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• Using ffmpeg trim filter to trim a video, while preserving it's audio (with filter_complex)

  18 janvier 2021, par IanDess

  I reached a part where i can cut the video with

  



  ffmpeg -i test.mp4 -filter_complex 
'[0:v] trim=start=5:end=10,setpts=PTS-STARTPTS [cut]' -map [cut]  output.mp4


  



  And it successfully trims the video, however it completely removes the audio. I'm trying to chain couple of different filters, so i'd like to keep the similar syntax, just to somehow preserve the audio.

  


• How to integrate shared object file of libx264 while using ffmpeg for android ?

  5 août 2014, par user3665376

  I am working with integrating ffmpeg for android .

  Since I needed H.264 encoding I need to integrate libx264 with ffmpeg . Given below are the steps I followed .

  1) Build the latest libx264 using android compiler tool-chain to obtain libx264.so.142 .

  2) Build ffmpeg v 2.3 referring to this with —enable -libx264 option while configuring ffmpeg . The method explained in the blog included some editing in configure file of ffmpeg to generate shared object files with extension format [lib name].so rather than the generating shared object file with extension format [lib name].so.[version] (Since android build system supports files with extension .so only).

  The building process was successful but since the generated .so files (after building ffmpeg) has dynamic dependency with libx264.so.142,I need to package libx264.so.142 also with the android .apk file . But since the above format (.so.142) is not supported with android apk building system I cannot package it with the .apk .

  So I think the only option I have is to make some changes in configure file of ffmpeg to change the dynamic dependency of libx264.so.142 to libx264.so . Am I right ??

  What changes do I need to make to ffmpeg configure file to achieve this ?

• compiling ffmpeg_g.exe on mingw

  21 janvier 2014, par user3219986

  I have compiled ffmpeg from source using MSYS2 & MinGW. The library files : libavcodec.a, libavdvice.a libavfilter.a libavformat.a libavutila libpostproc.a libswresample.a libswscale.a were created successfully after running make and when it proceeds to build ffmpeg_g.exe I am getting lot of undefined references. Using -d option in make I found out that the command passed for building ffmpeg_g is :

  g++ -Llibavcodec -Llibavdevice -Llibavfilter -Llibavformat -Llibavresample -Llibavutil -Llibpostproc -Llibswscale -Llibswresample -Wl,—nxcompat -Wl,—dynamicbase -Wl,—as-needed -Wl,—warn-common-Wl,-rpathlink=libpostproc:libswresample:libswscale:libavfilter:libavdevice:libavformat:libavcodec:libavutil:libavresample -o ffmpeg_g.exe ffmpeg_opt.o ffmpeg_filter.o ffmpeg.o cmdutils.o -lavdevice -lavfilter -lavformat -lavcodec -lpostproc -lswresample -lswscale -lavutil -lavicap32 -lpsapi -lole32 -lstrmiids -luuid -lws2_32 -lx264 -lvorbisenc -lvorbis -logg -lopenjpeg -lmp3lame -lbluray -L/mingw32/lib -lass -lm -lharfbuzz -lfontconfig -lexpat -lfreetype -lexpat -lenca -lm -lfribidi -lglib-2.0 -lintl -lws2_32 -lole32 -lwinmm -lshlwapi -lintl -lfreetype -lz -lbz2 -lm -lbz2 -lz -lpsapi -ladvapi32 -lshell32

  The output is given below :

  ffmpeg_opt.o : In function

  new_output_stream':
E:\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:1036: undefined reference to

  avcodec_get_context_defaults3'
  E :\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:1089 : undefined reference to

  av_get_exact_bits_per_sample'
ffmpeg_opt.o: In function

  find_codec_or_die' :
  E :\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:514 : undefined reference to

  avcodec_find_encoder_by_name'
ffmpeg_opt.o: In function

  choose_encoder' :
  E :\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:965 : undefined reference to

  avcodec_find_encoder'
ffmpeg_opt.o: In function

  find_codec_or_die' :
  E :\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:518 : undefined reference to

  avcodec_find_encoder'
E:\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:514: undefined reference to

  avcodec_find_decoder_by_name'
  E :\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:518 : undefined reference to

  avcodec_find_decoder'
ffmpeg_opt.o: In function

  add_input_streams' :
  E :\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:596 : undefined reference to

  av_codec_get_lowres'
ffmpeg_opt.o: In function

  choose_decoder' :
  E :\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:546 : undefined reference to

  avcodec_find_decoder'
ffmpeg_opt.o: In function

  add_input_streams' :
  E :\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:546 : undefined reference to

  avcodec_find_decoder'
ffmpeg_opt.o: In function

  open_input_file' :
  E :\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:872 : undefined reference to

  avcodec_get_class'
ffmpeg_opt.o: In function

  add_input_streams' :
  E :\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:631 : undefined reference to

  avcodec_find_decoder'
E:\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:595: undefined reference to

  avcodec_find_decoder'
  ........................ so many undefined references followed by :
  E :\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/libavcodec/mlpdsp.c:64 : undefined reference to

  ff_mlpdsp_init_x86'
libavcodec/libavcodec.a(mpegaudiodsp.o): In function

  ff_mpadsp_init' :
  E :\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/libavcodec/mpegaudiodsp.c:46 : undefined reference to

  ff_mpadsp_init_x86'
libavcodec/libavcodec.a(cavsdsp.o): In function

  ff_cavsdsp_init' :
  E :\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/libavcodec/cavsdsp.c:565 : undefined reference to `ff_cavsdsp_init_x86'
  collect2.exe : error : ld returned 1 exit status

  LD ffmpeg_g.exe
  Reaping losing child 01584DA0 PID 29691080
  Makefile:105 : recipe for target 'ffmpeg_g.exe' failed
  Removing child 01584DA0 PID 29691080 from chain.

  Kindly tell me why the compilation fails.... Thanks in advance