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  • How to detect audio sampling rate with avprobe / ffprobe ?

    23 novembre 2022, par Devy

    I am using libav 9.6, installed via Homebrew.

    



    $ avprobe -version
avprobe version 9.6, Copyright (c) 2007-2013 the Libav developers
  built on Jun  8 2013 02:44:19 with Apple LLVM version 4.2 (clang-425.0.24) (based on LLVM 3.2svn)
avprobe 9.6
libavutil     52.  3. 0 / 52.  3. 0
libavcodec    54. 35. 0 / 54. 35. 0
libavformat   54. 20. 3 / 54. 20. 3
libavdevice   53.  2. 0 / 53.  2. 0
libavfilter    3.  3. 0 /  3.  3. 0
libavresample  1.  0. 1 /  1.  0. 1
libswscale     2.  1. 1 /  2.  1. 1


    



    Even though the sampling rate is displayed in the stdout in the command line output, the -show_format option doesn't surface the sampling rate information for the audio file at all.

    



    Here is the BASH terminal output :

    



    $ avprobe  -v verbose -show_format -of json  sample.gsm
avprobe version 9.6, Copyright (c) 2007-2013 the Libav developers
  built on Jun  8 2013 02:44:19 with Apple LLVM version 4.2 (clang-425.0.24)
(based on LLVM 3.2svn)
  configuration: --prefix=/usr/local/Cellar/libav/9.6 --enable-shared
--enable-pthreads --enable-gpl --enable-version3 --enable-nonfree
--enable-hardcoded-tables --enable-avresample --enable-vda --enable-gnutls
--enable-runtime-cpudetect --disable-indev=jack --cc=cc --host-cflags=
--host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame
--enable-libxvid --enable-avplay
  libavutil     52.  3. 0 / 52.  3. 0
  libavcodec    54. 35. 0 / 54. 35. 0
  libavformat   54. 20. 3 / 54. 20. 3
  libavdevice   53.  2. 0 / 53.  2. 0
  libavfilter    3.  3. 0 /  3.  3. 0
  libavresample  1.  0. 1 /  1.  0. 1
  libswscale     2.  1. 1 /  2.  1. 1
[gsm @ 0x7f8012806600] Estimating duration from bitrate, this may be inaccurate
Input #0, gsm, from 'sample.gsm':
  Duration: 00:03:52.32, start: 0.000000, bitrate: 13 kb/s
    Stream #0.0: Audio: gsm, 8000 Hz, mono, s16, 13 kb/s
{  "format" : {
    "filename" : "sample.gsm",
    "nb_streams" : 1,
    "format_name" : "gsm",
    "format_long_name" : "raw GSM",
    "start_time" : "0.000000",
    "duration" : "232.320000",
    "size" : "383328.000000",
    "bit_rate" : "13200.000000"
  }}


    



    And the python code example :

    



    >>> filename = 'sample.gsm'
>>> result = subprocess.check_output(['avprobe', '-show_format', '-of',
'json', filename])
avprobe version 9.6, Copyright (c) 2007-2013 the Libav developers
  built on Jun  8 2013 02:44:19 with Apple LLVM version 4.2
(clang-425.0.24) (based on LLVM 3.2svn)
[gsm @ 0x7fe0b1806600] Estimating duration from bitrate, this may be
inaccurate
Input #0, gsm, from 'sample.gsm':
  Duration: 00:03:52.32, start: 0.000000, bitrate: 13 kb/s
    Stream #0.0: Audio: gsm, 8000 Hz, mono, s16, 13 kb/s
>>> print result
{  "format" : {
    "filename" : "sample.gsm",
    "nb_streams" : 1,
    "format_name" : "gsm",
    "format_long_name" : "raw GSM",
    "start_time" : "0.000000",
    "duration" : "232.320000",
    "size" : "383328.000000",
    "bit_rate" : "13200.000000"
}}


    



    So I am aware that sampling rate could be a stream specific display to be shown in -show_format option results. But there isn't any other options to detect the sampling rate on a specific audio stream even though it's possible to set it with -ar when re-encoding it.

    



    I filed a ticket to libav but I am just curious if there is any other way to extract sampling rate from libav probing utils. I appreciate the answer beforehand.

    



    PS : it would be the same question for the upstream project of ffmpeg (ffprobe) in this case.

    


  • How to detect audio sampling rate with avprobe / ffprobe ?

    8 août 2013, par Devy

    I am using libav 9.6, installed via Homebrew.

