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• FFMpeg Concatenation Filters : Stream specifier ':0' in filtergraph matches no streams

  7 février 2017, par Anthony Eden

  I am developing an application that relies heavily on FFMpeg to perform various transformations on audio files. I am currently testing my FFMpeg configuration on the command line.

  I am trying to concatenate multiple audio files which are in different formats (Primarily MP3, MP2 & WAV). I have been using the official TRAC documentation (https://trac.ffmpeg.org/wiki/How%20to%20concatenate%20(join%2C%20merge)%20media%20files#differentcodec) to help me with this and have created the following command :

  ffmpeg -i OHIn.wav -i OHOut.wav -filter_complex '[0:0] [1:0] concat=n=2:a=1 [a]' -map '[a]' output.wav

  However, when I run this on Mac OS X using version 2.0.1 of FFMpeg, I get the following error message :

  Stream specifier ':0' in filtergraph description [0:0] [1:0] concat=n=2:a=1 [a] matches no streams.

  Here is my full output from the terminal :

  ~/ffmpeg -i OHIn.wav -i OHOut.wav -filter_complex '[0:0] [1:0] concat=n=2:a=1 [a]' -map '[a]' output.wav
  
  
  
  ffmpeg version 2.0.1 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Aug 15 2013 10:56:46 with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
  
    configuration: --prefix=/Volumes/Ramdisk/sw --enable-gpl --enable-pthreads --enable-version3 --enable-libspeex --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-avfilter --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters --enable-libgsm --arch=x86_64 --enable-runtime-cpudetect
  
    libavutil      52. 38.100 / 52. 38.100
  
    libavcodec     55. 18.102 / 55. 18.102
  
    libavformat    55. 12.100 / 55. 12.100
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 79.101 /  3. 79.101
  
    libswscale      2.  3.100 /  2.  3.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Guessed Channel Layout for  Input Stream #0.0 : stereo
  
  Input #0, wav, from 'OHIn.wav':
  
    Duration: 00:00:06.71, bitrate: 1411 kb/s
  
      Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
  
  Guessed Channel Layout for  Input Stream #1.0 : stereo
  
  Input #1, wav, from 'OHOut.wav':
  
    Duration: 00:00:07.19, bitrate: 1411 kb/s
  
      Stream #1:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
  
  Stream specifier ':0' in filtergraph description [0:0] [1:0] concat=n=2:a=1 [a] matches no streams.

  I do not understand why this does not work. FFMpeg shows that the streams 0:0 and 1:0 exist in the source files. The only other similar problems online have surrounded the use of the single quote in Windows, however testing of this confirm it does not apply to my Mac command line.

  Any help would be much appreciated.

• Adding a custom filter to FFmpeg

  16 juillet 2024, par Abhimanyu

  I am looking to configure and compile FFmpeg with custom filter.
custom filters are available on this git repository which is compiled with older ffmpeg version
https://github.com/numberwolf/FFmpeg-PlusPlus

  


  I am following the steps mentioned on the ffmpeg official website
https://github.com/FFmpeg/FFmpeg/blob/master/doc/writing_filters.txt

  


  I am getting warning plusglshader filter is unknown and same for all other filters

  


  Here are my steps :

  


  First, create your filter source files in the libavfilter directory :

  


  `libavfilter/vf_plusglshader.c
libavfilter/vf_pipglshader.c
libavfilter/vf_lutglshader.c
libavfilter/vf_fadeglshader.c`


  


  Update the FFmpeg build system by adding your new filter files to libavfilter/Makefile :

  


  I am getting following below steps

  


  First, create your filter source files in the libavfilter directory :

  


  `libavfilter/vf_plusglshader.c
libavfilter/vf_pipglshader.c
libavfilter/vf_lutglshader.c
libavfilter/vf_fadeglshader.c`


  


  Update the FFmpeg build system by adding your new filter files to libavfilter/Makefile :

  


  `OBJS-$(CONFIG_PLUSGLSHADER_FILTER)    += vf_plusglshader.o
OBJS-$(CONFIG_PIPGLSHADER_FILTER)     += vf_pipglshader.o
OBJS-$(CONFIG_LUTGLSHADER_FILTER)     += vf_lutglshader.o
OBJS-$(CONFIG_FADEGLSHADER_FILTER)    += vf_fadeglshader.o`


