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• mediastreamsegmenter stops sending id3 metadata using HLS

  9 mai 2013, par alawson421

  I am using a combination of ffmpegand Apple's mediastreamsegmenter and id3taggenerator to create a HLS stream with metadata (ID3) embedded in it. I have all of the applications running and am able to retrieve the metadata out of the stream on the client side, but the issue is that after what seems like a random amount of time, the client stops receiving metadata on the stream.

  Here is what I have working now :

  This is the ffmpeg and mediastreamsegmenter part :

  ffmpeg -i udp://@:5010 -c:v libx264 -crf:v 22 -b:v 500k -preset:v veryfast -c:a libfdk_aac -b:a 64k -f mpegts - | mediastreamsegmenter -b http://localhost/stream -f /usr/local/nginx/html/stream/ -t 10 -s 4 -S 1 -D -y id3 -m -M 4242 -l log.txt

  This is taking a udp stream on the localhost on port 5010 and encoding the video and audio to H.264 and AAC, respectively. It is pipping the MPEG-2 transport stream segments to the mediastreamsegmenter, which in turn is generating the .M3U8 file and associated .ts files and placing them on a NGINX webserver. The mediastreamsegmenter is also listening on port 4242 for tcp traffic from the id3taggenerator which I will show how I am using it now :

  id3taggenerator -text '{"x":"12","y":"36"}' -a localhost:4242

  As you can see, I am sending some simple x-y coordinates in JSON as text to the mediastreamsegmenter listening on port 4242. I am actually using a Python script to send some test data at the moment. Here is the script :

  #!/usr/local/bin/python3
  
  from subprocess import call
  
  from time import sleep
  
  
  
  for i in range(0, 10):
  
      for j in range(0, 10):
  
          x = str(20 * i)
  
          y = str(20 * j)
  
          print("X: " + x + " - Y: " + y)
  
          call(["id3taggenerator", "-text", "{\"x\":\"" + x + "\",\"y\":\"" + y + "\"}", "-a", "localhost:4242"])
  
          sleep(1.0)

  This script is just sending a bunch of x-y coordinates using the id3taggenerator CLI. I have adjusted the sleep amount from 0.1 to 15 and it doesn't seem to make any difference. The client application that is getting the metadata out of the stream only prints out anywhere from 4 to 35 points, but never has it ever received all of the x-y coordinates.

  I am wondering if there is a limit to the amount of metadata that can sent per frame, but I cannot seem to find anything that specifies a hard-limit value for any of these tools...

• avcodec/dca_parser : export profile information

  10 juillet 2017, par foo86

  avcodec/dca_parser : export profile information
  Permits applications to access DTS profile information without having to
  
  decode a frame.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavcodec/dca_parser.c

• Batch screenshots with FFmpeg

  20 juillet 2017, par cCanuck

  I have this bat file that works with another software and I would like to modify it to work with FFmpeg but I haven’t been able to get the syntax or arguments correct

  I essentially have a series of 1hr videos on an external HDD I want to extract an screenshot every 15mins to folder on my computer. I could do it successfully with FFmpeg from the CMD but not in a bat file.

  @echo off
  
  pause
  
  
  
  FOR /F "tokens=*" %%A IN ('dir E:\BIW\*.asf /b') DO "c:\Program Files (x86)\FrameShots3\fsconsole.exe" -ms 900000 -width 1920 -height 1080 -filetype JPEG -filename BIW_ -filecounter 0000 "E:\BIW\%%A" "C:\timelapse\BIW\"
  
  pause