Choosing an audio format is a trade-off between quality, file size, compatibility and future editing.
| Format |
Compression |
Typical use |
Main advantage |
| WAV |
usually uncompressed |
editing, interchange |
simple, high-quality working file |
| FLAC |
lossless |
archive, music library |
smaller without signal loss |
| MP3 |
lossy |
sharing, podcasts |
excellent compatibility |
| AAC/M4A |
lossy |
mobile, multimedia |
efficient modern distribution |
| OGG/Vorbis |
lossy |
Web/open ecosystems |
open format |
| Opus |
lossy |
speech, streaming |
very efficient at moderate bitrates |
WAV for working files
WAV is a common choice during editing because PCM audio avoids repeated lossy encoding. The trade-off is file size.
FLAC for lossless storage
FLAC compresses without losing the decoded signal. It is a strong choice for archives and libraries when space matters.
Converting MP3 to FLAC does not restore information already removed by MP3 encoding.
MP3 for broad compatibility
MP3 remains practical when a file must play almost everywhere. Quality depends heavily on the chosen bitrate and source complexity.
AAC, M4A, OGG and Opus
M4A is a container commonly used with AAC. OGG is often associated with Vorbis. Opus is a modern codec that performs particularly well for speech and streaming.
Bethemesh currently writes Opus with FFmpeg’s native CELT-only encoder, without libopus SILK speech mode. Compare your own low-bitrate speech results rather than assuming the usual performance of the complete Opus codec.
When a platform specifies technical requirements, check both the extension and the codec.
A healthy conversion strategy
Keep the original. Perform trimming, normalization, channel or sample-rate changes first, then encode the final distribution copy.
Use the audio converter for format conversion and read Audio compression: bitrate, format and quality before choosing aggressive compression settings.
For repeated processing, build the sequence as a Workspace audio pipeline.