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• FFMPEG with SoX : configure : error : cannot find ffmpeg

  17 janvier 2014, par Alberto Megía

  So I am trying to install in my Ubuntu Desktop 12.04 SoX with FFMPEG support for m4a files.

  I have followed this instructions to install FFMPEG, installing only certain encoders. Finally, this is my set up :

  ffmpeg version git-2014-01-17-3ca7085 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Jan 17 2014 12:36:01 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
    configuration: --prefix=~/ffmpeg_build --extra-cflags=-I~/ffmpeg_build/include --extra-ldflags=-L~/ffmpeg_build/lib --bindir=~/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-nonfree
  
    libavutil      52. 62.100 / 52. 62.100
  
    libavcodec     55. 48.101 / 55. 48.101
  
    libavformat    55. 23.103 / 55. 23.103
  
    libavdevice    55.  5.102 / 55.  5.102
  
    libavfilter     4.  1.100 /  4.  1.100
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Hyper fast Audio and Video encoder

  Then, I wget SoX 14.4.1 version and try to configure with FFMPEG support like this :

  ./configure --with-ffmpeg

  But I get this error :

  checking for FFMPEG... no
  
  checking libavformat/avformat.h usability... no
  
  checking libavformat/avformat.h presence... no
  
  checking for libavformat/avformat.h... no
  
  checking ffmpeg/avformat.h usability... no
  
  checking ffmpeg/avformat.h presence... no
  
  checking for ffmpeg/avformat.h... no
  
  configure: error: in `~/sox-14.4.1':
  
  configure: error: cannot find ffmpeg
  
  See `config.log' for more details

  So I try to set PKG_CONFIG_PATH environment variable :

  PKG_CONFIG_PATH=~/ffmpeg_build/lib/pkgconfig
  
  ./configure --with-ffmpeg

  Getting :

  checking for FFMPEG... yes
  
  checking libavformat/avformat.h usability... yes
  
  checking libavformat/avformat.h presence... yes
  
  checking for libavformat/avformat.h... yes
  
  checking for av_open_input_file in -lavformat... no
  
  configure: error: in `~/sox-14.4.1':
  
  configure: error: cannot find ffmpeg
  
  See `config.log' for more details

  Checking 'config.log' I see the following error :

  | #define HAVE_LIBAVFORMAT_AVFORMAT_H 1
  
  | /* end confdefs.h.  */
  
  |
  
  | /* Override any GCC internal prototype to avoid an error.
  
  |    Use char because int might match the return type of a GCC
  
  |    builtin and then its argument prototype would still apply.  */
  
  | #ifdef __cplusplus
  
  | extern "C"
  
  | #endif
  
  | char av_open_input_file ();
  
  | int
  
  | main ()
  
  | {
  
  | return av_open_input_file ();
  
  |   ;
  
  |   return 0;
  
  | }
  
  configure:15862: result: no
  
  configure:15935: error: in `~/sox-14.4.1':
  
  configure:15937: error: cannot find ffmpeg

  What am I missing here ?
  Thx !

• How can I find video rotation and rotate the clip accordingly using moviepy ?

  26 mars 2017, par Gloin

  I’m using moviepy to import some videos, but the videos that should be in portrait mode are imported in landscape. I need to check whether the rotation has been changed, and if it has, rotate it back.

  Is this functionality built into moviepy ? If not, how else can I check it ?

• How do I find the pixel format of an image given the raw data ?

  29 décembre 2016, par Gokul NC

  I have a raw file which is definitely a picture..
  (Here it is)
  (It is actually a payload that’s loaded by a SoC when it’s booted, to display logo of manufacturer)

  How do I recognize what pixel format it is, so I can change/edit the picture ??

  I don’t know the resolution of the picture.. (might be 720x1280px)
  (Also, the first 512bytes maybe the file header, so maybe that’s supposed to be skipped)

  Is there any way I can detect/recognize the format using some tools like ffmpeg ?
  Or how can I do it manually ?