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• OpenCV 3.0.0 make error with FFMPEG

  24 mars 2016, par Ujjwal Aryan

  I have been using OpenCV for a while. However I have recently changed my system to a cluster where I do not have any admin permission. The problem is like this :

  In my home folder, I installed FFMPEG (latest stable version available on ffmpeg site). I installed it in $HOME, and so in $HOME/lib there are the library files installed. For more information I compiled FFMPEG with following options :

  ./configure --prefix=$HOME --enable-shared --enable-pic

  I then downloaded the latest stable version of OpenCV 3.0.0 and configured it using ccmake. When I try to make -j8, it gives me the following error.

   Scanning dependencies of target opencv_videoio
  
  [ 63%] [ 63%] [ 63%] [ 63%] [ 63%] [ 63%] Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap.cpp.o
  
  Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_mjpeg_decoder.cpp.o
  
  Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_images.cpp.o
  
  Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_v4l.cpp.o
  
  Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_mjpeg_encoder.cpp.o
  
  Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_ffmpeg.cpp.o
  
  In file included from /home/uujjwal/libraries/opencv-nogpu/opencv-3.0.0/modules/videoio/src/cap_ffmpeg.cpp:45:0:
  
  /home/uujjwal/libraries/opencv-nogpu/opencv-3.0.0/modules/videoio/src/cap_ffmpeg_impl.hpp:1546:71: error: use of enum 'AVCodecID' without previous declaration
  
  /home/uujjwal/libraries/opencv-nogpu/opencv-3.0.0/modules/videoio/src/cap_ffmpeg_impl.hpp:1556:83: error: use of enum 'AVCodecID' without previous declaration
  
  make[2]: *** [modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_ffmpeg.cpp.o] Error 1
  
  make[2]: *** Waiting for unfinished jobs....

  However without ffmpeg support it works fine. However I need ffmpeg support due to the nature of my work.

  In trying to resolve the problem, I tried installing OpenCV 2.4.11 but it also gave this error. The latest GIT version does not give me this error but rather an error a part of which goes like this

  Linking CXX shared library ../../lib/libopencv_highgui.so /usr/bin/ld: /home/matheus/ffmpeg_build/lib/../lib/libavcodec.a(avpacket.o): relocation R_X86_64_32 against `.rodata.str1.1' can not be used

  I have pasted the above error from another unresolved question online and so the folder names are different but the relocation error is exactly the same.

  In trying to resolve the problem I searched and found the following link http://answers.opencv.org/question/12597/build-problems-for-opencv-241-with-ubuntu-1204-lts/

  However, one of the answers over there mentioned changing some lines in cap_ffmpeg_impl.hpp file. I tried doing that but either i am not able to do it correctly or something else is going wrong and it is not working. Exact line numbers and exact changes are not mentioned and so I am having difficulty changing things and being sure.

  I am using Fedora 19 (Schrodinger Cat) as the operating system I hope the details of my question are clear and I hope that the community would oblige me with a good response.

  Regards
  Ujjwal

• FFmpeg file not found exception, No such file or directory

  16 avril 2020, par Sagar

  I am getting the No such file or directory exception on video trimming.

  



  video path : /storage/emulated/0/Pictures/Instagram/Fast & Furious 7 - Get Low Extended Version Video.mp4

  



  file name : Fast & Furious 7 - Get Low Extended Version Video.mp4

  



  and ffmpeg searching for only Fast in/storage/emulated/0/Pictures/Instagram/Fast: No such file or directory


  



  I have found the issue, it is causing due to the file name having spaces in between them you can check in the above mentioned path and in exception.

  



  after changing the file name its working but the changing name of every file from the device it's not the right way so how can I solve this exception

  



  FAILED with output : WARNING: linker: /data/user/0/com.example.SeekBarActivity/files/ffmpeg 
has text relocations. This is wasting memory and prevents security hardening.
Please fix. FFmpeg version n2.4.2 Copyright (c) 2000-2014 the FFmpeg developers

built on Oct  7 2014 15:08:46 with gcc 4.8 (GCC)
configuration: --target-os=linux --cross-prefix=/home/sb/Source-Code/ffmpeg-
android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --
cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/sb/Source-
Code/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 
--enable-libass --enable-libfreetype --enable-libfribidi --enable-fontconfig 
--enable-pthreads --disable-debug --disable-ffserver --enable-version3 --
enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --
enable-yasm --disable-doc --disable-shared --enable-static --pkg-
config=/home/sb/Source-Code/ffmpeg-android/ffmpeg-pkg-config --
prefix=/home/sb/Source-Code/ffmpeg-android/build/armeabi-v7a-neon --extra-
cflags='-I/home/sb/Source-Code/ffmpeg-android/toolchain-android/include -
U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-
all -mfpu=neon' --extra-ldflags='-L/home/sb/Source-Code/ffmpeg-
 android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-
 lpng -lexpat -lm' --extra-cxxflags=
  libavutil      54.  7.100 / 54.  7.100
  libavcodec     56.  1.100 / 56.  1.100
  libavformat    56.  4.101 / 56.  4.101
  libavdevice    56.  0.100 / 56.  0.100
  libavfilter     5.  1.100 /  5.  1.100
  libswscale      3.  0.100 /  3.  0.100
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  0.100 / 53.  0.100
  /storage/emulated/0/Pictures/Instagram/Fast: No such file or directory


  


• Audio is not playing properly in ffmpeg player

  10 juillet 2019, par user1241903

  I need to create a player which will decrypt the input on-fly and play the content.
  I have choosen ffmpeg libs (libav*) to create player and to start I have followed this link

  but audio is not playing properly,video is playing fine.
  I am using ubuntu 12.04LTS 64bit OS with the following ffmpeg version,

  admin@vz-X401A1:~$ ffmpeg 
  
  ffmpeg version 2.0 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Sep 11 2013 13:46:26 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
    configuration: --prefix=/home/admin/ffmpeg_build --extra-cflags=-I/home/admin/ffmpeg_build/include --extra-ldflags=-L/home/admin/ffmpeg_build/lib --bindir=/home/admin/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab
  
    libavutil      52. 43.100 / 52. 43.100
  
    libavcodec     55. 31.101 / 55. 31.101
  
    libavformat    55. 16.102 / 55. 16.102
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 84.100 /  3. 84.100
  
    libswscale      2.  5.100 /  2.  5.100
  
    libswresample   0. 17.103 /  0. 17.103
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Hyper fast Audio and Video encoder
  
  usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...
  
  
  
  Use -h to get full help or, even better, run 'man ffmpeg'
  
  admin@vz-X401A1:~$

  and downloaded tutorial07.c from this link

  still, with this also, sound is not playing properly.

  I need help to solve the following issues,

  1. How can I fix this audio issue(I have gone through similar question in StackOverflow and installed old ver. of ffmpeg, but issue still remains).

  2. And also suggest some steps or tutorial, how to implement on-fly decryption process (in C) and integrate this with the player.