问题
I have been searching for the C# library or code sample which could help me to do the conversion of m4a audio file to flac, but more importantly with sample rate (of 16000), mono channel and bit resolution of either 16 or 24.
Right now, I have found library solutions like NAudio, MediaToolKit and SOXSharp. But I cannot get enough information how to use them accordingly.
I needed those converted audio files for Google Cloud speech to text API inputs.
I have found this great website where I can convert files manually and they are working great with API.
Is there any C# library which can help to convert .M4A audio file to .FLAC?
回答1:
I was able to solve this issue with library FFMpeg.Net and FFMpeg.
Install on windows guide here.
and then in code
var inputFile = new MediaFile (@"C:\file.m4a");
var outputFile = new MediaFile (@"C:\file.flac");
var ffmpeg = new Engine("C:\\ffmpeg\\ffmpeg.exe");
await ffmpeg.ConvertAsync(inputFile, outputFile);
Beware there might be file write permission denied error when writing to c:// and windows environment variable.
来源：https://stackoverflow.com/questions/56573987/m4a-audio-file-convert-to-flac-c-sharp