Create a delivery copy from your finished production master and follow your podcast host’s accepted format, bitrate and channel requirements. Mediaivo lets you select a format; it has no spoken-word preset, bitrate slider or mono/stereo switch.
What this converter actually exports
- MP3: LAME quality 2, a variable-bitrate setting. The final average bitrate depends on the recording; it is not a selectable fixed 128 kbps export.
- M4A: AAC with a 192 kbps target.
- WAV: 16-bit PCM. This is usually much larger and cannot restore detail missing from an MP3.
- OGG: Vorbis quality 5. Check host support before choosing it.
If your host requires a particular constant bitrate, sample rate, mono mix or loudness target, use an audio editor/exporter that exposes those controls. Changing format in Mediaivo does not normalize loudness, remove room noise or repair clipping.
Estimate the size before you export
For compressed audio, decimal MB ≈ bitrate in kbps × duration in seconds ÷ 8000. A 30-minute episode at 128 kbps is about 28.8 MB; at 192 kbps it is about 43.2 MB, before container overhead. These are planning calculations, not measured Mediaivo MP3 outputs. Variable bitrate and encoder padding change the actual total.
Apple Podcasts’ audio requirements, checked October 10, 2026, distinguishes RSS delivery from subscriber-audio uploads and accepts MP3 or AAC for RSS. Use the requirements for your actual delivery path and host rather than assuming every WAV or OGG is accepted.
Make and check a delivery copy
- Keep the original mix or lossless master. If it is already a delivery MP3, another lossy conversion may make it worse without making it smaller.
- Open Convert Audio and select a supported destination format.
- Download the output. Use Metadata Viewer to check duration, codec, sample rate and channels, then check the actual bytes.
- Listen to a whole sentence, sibilant sounds, quiet room tone, music beds and transitions at unchanged device volume. Check the beginning and end, then use your host’s preview before publication.
The synthetic tone comparison below verifies encoding, duration and size only. It is deliberately not presented as evidence that a podcast voice or music bed sounds good. If the file still exceeds the host limit, shorten unnecessary material in the production editor or use a host-appropriate export setting; repeated conversion is not a reliable size-control method.
Check the actual output
Checked 2026-10-10 with ffmpeg version 7.1.5-0+deb13u1 Copyright (c) 2000-2026 the FFmpeg developers. These are original synthetic files, released under CC0 reuse terms. Executed the repository commandFor and runFfmpeg functions locally. Measurements by FFprobe and filesystem bytes; no production upload, physical device or subjective speech-quality test.
convert audio mp3
Settings: format: mp3
Fixed MP3 quality 2; variable bitrate. Synthetic tone only, not a podcast listening test.
Download input · Download actual output · Exact commands, measurements and SHA-256 hashes
Open convert audio and use the input and settings above.
| Check | Input | Output |
|---|---|---|
| Bytes | 1,152,078 | 53,732 |
| Dimensions / duration | 12 seconds | 12.024 seconds |
| Codecs | pcm_s16le | mp3 |
convert audio m4a
Settings: format: m4a
AAC target 192 kbps. A short mono tone may encode below the target; do not extrapolate its exact size to speech.
Download input · Download actual output · Exact commands, measurements and SHA-256 hashes
Open convert audio and use the input and settings above.
| Check | Input | Output |
|---|---|---|
| Bytes | 1,152,078 | 230,159 |
| Dimensions / duration | 12 seconds | 12 seconds |
| Codecs | pcm_s16le | aac |
This check establishes the recorded behavior for these inputs. It does not prove acceptable quality for faces, text, speech, music, every codec or a particular phone. Compare your own result before sharing.