MP4 to WAV for Podcasts

Podcasters hit this specific conversion because phone video is where the MP4 came from — a remote guest, a field recording, a clip — and the video stream is nearly the entire file, so extracting the audio collapses a 500 MB video into a few MB. For a show you need WAV, so the MP4-to-WAV step is part of the edit, not an afterthought.

Edit in WAV, publish in something lossy. Keeping the working file lossless means your cuts, levelling, noise reduction, and EQ all happen on raw samples — and only the final episode export is lossy, applied once to the finished mix.

Podcast bitrates are lower than most people assume, deliberately. 128 kbps stereo is the widely used standard, and 64–96 kbps mono is entirely respectable for pure speech — it roughly halves the download for every listener, which adds up across a back catalogue and matters to anyone on limited mobile data. Reserve 192 kbps and above for shows where music genuinely carries the experience.

Mono is the decision most worth revisiting. If your episode is voices with no meaningful stereo image — which describes most interview and solo shows — mono at 96 kbps is perceptually equivalent to stereo at 192 and half the size. Publishing stereo by default is a habit, not a requirement. And archive the lossless edit: social clips, best-of segments, and fixes should always be cut from that, never from the published file.

MP4 costs you around 60 MB for every minute; WAV asks for about 10. Over a long recording that gap is the whole reason to convert. What MP4 threw away is unrecoverable. WAV preserves what's left perfectly, which is the most any format can do for it.

MP4 is the format of phone video. It plays where it was made, but the video stream is nearly the entire file, so extracting the audio collapses a 500 MB video into a few MB. WAV is the destination when you need uncompressed, edit-ready audio that every DAW and editor accepts. Storage-wise you're looking at about 6× less: 60 MB per minute becomes roughly 10. One honest note on this exact pair: MP4 is already lossy, so moving to WAV cannot restore detail the MP4 encoder discarded — it hands you an uncompressed container, not better audio, and the value is a loss-free chain from here on.