the avisynth config, because I have to specify the countframe option,
  i think this is for the duration of the clip, but I need an infinity streaming.

  The is script is :

  ffmpeg -i espnhd.avs -rtbufsize 100000k -r 30 -c:v mpeg2video -b:v 5120k -s 1280x720 -g 100 -q:v 2 -c:a ac3 -b:a 256k -f mpegts udp ://239.192.42.61:1234

  The espnhd.avs file is :

  v=directshowsource("espnhdv.GRF", pixel_type="YUV", framecount=1000000, fps=30, audio=False, convertfps=false)
  A=directshowsource("espnhda.GRF", fps=30, framecount=1000000, video=False, convertfps=false)
  AudioDub(V, A)
  loop()

  When i run the application, work fine but the streaming ends when 1000000 frames it´s encoded...
  If i dont specify framecount, ffmpeg doesn´t start with the following error, can´t determine the duration of the clip.

  Is there any way to specify an inifinity duration on avisynth ?

  The streaming stops at 1:57hs. I took the end fo the logs :

  frame=212014 fps= 30 q=4.0 size= 6957018kB time=01:57:54.13 bitrate=8056.4kbits/s dup=0 drop=211 
  
  frame=212029 fps= 30 q=4.0 size= 6958383kB time=01:57:54.64 bitrate=8057.4kbits/s dup=0 drop=211 
  
  frame=212044 fps= 30 q=4.0 size= 6959504kB time=01:57:55.13 bitrate=8058.1kbits/s dup=0 drop=211 
  
  frame=212060 fps= 30 q=4.0 size= 6960692kB time=01:57:55.66 bitrate=8058.9kbits/s dup=0 drop=211 
  
  espnhd.avs: Not enough space
  
  [output stream 0:0 @ 02f02220] EOF on sink link output stream 0:0:default.
  
  [output stream 0:1 @ 02f10c20] EOF on sink link output stream 0:1:default.
  
  No more output streams to write to, finishing.
  
  frame=212069 fps= 30 q=4.0 Lsize= 6961519kB time=01:57:56.00 bitrate=8059.5kbits/s dup=0 drop=211 
  
  
  
  video:6196482kB audio:221125kB subtitle:0 global headers:0kB muxing overhead 8.475312%
  
  424560 frames successfully decoded, 0 decoding errors
  
  [AVIOContext @ 02f8c3e0] Statistics: 0 seeks, 4977161 writeouts
  
  [AVIOContext @ 02f032a0] Statistics: 229 bytes read, 0 seeks

  I really appreciate some help.
  Thanks.

• Tips for encoding a live stream to IIS Media Services (or Azure Live Media Services) with FFMPEG ?

  6 mars 2014, par user3104748

  We're trying to encode assets, either live or static, in a live stream to IIS Media Services using ffmpeg. Can anyone provide pointers for exactly what kinds of parameters we should be using and setting ?

  As part of our test, just to see if we can get things to work, we have a standard plain-old MP4 video static asset that we're trying to stream to the server. It seems to work on the client side, but when we try to view the video on the receiving end, we get nothing.

  Here's an example of the command we're using, where gg.mp4 is the static MP4 video (obviously (hostname) is the name of our host and not the actual word in parenthesis :)...

  ffmpeg -y -re -i gg.mp4 -movflags isml+frag_keyframe -f ismv -threads 0 -c:a libvo_aacenc -ac 2 -b:a 64k -c:v libx264 -preset fast -profile:v baseline -g 48 -keyint_min 48 -map 0:v -b:v:0 477k -s:v:0 368x152 -map 0:v -b:v:1 331k -s:v:1 288x120 -map 0:v -b:v:2 230k -s:v:2 224x92 -map 0:a:0 http://(hostname)/ingest.isml/Streams(video)