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• Generate AcoustID/Chromaprint acoustic fingerprint in iOS

  28 March 2023, by ttarik

  Chromaprint is an open-source software library for calculating an AcoustID audio fingerprint of an audio file.

  



  I'm trying to generate this audio fingerprint from a local file on iOS.

  



  The library can be built on Windows, Linux and OS X, where it creates a dynamic library as well as a standalone program (fpcalc) that accepts an audio file, decodes the audio and passes it to the chromaprint library to calculate the fingerprint. It doesn't really work on iOS for the following reasons:

  



  

  1. The standalone fpcalc program can't be run on iOS because you can't run an executable from an app

  


  2. The source code to the fpcalc program uses chromaprint and ffmpeg. From what I've read, ffmpeg is difficult to compile on iOS. The chromaprint docs state that the Accelerate framework can be used in OS X/iOS, but there is no example code to do this and I have no idea where to start.

  


  



  I've been having a bit of trouble actually building the library for iOS (CMake hates me), but I feel like the above problems are more relevant because even with the library compiled, it wouldn't just work out of the box.

  



  I'm trying to avoid this being a "write my code for me" question, but I am very much stuck on essentially every aspect of generating a chromaprint fingerprint for iOS.

  



  My goal, I think, is to recreate the functionality of the fpcalc program on iOS - to decode an audio file (stored on the device, of any audio type) and pass it to the chromaprint library to generate the fingerprint.

  



  I found this question about acoustic fingerprinting on iOS but it wasn't relevant to chromaprint/AcoustID and the answers were less than helpful. Echoprint Codegen is interesting, but I need a chromaprint fingerprint.

  


• Which FFMPEG Arguments to Copy .m4a Audio File in Flutter?

  25 July 2021, by Meggy

  I've got my own fork of GSPrakashNaidu' Flutter Audio_Trimmer plugin which I'd like to use to edit an M4a audio file.

  


  https://github.com/meghead/audio_trimmer

  


  The plugin passes the following command to Flutter's FFMPEG plugin;

  


  "-y -i \"$path\" -vn -ss $start -to $end -ar 16k -ac -c:a aac -b:a 96k -acodec copy $outPath"; 


  


  Which can be seen here in the Android Studio console;

  


  Running FFmpeg with arguments: [-y, -i, /storage/emulated/0/Android/data/myfiles/files/flutter_audio_recorder_1627212132002.m4a.temp, -vn, -ss, 5.0, -to, 10.5, -ar, 44k, -ac, 2, -b:a, 96k, -acodec, copy, /data/user/0/myfiles/cache/output.m4a].


  


  But here's the error which gets thrown;

  


  Guessed Channel Layout for Input Stream #0.0 : mono
I/mobile-ffmpeg(21007): Input #0, wav, from '/storage/emulated/0/Android/data/myfiles/files/flutter_audio_recorder_1627212265033.m4a':
I/mobile-ffmpeg(21007):   Duration: 
I/mobile-ffmpeg(21007): 00:00:01.91
I/mobile-ffmpeg(21007): , bitrate: 
I/mobile-ffmpeg(21007): 705 kb/s
I/mobile-ffmpeg(21007): 
I/mobile-ffmpeg(21007):     Stream #0:0
I/mobile-ffmpeg(21007): : Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, mono, s16, 705 kb/s
I/mobile-ffmpeg(21007): 
E/mobile-ffmpeg(21007): [ipod @ 0x7277f388c0] Could not find tag for codec pcm_s16le in stream #0, codec not currently supported in container
E/mobile-ffmpeg(21007): Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
I/mobile-ffmpeg(21007): Stream mapping:
I/mobile-ffmpeg(21007):   Stream #0:0 -> #0:0
I/mobile-ffmpeg(21007):  (copy)
I/mobile-ffmpeg(21007): 
E/mobile-ffmpeg(21007): 
I/mobile-ffmpeg(21007): Conversion failed!
D/flutter-ffmpeg(21007): FFmpeg exited with rc: 1 


  


  What argument can I use to output .m4a?

  


• Which FFMPEG Arguments to Pass for .m4a Audio File in Flutter?

  25 July 2021, by Meggy

  I've got my own fork of GSPrakashNaidu' Flutter Audio_Trimmer plugin which I'd like to use to edit an M4a audio file.

  


  https://github.com/meghead/audio_trimmer

  


  The plugin passes the following command to Flutter's FFMPEG plugin;

  


  "-y -i \"$path\" -vn -ss $start -to $end -ar 16k -ac -c:a aac -b:a 96k -acodec copy $outPath"; 


  


  Which can be seen here in the Android Studio console;

  


  Running FFmpeg with arguments: [-y, -i, /storage/emulated/0/Android/data/myfiles/files/flutter_audio_recorder_1627212132002.m4a.temp, -vn, -ss, 5.0, -to, 10.5, -ar, 44k, -ac, 2, -b:a, 96k, -acodec, copy, /data/user/0/myfiles/cache/output.m4a].


  


  But here's the error which gets thrown;

  


  Guessed Channel Layout for Input Stream #0.0 : mono
I/mobile-ffmpeg(21007): Input #0, wav, from '/storage/emulated/0/Android/data/myfiles/files/flutter_audio_recorder_1627212265033.m4a':
I/mobile-ffmpeg(21007):   Duration: 
I/mobile-ffmpeg(21007): 00:00:01.91
I/mobile-ffmpeg(21007): , bitrate: 
I/mobile-ffmpeg(21007): 705 kb/s
I/mobile-ffmpeg(21007): 
I/mobile-ffmpeg(21007):     Stream #0:0
I/mobile-ffmpeg(21007): : Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, mono, s16, 705 kb/s
I/mobile-ffmpeg(21007): 
E/mobile-ffmpeg(21007): [ipod @ 0x7277f388c0] Could not find tag for codec pcm_s16le in stream #0, codec not currently supported in container
E/mobile-ffmpeg(21007): Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
I/mobile-ffmpeg(21007): Stream mapping:
I/mobile-ffmpeg(21007):   Stream #0:0 -> #0:0
I/mobile-ffmpeg(21007):  (copy)
I/mobile-ffmpeg(21007): 
E/mobile-ffmpeg(21007): 
I/mobile-ffmpeg(21007): Conversion failed!
D/flutter-ffmpeg(21007): FFmpeg exited with rc: 1 


  


  What argument can I use to output .m4a?