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- .. _doc_importing_audio_samples:
- Importing audio samples
- =======================
- Why importing?
- --------------
- Raw audio data in general is large and undesired. Godot provides two main
- options to import your audio data: WAV and OGG Vorbis.
- Each has different advantages.
- * Wav files use raw data or light compression, require small amount of CPU to play back (hundreds of simultaneous voices in this format are fine), but take up significant space.
- * Ogg Vorbis files use a stronger compression that results in much smaller file size, but uses significantly more processor to play back.
- .. image:: img/audio_stream_import.png
- Here is a comparative chart.
- +-------------------------------+---------------------+
- | Format | 1 Second of Audio |
- +===============================+=====================+
- | WAV 24 bits, 96 kHz, Stereo | 576kb |
- +-------------------------------+---------------------+
- | WAV 16 bits, 44 kHz, Mono | 88kb |
- +-------------------------------+---------------------+
- | WAV 16 bits, IMA-ADPCM, Mono | 22kb |
- +-------------------------------+---------------------+
- | OGG 128kbps, Stereo | 16kb |
- +-------------------------------+---------------------+
- | OGG Vorbis 96kbps, Stereo | 12kb |
- +-------------------------------+---------------------+
- In general, what is recommended, is to use WAV for most sound effects, especially those that are short and repetitive, and OGG for music, voice and long sound effects.
- Best Practices
- --------------
- Godot 3+ has an amazing bus system with built in effects. This saves
- SFX artists the need to add reverb to the sound effects, reducing their
- size greatly and ensuring correct trimming. Say no to SFX with baked
- reverb!
- .. image:: img/reverb.png
- As you can see above, sound effects become huge with reverb added.
- Trimming
- ~~~~~~~~
- One issue that happens often is that the waveform are exported with long
- silences at the beginning and at the end. These are inserted by
- DAWs when saving to a waveform, increase their size unnecessarily and
- add latency to the moment they are played back.
- Importing as WAV with the Trimming option enabled solves
- this.
- Looping
- ~~~~~~~
- Godot supports looping in the samples (Tools such as Sound Forge or
- Audition can add loop points to wav files). This is useful for sound
- effects such as engines, machine guns, etc. Ping-pong looping is also
- supported.
- As an alternative, the import screen has a "loop" option that enables
- looping for the entire sample when importing.
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