![]() Sox WARN sox: `bad.ogg' output clipped 126 samples decrease volume?Īpplying a gain effect can often solve this problem: $ sox bad.wav bad.ogg gain -1 FadeĪnother useful effect is fade. ![]() For instance, sometimes audio that's too loud can cause problems during conversion: $ sox bad.wav bad.ogg It can alter audio prior to sending the data to its final destination. The effects chain is specified at the end of a command. Here's the command to convert an MP3 file to a lossless FLAC file: $ sox countdown.mp3 output.flacĭuration : 00:00:11.18 = 493056 samples.Ĭomment : 'Comment=Processed by SoX' Effects The simplest conversion command involves only an input file and an output file. That means the pipeline is composed this way: input → combine → output → effects Encoding In command syntax, the effects step is, confusingly, written last. There are a few stages in the sox pipeline: The sox command is meant for converting audio files. I can do lots of media in batches overnight instead of wasting valuable production time waiting for an editing application to churn through them on demand. This way, I can control what format I'm using. I generally prefer to do the conversion myself, in advance. Conversion is happening somewhere, whether it's a secret background task or a prompt for you to save a copy. While nearly all editing applications accept compressed audio, none of them actually edit the compressed data. In this example, the audio of a game show countdown has been delivered as an MP3 file. Some of these you might think you already know, but I never trust assumptions when media is brought to me by a client. This output gives you a good idea of what codec the audio file is encoded in, the file length, file size, sample rate, and the number of channels. Sample Encoding: MPEG audio (layer I, II or III) To gather information about an audio file, use the soxi command. Before doing any conversion, however, it's usually a good idea to determine exactly what you're dealing with in the first place. There are use cases in which you don't need to store the converted data, for instance, when you're sending the output directly to your speakers for playback. Whether it stores the rewritten audio data is up to you. SoX provides primarily the sox command, but installation also creates a few useful symlinks: play, rec, and soxi. It doesn't release often, but its codebase tends to be stable, so if you want the latest features (such as Opus support), it's easy and safe to build. You can also install SoX from its home on. On Linux or BSD, you can install the sox command (and some helpful symlinks) from your software repository or ports tree. Free online course: RHEL Technical Overview.
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