2023-01-12 20:49:14 +01:00
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2022-03-18 17:46:08 +01:00
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Importing audio samples
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=======================
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Supported files
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---------------
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Godot provides three options to import your audio data: WAV, Ogg Vorbis
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and MP3.
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Each has different advantages.
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* WAV files use raw data or light compression (IMA-ADPCM). They are lightweight
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on the CPU to play back (hundreds of simultaneous voices in this format are
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fine). The downside is that they take up a lot of disk space.
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* Ogg Vorbis files use a stronger compression that results in much
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smaller file size, but require significantly more processing power to
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play back.
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* MP3 files use better compression than WAV with IMA-ADPCM, but worse than
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Ogg Vorbis. This means that a MP3 file with roughly equal quality to
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Ogg Vorbis will be significantly larger. On the bright side, MP3 requires
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less CPU usage to play back compared to Ogg Vorbis. This makes MP3 useful
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for mobile and HTML5 projects where CPU resources are limited, especially
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when playing multiple compressed sounds at the same time (such as long
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ambient sounds).
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Here is a comparative chart.
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+-----------------------------+-------------------+
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| Format | 1 second of audio |
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+=============================+===================+
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| WAV 24-bit, 96 kHz, stereo | 576 KB |
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+-----------------------------+-------------------+
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| WAV 16-bit, 44 kHz, mono | 88 KB |
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+-----------------------------+-------------------+
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| WAV 16-bit, IMA-ADPCM, mono | 22 KB |
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+-----------------------------+-------------------+
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| MP3 192 Kb/s, stereo | 24 KB |
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+-----------------------------+-------------------+
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| Ogg Vorbis 128 Kb/s, stereo | 16 KB |
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+-----------------------------+-------------------+
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| Ogg Vorbis 96 Kb/s, stereo | 12 KB |
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+-----------------------------+-------------------+
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Consider using WAV for short and repetitive sound effects, and Ogg Vorbis
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for music, speech, and long sound effects.
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Best practices
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--------------
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2023-01-12 20:47:54 +01:00
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Godot has an `extensive bus system ( doc_audio_buses )` with built-in effects.
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2022-03-18 17:46:08 +01:00
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This saves SFX artists the need to add reverb to the sound effects,
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reducing their size greatly and ensuring correct trimming. Say no to SFX
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with baked reverb!
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2023-01-12 20:16:00 +01:00
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2022-03-18 17:46:08 +01:00
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As you can see above, sound effects become huge with reverb added.
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Trimming
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~~~~~~~~
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One issue that happens often is that the waveform is exported with long
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silences at the beginning and at the end. These are inserted by
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DAWs when saving to a waveform, increase their size unnecessarily and
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add latency to the moment they are played back.
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Importing as WAV with the **Trimming** option enabled solves
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this.
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Looping
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~~~~~~~
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Godot supports looping in the samples (tools such as Sound Forge or
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Audition can add loop points to WAV files). This is useful for sound
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effects, such as engines, machine guns etc. Ping-pong looping is also
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supported.
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As an alternative, the Import dock has a **Loop** option that enables
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looping for the entire sample when importing.
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