MP4 to OGG 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 OGG, so the MP4-to-OGG step is part of the edit, not an afterthought.

OGG is what you publish — Apple Podcasts, Spotify, and every RSS-based host expect it. The order matters more than the format: record and edit on a lossless file, and encode the OGG once, from the finished episode. Converting early means every later edit sits on top of lossy audio and your export adds another generation on top of that.

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.

A minute of MP4 is about 60 MB; the same minute as OGG is roughly 1.2. Across an album or a long recording that difference decides whether it fits on a phone. Re-encoding lossy to lossy compounds artifacts. Convert once, at a high bitrate, and keep the result rather than round-tripping again.

Where does a MP4 file even come from? Usually phone video, recorded webinars and lectures, downloaded clips, and screen captures. The catch is that the video stream is nearly the entire file, so extracting the audio collapses a 500 MB video into a few MB. OGG is the destination because it plays essentially everywhere — game assets and every ordinary phone, browser, and player. The size drop is the point — around 50× less data, which is what turns an unsendable file into an attachment. Both MP4 and OGG are lossy, so this pair stacks a second encode — at a generous bitrate it stays inaudible, but if a lossless original of the MP4 exists, encode the OGG from that instead.