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• Apple HLS with ffmpeg and mediastreamsegmenter and vlc

  6 août 2015, par user3387312

  I’m trying to stream using a ffmpeg stream from a windows box. Here is the command I’m running on the windows box

  ffmpeg -f dshow -i audio=”Wave In 2 32130101 (Orban Optim” -acodec libmp3lame -ab 64k -f mpegts udp ://172.30.16.181:2222 ?pkt_size=188 ?buffer_size=128000

  This part works and I’m able to listen to it on my mac via VLC and I’m streaming it out from VLC to port 20103

  but when I use mediasegmenter
  mediastreamsegmenter -s 3 -f /Users/vickkrish/ 127.0.0.1:2222

  This is what happens
  Mar 6 2014 04:11:02.926 : audio pid set at 44
  Mar 6 2014 04:11:03.165 : audio pid change to 44
  Mar 6 2014 04:11:03.328 : audio pid change to 44
  Mar 6 2014 04:11:03.583 : audio pid change to 44
  Mar 6 2014 04:11:03.745 : audio pid change to 44
  Mar 6 2014 04:11:03.989 : audio pid change to 44
  Mar 6 2014 04:11:04.151 : audio pid change to 44
  Mar 6 2014 04:11:04.316 : audio pid change to 44
  Mar 6 2014 04:11:04.492 : audio pid change to 44
  Mar 6 2014 04:11:04.740 : audio pid change to 44
  Mar 6 2014 04:11:04.887 : audio pid change to 44
  Mar 6 2014 04:11:05.175 : audio pid change to 44
  Mar 6 2014 04:11:05.338 : audio pid change to 44
  Mar 6 2014 04:11:05.582 : audio pid change to 44

  and no .ts files are created.

• How to start ffprobe with Windows PowerShell

  7 mars 2014, par sebastian

  I am using Zeranoes FFmpeg Builds for Windows and I can start the ff-prompt without installing anything. But how do I start ff-prompt.bat with Windows PowerShell ? I have tried a few things like Invoke-Expression or changing the $env:Path but nothing seems to work, because all I get is the message

  "C :\Users\Administrator>ECHO OFF

  bin\ffmpeg.exe could not be found."

  Is it even possible to start ff-prompt with PowerShell ? Every suggestion / solution is more than welcome.

  My goal is to have a solution that works like this here :
  http://spreadys.wordpress.com/2012/12/03/ffprobe-and-windows-powershell/

  but I want to do that automatically for all my clips, thats why I need to start ffprobe with powershell.

  ---

  ECHO OFF
  
  REM FF Prompt 1.1
  
  REM Open a command prompt to run ffmpeg/ffplay/ffprobe
  
  REM Copyright (C) 2013  Kyle Schwarz
  
  
  
  TITLE FF Prompt
  
  
  
  IF NOT EXIST bin\ffmpeg.exe (
  
    CLS
  
    ECHO bin\ffmpeg.exe could not be found.
  
    GOTO:error
  
  )
  
  
  
  CD bin || GOTO:error
  
  PROMPT $G
  
  CLS
  
  ffmpeg -version
  
  SET PATH=%CD%;%PATH%
  
  ECHO.
  
  ECHO For help run: ffmpeg -h
  
  ECHO For formats run: ffmpeg -formats ^| more
  
  ECHO For codecs run: ffmpeg -codecs ^| more
  
  ECHO.
  
  ECHO Current directory is now: "%CD%"
  
  ECHO The bin directory has been added to PATH
  
  ECHO.
  
  
  
  CMD /F:ON /Q /K
  
  GOTO:EOF
  
  
  
  :error
  
    ECHO.
  
    ECHO Press any key to exit.
  
    PAUSE >nul
  
    GOTO:EOF

  Okay I tried something a little bit different this time :

  $env:Path = ';C:\Users\Administrator\bin\'
  
  $title = "A_Day_for_Cake_and_Accidents"
  
  Start-Process ff-prompt.bat -ArgumentList "ffprobe -show_streams -select_streams v -print_format xml -count_frames C:\Users\Administrator\Desktop\dcp_bearbeitet\$title\$title.mov > C:\Users\Administrator\Desktop\dcp_bearbeitet\$title\totalframes.xml"

  This creates a file called "totalframes.xml" but without the needed information, the only thing I get is :

  C :\Users\Administrator>ECHO OFF
  ffmpeg version N-60959-g669043d
  built on Feb 27 2014 22:01:58 with gcc 4.8.2 (GCC)
  configuration : —enable-gpl —enable-version3 —disable-w32threads —enable-avisynth —enable-bzlib —enable-fontconfig —enable-frei0r —enable-gnutls —enable-iconv —enable-libass —enable-libbluray —enable-libcaca —enable-libfreetype —enable-libgsm —enable-libilbc —enable-libmodplug —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenjpeg —enable-libopus —enable-librtmp —enable-libschroedinger —enable-libsoxr —enable-libspeex —enable-libtheora —enable-libtwolame —enable-libvidstab —enable-libvo-aacenc —enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libwavpack —enable-libx264 —enable-libx265 —enable-libxavs —enable-libxvid —enable-zlib
  libavutil 52. 66.100 / 52. 66.100
  libavcodec 55. 52.102 / 55. 52.102
  libavformat 55. 33.100 / 55. 33.100
  libavdevice 55. 10.100 / 55. 10.100
  libavfilter 4. 2.100 / 4. 2.100
  libswscale 2. 5.101 / 2. 5.101
  libswresample 0. 18.100 / 0. 18.100
  libpostproc 52. 3.100 / 52. 3.100
  For help run : ffmpeg -h
  For formats run : ffmpeg -formats | more
  For codecs run : ffmpeg -codecs | more
  Current directory is now : "C :\Users\Administrator\bin"
  The bin directory has been added to PATH

  So basically the console pops up, writes this standard text and does not use my commands which I stated in -Argument-List . I do not have a clue why it is ignoring most of my commands, except for writing everything in a XML file.

• Cortex-A7 instruction cycle timings

  15 mai 2014, par Mans — ARM

  The Cortex-A7 ARM core is a popular choice in low-power and low-cost designs. Unfortunately, the public TRM does not include instruction timing information. It does reveal that execution is in-order which makes measuring the throughput and latency for individual instructions relatively straight-forward. The table below lists the measured issue cycles … Continue reading →