MOV to M4A for Music Production

Keep M4A out of the session itself. Lossy files inside a project mean the DAW decodes on import and re-encodes on export, and any processing you apply — EQ, compression, limiting — amplifies the codec's artifacts rather than hiding them. M4A is a delivery format: reference mixes, client sends, demos on a phone.

One trap catches people out: lossy encoding can push peaks slightly above the source, so a mix sitting exactly at 0 dBFS can clip once it becomes a M4A. Leave about -1 dBTP of headroom on the bounce you encode from — standard practice for masters, and it applies to reference files too.

Never send a lossy file to a distributor or streaming platform. They transcode whatever you upload into their own formats, so handing them an already-compressed file stacks a second lossy generation onto what your listeners actually hear. Deliver lossless; convert to lossy for humans.

MOV costs you around 60 MB for every minute; M4A asks for about 1.2. Over a long recording that gap is the whole reason to convert. Two lossy formats in a row means two rounds of the encoder guessing what you won't miss. At a high bitrate the second guess is harmless; at a low one it compounds.

MOV is the format of iPhone videos. It plays where it was made, but MOV is Apple's QuickTime container, and the video track is almost the whole file when all you wanted was the sound. M4A is the destination because it plays essentially everywhere — iPhone Voice Memos and every ordinary phone, browser, and player. Storage-wise you're looking at about 50× less: 60 MB per minute becomes roughly 1.2. Both MOV and M4A are lossy, so this pair stacks a second encode — at a generous bitrate it stays inaudible, but if a lossless original of the MOV exists, encode the M4A from that instead.