    $ avprobe -version
    
avprobe version 9.6, Copyright (c) 2007-2013 the Libav developers
    
  built on Jun  8 2013 02:44:19 with Apple LLVM version 4.2 (clang-425.0.24) (based on LLVM 3.2svn)
    
avprobe 9.6
    
libavutil     52.  3. 0 / 52.  3. 0
    
libavcodec    54. 35. 0 / 54. 35. 0
    
libavformat   54. 20. 3 / 54. 20. 3
    
libavdevice   53.  2. 0 / 53.  2. 0
    
libavfilter    3.  3. 0 /  3.  3. 0
    
libavresample  1.  0. 1 /  1.  0. 1
    
libswscale     2.  1. 1 /  2.  1. 1

    Even though the sampling rate is displayed in the stdout in the command line output, the -show_format option doesn't surface the sampling rate information for the audio file at all.

    Here is the BASH terminal output :

    $ avprobe  -v verbose -show_format -of json  sample.gsm
    
avprobe version 9.6, Copyright (c) 2007-2013 the Libav developers
    
  built on Jun  8 2013 02:44:19 with Apple LLVM version 4.2 (clang-425.0.24)
    
(based on LLVM 3.2svn)
    
  configuration: --prefix=/usr/local/Cellar/libav/9.6 --enable-shared
    
--enable-pthreads --enable-gpl --enable-version3 --enable-nonfree
    
--enable-hardcoded-tables --enable-avresample --enable-vda --enable-gnutls
    
--enable-runtime-cpudetect --disable-indev=jack --cc=cc --host-cflags=
    
--host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame
    
--enable-libxvid --enable-avplay
    
  libavutil     52.  3. 0 / 52.  3. 0
    
  libavcodec    54. 35. 0 / 54. 35. 0
    
  libavformat   54. 20. 3 / 54. 20. 3
    
  libavdevice   53.  2. 0 / 53.  2. 0
    
  libavfilter    3.  3. 0 /  3.  3. 0
    
  libavresample  1.  0. 1 /  1.  0. 1
    
  libswscale     2.  1. 1 /  2.  1. 1
    
[gsm @ 0x7f8012806600] Estimating duration from bitrate, this may be inaccurate
    
Input #0, gsm, from 'sample.gsm':
    
  Duration: 00:03:52.32, start: 0.000000, bitrate: 13 kb/s
    
    Stream #0.0: Audio: gsm, 8000 Hz, mono, s16, 13 kb/s
    
{  "format" : {
    
    "filename" : "sample.gsm",
    
    "nb_streams" : 1,
    
    "format_name" : "gsm",
    
    "format_long_name" : "raw GSM",
    
    "start_time" : "0.000000",
    
    "duration" : "232.320000",
    
    "size" : "383328.000000",
    
    "bit_rate" : "13200.000000"
    
  }}

    And the python code example :

    >>> filename = 'sample.gsm'
    
>>> result = subprocess.check_output(['avprobe', '-show_format', '-of',
    
'json', filename])
    
avprobe version 9.6, Copyright (c) 2007-2013 the Libav developers
    
  built on Jun  8 2013 02:44:19 with Apple LLVM version 4.2
    
(clang-425.0.24) (based on LLVM 3.2svn)
    
[gsm @ 0x7fe0b1806600] Estimating duration from bitrate, this may be
    
inaccurate
    
Input #0, gsm, from 'sample.gsm':
    
  Duration: 00:03:52.32, start: 0.000000, bitrate: 13 kb/s
    
    Stream #0.0: Audio: gsm, 8000 Hz, mono, s16, 13 kb/s
    
>>> print result
    
{  "format" : {
    
    "filename" : "sample.gsm",
    
    "nb_streams" : 1,
    
    "format_name" : "gsm",
    
    "format_long_name" : "raw GSM",
    
    "start_time" : "0.000000",
    
    "duration" : "232.320000",
    
    "size" : "383328.000000",
    
    "bit_rate" : "13200.000000"
    
}}

    So I am aware that sampling rate could be a stream specific display to be shown in -show_format option results. But there isn't any other options to detect the sampling rate on a specific audio stream even though it's possible to set it with -ar when re-encoding it.

    I filed a ticket to libav but I am just curious if there is any other way to extract sampling rate from libav probing utils. I appreciate the answer beforehand.

    PS : it would be the same question for the upstream project of ffmpeg (ffprobe) in this case.

  • ffmpeg : alpha merge add audio [closed]

    21 juin 2022, par Alex

    I am alpha merging two videos for iOS/Apple devices (mov), the color.mp4 has audio, while alpha.mp4 has not. The end result has no audio ouput. What is the proper flag to grab audio from color.mp4 onto the output ?

    


     ffmpeg -y -i color.mp4 -i alpha.mp4 -f lavfi -i color=c=black:s=320x568 -filter_complex "[1:v]scale=320:568,setsar=1:1,split[vs][alpha];[0:v][vs]alphamerge[vt];[2:v][vt]overlay=shortest=1[rgb];[rgb][alpha]alphamerge" -shortest -c:v hevc_videotoolbox -allow_sw 1 -alpha_quality 0.75 -vtag hvc1 -pix_fmt yuva420p -an output.mov


    


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