  


  In libavfilter/allfilters.c, add your filter declarations :

  


  `extern const AVFilter ff_vf_plusglshader;
extern const AVFilter ff_vf_pipglshader;
extern const AVFilter ff_vf_lutglshader;
extern const AVFilter ff_vf_fadeglshader;`


  


  In libavfilter/filter_list.c (not allfilters.c), add your filters to the filter_list array :

  


  `static const AVFilter * const filter_list[] = {
    // ... existing filters ...
    &ff_vf_plusglshader,
    &ff_vf_pipglshader,
    &ff_vf_lutglshader,
    &ff_vf_fadeglshader,
    NULL
};`


  


  In libavfilter/allfilters.c, add your filter declarations :

  


  `extern const AVFilter ff_vf_plusglshader;
extern const AVFilter ff_vf_pipglshader;
extern const AVFilter ff_vf_lutglshader;
extern const AVFilter ff_vf_fadeglshader;`


  


  In libavfilter/filter_list.c (not allfilters.c), add your filters to the filter_list array :

  


  `static const AVFilter * const filter_list[] = {
    // ... existing filters ...
    &ff_vf_plusglshader,
    &ff_vf_pipglshader,
    &ff_vf_lutglshader,
    &ff_vf_fadeglshader,
    NULL
};`


  


  `

  


• FFMpeg Concatenation Filters : Stream specifier ':0' in filtergraph matches no streams

  8 décembre 2018, par Anthony Eden

  I am developing an application that relies heavily on FFMpeg to perform various transformations on audio files. I am currently testing my FFMpeg configuration on the command line.

  I am trying to concatenate multiple audio files which are in different formats (Primarily MP3, MP2 & WAV). I have been using the official TRAC documentation (https://trac.ffmpeg.org/wiki/How%20to%20concatenate%20(join%2C%20merge)%20media%20files#differentcodec) to help me with this and have created the following command :

  ffmpeg -i OHIn.wav -i OHOut.wav -filter_complex '[0:0] [1:0] concat=n=2:a=1 [a]' -map '[a]' output.wav

  However, when I run this on Mac OS X using version 2.0.1 of FFMpeg, I get the following error message :

  Stream specifier ':0' in filtergraph description [0:0] [1:0] concat=n=2:a=1 [a] matches no streams.

  Here is my full output from the terminal :

  ~/ffmpeg -i OHIn.wav -i OHOut.wav -filter_complex '[0:0] [1:0] concat=n=2:a=1 [a]' -map '[a]' output.wav
  
  
  
  ffmpeg version 2.0.1 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Aug 15 2013 10:56:46 with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
  
    configuration: --prefix=/Volumes/Ramdisk/sw --enable-gpl --enable-pthreads --enable-version3 --enable-libspeex --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-avfilter --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters --enable-libgsm --arch=x86_64 --enable-runtime-cpudetect
  
    libavutil      52. 38.100 / 52. 38.100
  
    libavcodec     55. 18.102 / 55. 18.102
  
    libavformat    55. 12.100 / 55. 12.100
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 79.101 /  3. 79.101
  
    libswscale      2.  3.100 /  2.  3.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Guessed Channel Layout for  Input Stream #0.0 : stereo
  
  Input #0, wav, from 'OHIn.wav':
  
    Duration: 00:00:06.71, bitrate: 1411 kb/s
  
      Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
  
  Guessed Channel Layout for  Input Stream #1.0 : stereo
  
  Input #1, wav, from 'OHOut.wav':
  
    Duration: 00:00:07.19, bitrate: 1411 kb/s
  
      Stream #1:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
  
  Stream specifier ':0' in filtergraph description [0:0] [1:0] concat=n=2:a=1 [a] matches no streams.

  I do not understand why this does not work. FFMpeg shows that the streams 0:0 and 1:0 exist in the source files. The only other similar problems online have surrounded the use of the single quote in Windows, however testing of this confirm it does not apply to my Mac command line.

  Any help would be much appreciated.