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• Silence (zero out) parts off an audio file

  4 juillet 2016, par Yoni Levy

  I want to silence parts of an audio file (position varies) using some command line tool (ffmpeg, sox, ...) but can’t find out how.

  I found sox ... pad to be the closest to what I want but it’s still not it, I need to override the audio not add to it (pad).

• FFMPEG converted video from .AVI to .MP4 is not working in Chrome but in Firefox and IE

  9 juin 2016, par Tarun P

  I have an window application that converts video from *.wmv video to *.avi video using FFMPEG, but .avi videos are not supported by Html video tag in browser, so I have converted .avi videos to .mp4 using same FFMPEG tool to run it on browser. Now the videos are working fine in Firefox and IE browsers but not working in Chrome.

  If anybody have any suggestion on it, please share.
  Thanks.

• Linking problems using CMake

  5 décembre 2013, par Zoellick

  I'm writing an application containig 2 internal libraries and depends on more 2 external libraries (ffmpeg and opencv). I'm also using CMake to produce UNIX makefiles. And the problem is when i'm trying to build sources, it compiles but don't link with ffmpeg at all and the next output the linker gives :

  ../../Decoder/libDecoder.a(ConverterAVFrameToRGB.cpp.o): In function `FaceVideo::ConverterAVFrameToRGB::to_rgb_conversion(std::vector >&, int, int, int)':
  
  ConverterAVFrameToRGB.cpp:(.text+0x990): undefined reference to `av_frame_free'
  
  ../../Decoder/libDecoder.a(FfmpegDecoder.cpp.o): In function `FaceVideo::FfmpegDecoder::destroy()':
  
  FfmpegDecoder.cpp:(.text+0xa30): undefined reference to `av_frame_free'
  
  ../../Decoder/libDecoder.a(FfmpegDecoder.cpp.o): In function `FaceVideo::FfmpegDecoder::decode_next_chunk(int)':
  
  FfmpegDecoder.cpp:(.text+0xb6b): undefined reference to `av_frame_clone'
  
  FfmpegDecoder.cpp:(.text+0xc13): undefined reference to `av_frame_free'
  
  ../../Decoder/libDecoder.a(FfmpegEncoder.cpp.o): In function `FaceVideo::FfmpegEncoder::destroy()':
  
  FfmpegEncoder.cpp:(.text+0x132): undefined reference to `avcodec_free_frame'
  
  ../../Decoder/libDecoder.a(FfmpegEncoder.cpp.o): In function `FaceVideo::FfmpegEncoder::encode()':
  
  FfmpegEncoder.cpp:(.text+0x4c4): undefined reference to `avcodec_encode_video2'
  
  FfmpegEncoder.cpp:(.text+0x592): undefined reference to `avcodec_encode_video2'
  
  ../../Decoder/libDecoder.a(FrameSaver.cpp.o): In function `FaceVideo::FrameSaver::saver(std::vector >&, int, int, int)':
  
  FrameSaver.cpp:(.text+0x869): undefined reference to `av_frame_free'
  
  collect2: ld returned 1 exit status

  That's excatly what i don't want to see.

  There are three Cmake files : two for internal libraries (use

  add_library(Decoder ${SOURCES_DECODER})
  
               and 
  
  add_library(Detector ${SOURCES_DETECTOR})

  in them) and one for main executable (use

  add_executable(Tool ${SOURCES_TOOL})
  
               and
  
  target_link_libraries (Tool Decoder avutil avcodec swscale avformat Detector ${OpenCV_LIBS})

  in it).

  As far as i understand from CMake manuals and examples, this should make linker link this libraries together, but no effect.

  I've been trying lot of things such as :
  1) Adding link_directories() with path to libraries (/usr/lib/x86_64-linux-gnu/ for me) wherever it's possile, nothing changed.
  2) Linking every library separately, i mean i tried do something like this in my internal libraries CMake files : target_link_libraries (Decoder avutil avcodec swscale avformat). And then link library together into my Tool CMake file : target_link_libraries (Tool Decoder Detector).
  3) Editing output makefiles.
  4) Compiling simple one-file application just to test whether i can do it or not. I can. g++ -lavcodec -o out mysource.cpp works perfectly.
  5) Compling ffmpeg manually and installing it.

  The fact is i realy don't know what should i do. I have no idea. And i would very appreciate your every answer.

  Output when CMAKE_VERBOSE_MAKEFILE is set

   !
  /usr/bin/c++ -march=x86-64 -Wall -fPIC -pthread -std=c++0x -D__STDC_CONSTANT_MACROS -march=x86-64 -fPIC CMakeFiles/FaceDetectorTool.dir/home/anton/Programming/facevideo/branches/Stream_Prototype/src/tools/FaceDetectorTool/facedetector.cpp.o -o FaceDetectorTool -rdynamic ../../Detector/libDetector.a ../../Decoder/libDecoder.a -lavutil -lavcodec -lswscale -lavformat /usr/local/lib/libopencv_videostab.so.2.4.7 /usr/local/lib/libopencv_video.so.2.4.7 /usr/local/lib/libopencv_ts.a /usr/local/lib/libopencv_superres.so.2.4.7 /usr/local/lib/libopencv_stitching.so.2.4.7 /usr/local/lib/libopencv_photo.so.2.4.7 /usr/local/lib/libopencv_ocl.so.2.4.7 /usr/local/lib/libopencv_objdetect.so.2.4.7 /usr/local/lib/libopencv_nonfree.so.2.4.7 /usr/local/lib/libopencv_ml.so.2.4.7 /usr/local/lib/libopencv_legacy.so.2.4.7 /usr/local/lib/libopencv_imgproc.so.2.4.7 /usr/local/lib/libopencv_highgui.so.2.4.7 /usr/local/lib/libopencv_gpu.so.2.4.7 /usr/local/lib/libopencv_flann.so.2.4.7 /usr/local/lib/libopencv_features2d.so.2.4.7 /usr/local/lib/libopencv_core.so.2.4.7 /usr/local/lib/libopencv_contrib.so.2.4.7 /usr/local/lib/libopencv_calib3d.so.2.4.7 -ldl -lm -lpthread -lrt /usr/local/lib/libopencv_nonfree.so.2.4.7 /usr/local/lib/libopencv_ocl.so.2.4.7 /usr/local/lib/libopencv_gpu.so.2.4.7 /usr/local/lib/libopencv_photo.so.2.4.7 /usr/local/lib/libopencv_objdetect.so.2.4.7 /usr/local/lib/libopencv_legacy.so.2.4.7 /usr/local/lib/libopencv_video.so.2.4.7 /usr/local/lib/libopencv_ml.so.2.4.7 /usr/local/lib/libopencv_calib3d.so.2.4.7 /usr/local/lib/libopencv_features2d.so.2.4.7 /usr/local/lib/libopencv_highgui.so.2.4.7 /usr/local/lib/libopencv_imgproc.so.2.4.7 /usr/local/lib/libopencv_flann.so.2.4.7 /usr/local/lib/libopencv_core.so.2.4.7 -Wl,-rpath,/usr/local/lib