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• Using FFMPEG library with iPhone SDK for video encoding

  21 juin 2015, par user203349

  I need to encode several pictures shot by the iphone camera into a mp4 video file and I know FFMPEG can do this (the application TimeLapser and ReelMoments do it already). I plan to use this in my app iMotion (available in the appstore).

  I successfully install and compile the ffmpeg for the iphone SDK with this link :
  http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2009-October/076618.html

  But now I’m stuck here in my XCode project. What should I do next to use the FFMPEG library for video encoding ? The Apple documentation about external library using is very light and I just can find any tutorial on the web wich explain how to do this.

  If anybody can help me, I would be very grateful..`

  Thanks

  Aurelien Potier

• Removing Silence from m4a files using ffmpeg

  27 juin 2015, par Tejas Shah

  I have an audio file which has both leading and trailing silence and with the following specifics :

  Codec : MPEG AAC Audio (mp4a) Channels : Stereo Sample rate : 44100 Hz Bitrate : 253 kbps

  I want to remove the silences AND keep the quality intact.

  So far I’ve tried

  ffmpeg -i 1.m4a -af silenceremove=1:0.5:0:1:0.5:0 2.m4a 

  This is supposed to remove both the leading and trailing silences.
  But for some reason it doesn’t remove the trailing silence. This seems to be a recurring problem. Found the following on another forum.

  http://ffmpeg-users.933282.n4.nabble.com/How-to-delete-digital-silence-tp4667256p4667356.html

  Also, ffmpeg reduces the bitrate to 128kbps. This I could fix by adding -ab 253k and making the command :

  ffmpeg -i 1.m4a -af silenceremove=1:0.5:0:1:0.5:0 -ab 253k 3.m4a 

  Now the problem is that the trailing silence isn’t removed and when I want to process a batch of files I can’t use the same bitrate (like 253kbps ) for every file. I’d like to know how VBR could be used for this case.

  I know I can use sox and use the silence and reverse features to trim the silences.

  http://digitalcardboard.com/blog/2009/08/25/the-sox-of-silence "Example 3 in this post"

  But sox has the following problems :

  1. It can’t handle m4a files, I had to convert all files to mp3.

  2. When using the silence filter in sox it caps the bitrate at 128kbps.

     sox 1.mp3 2.mp3 silence 1 0.5 1% reverse silence 1 0.5 1% reverse

• installing and using ffmpeg-php in my wamp apache

  6 mars 2016, par sonam Sharma

  hey there i am developing a video sharing site and i need to change the video format and get its thumbnail etc i know this can be done by ffmpeg-php library.

  but i have never used any php lib before .
  i have successfully installed ffmpeg to my system (laptop) i can check it by typing library ffmpeg -version to my comand prompt it says something like this

    Microsoft Windows [Version 6.1.7600]
  
  Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
  
  
  
     C:\Windows\system32>ffmpeg -version
  
    ffmpeg version N-73818-g9ebe041 Copyright (c) 2000-2015 the FFmpeg developers
  
      built with gcc 4.9.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --      enable-avis
  
    ynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable
  
     -iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --en
  
   able-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-lib
  
       ilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable
  
   -libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enab
  
      le-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enabl
  
     e-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc -
  
       -enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-
  
      libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enabl
  
     e-decklink --enable-zlib
  
    libavutil      54. 28.100 / 54. 28.100
  
    libavcodec     56. 49.101 / 56. 49.101
  
    libavformat    56. 40.101 / 56. 40.101
  
   libavdevice    56.  4.100 / 56.  4.100
  
   libavfilter     5. 25.100 /  5. 25.100
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
     libpostproc    53.  3.100 / 53.  3.100

  but i am having problem with accessing the library by my php code i think i have’t installed it to my php module

  here is what my wamp shows me

    Server Configuration
  
    Apache Version :
  
    2.4.9   - Documentation
  
    PHP Version :
  
     5.5.12   - Documentation
  
     Server Software:
  
      Apache/2.4.9 (Win64) PHP/5.5.12
  
         Loaded Extensions :
  
              apache2handlerbcmathbz2calendarcom_dotnetCorectypecurlda
  
       tedomeregexiffileinfofil[![enter image description here][1]][1]terftpgdgettextgmphashiconvimapjsonlib
  
        xmlmbstringmcryptmhashmysqlmysqlimysqlndod
  
        bcopensslpcrePDOpdo_mysqlpdo_sqlitePharReflectio
  
       nsessionshmopSimpleXMLsoapsocket    sSPLsqlite3standardtokenizerwddxxdebugxmlxmlreaderxmlrpcxmlwriterxslzipzlib
  
         MySQL Version :
  
         5.6.17  -  Documentation

  if possible please tell me the next step so that i can access the ffmpeg lib from my php code .
  a little help is also appreciated.
  1.please tell me any link availabe to get the ffmpeg-php module and how to installl it
  2.how to access the module/lib from my code justa small code example.

  THANK YOU.