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• How to use FFMPEG commands

  26 septembre 2013, par Shashank Agarwal

  In android i am making an app in which it will record an video and crop the video from center for doing so i found FFMPEG over google. I followed http://dmitrydzz-hobby.blogspot.in/2012/04/how-to-build-ffmpeg-and-use-it-in.html

  It works fine but i want to know how to use this `ffmpeg -y -i /sdcard/videokit/short.mp4 -vf crop=100:100:0:0 -s 320x240 -r 15 -aspect 3:4 -ab 12288 -vcodec mpeg4 -b 2097152 -sample_fmt s16 /sdcard/videokit/out.mp4

  ` video cropping command and Where to write this command.

  I have tried this (for concatenation just to check about how to use ffmpeg command )

  public class MainActivity extends Activity {
  
  private static native int logFileInfo(String[] args);
  
  String pathOut = "/storage/sdcard/12.mp3";
  
  String pathInM = "/storage/sdcard/23.mp3";
  
  String pathIn = "/storage/sdcard/out.mp3";
  
  @Override
  
  public void onCreate(Bundle savedInstanceState) {
  
      super.onCreate(savedInstanceState);
  
      setContentView(R.layout.activity_main);
  
      String[] args = {"ffmpeg",  "-i", "concat:", pathOut, "|",pathInM ,pathIn};
  
      logFileInfo(args);
  
      //logFileInfo("/storage/sdcard/12.mp3");
  
  }
  
  
  
  static
  
  {
  
      System.loadLibrary("mylib");
  
  }

  But i dont know what to write in mylib.c to execute this.somebody Please help

• vf_fps : use double constants for default/min/max for start_time

  27 août 2013, par Hendrik Leppkes

  vf_fps : use double constants for default/min/max for start_time
  When using AV_NOPTS_VALUE (which expands to INT64_C(0x8000000000000000))
  
  as union initializer for a double field, the c99 converter needs to
  
  interpret this constant when filling the union initializer, and it is
  
  interpreted as a positive value.
  When converting AV_NOPTS_VALUE to a double, MSVC 2010 ends up with
  
  the same positive value as the c99 converter, while MSVC 2012 gets
  
  a negative value.
  This results in an infite loop in various FATE tests on MSVC 2012.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavfilter/vf_fps.c

• m3u8 segmenter not building in centos 6

  29 août 2013, par raheel khadri

  when i try to make it show me error oplease find below error which i am getting

  cc1: warnings being treated as errors
  
  m3u8-segmenter.c: In function ‘add_output_stream’:
  
  m3u8-segmenter.c:58: error: implicit declaration of function ‘avformat_new_stream’
  
  m3u8-segmenter.c:58: error: nested extern declaration of ‘avformat_new_stream’
  
  m3u8-segmenter.c:58: error: assignment makes pointer from integer without a cast
  
  m3u8-segmenter.c: In function ‘main’:
  
  m3u8-segmenter.c:343: error: implicit declaration of   function‘avformat_find_stream_info’
  
  m3u8-segmenter.c:343: error: nested extern declaration of ‘avformat_find_stream_info’
  
  m3u8-segmenter.c:390: error: implicit declaration of function ‘avcodec_open2’
  
  m3u8-segmenter.c:390: error: nested extern declaration of ‘avcodec_open2’
  
  m3u8-segmenter.c:397: error: ‘AVIO_FLAG_WRITE’ undeclared (first use in this function)
  
  m3u8-segmenter.c:397: error: (Each undeclared identifier is reported only once
  
  m3u8-segmenter.c:397: error: for each function it appears in.)
  
  make[1]: *** [m3u8_segmenter-m3u8-segmenter.o] Error 1
  
  make[1]: Leaving directory `/usr/local/src/m3u8-segmenter'
  
  make: *** [all-recursive] Error 1

  Note : i have ffmpeg and all required libraries installed already

  My ffmpeg vesrion below :

  [root@localhost m3u8-segmenter]# ffmpeg -version
  
  FFmpeg version 0.6.5, Copyright (c) 2000-2010 the FFmpeg developers
  
    built on Jan 29 2012 17:53:48 with gcc 4.4.5 20110214 (Red Hat 4.4.5-6)
  
    configuration: --prefix=/usr --libdir=/usr/lib --shlibdir=/usr/lib --mandir=/usr/share/man --incdir=/usr/include --disable-avisynth --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i686 -mtune=atom -fasynchronous-unwind-tables' --enable-avfilter --enable-avfilter-lavf --enable-libdc1394 --enable-libdirac --enable-libfaac --enable-libfaad --enable-libfaadbin --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libx264 --enable-gpl --enable-nonfree --enable-postproc --enable-pthreads --enable-shared --enable-swscale --enable-vdpau --enable-version3 --enable-x11grab
  
    libavutil     50.15. 1 / 50.15. 1
  
    libavcodec    52.72. 2 / 52.72. 2
  
    libavformat   52.64. 2 / 52.64. 2
  
    libavdevice   52. 2. 0 / 52. 2. 0
  
    libavfilter    1.19. 0 /  1.19. 0
  
    libswscale     0.11. 0 /  0.11. 0
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
  FFmpeg 0.6.5
  
  libavutil     50.15. 1 / 50.15. 1
  
  libavcodec    52.72. 2 / 52.72. 2
  
  libavformat   52.64. 2 / 52.64. 2
  
  libavdevice   52. 2. 0 / 52. 2. 0
  
  libavfilter    1.19. 0 /  1.19. 0
  
  libswscale     0.11. 0 /  0.11. 0
  
  libpostproc   51. 2. 0 / 51. 2. 0