Part 1: Convert iPhone Video to Audio on iPhone and iPad. Method 1: Convert iPhone Video to MP3 Using Shortcuts. Method 2: Use Video to Audio Converter App from App Store. Part 2: 5 Best MP4 to MP3 Apps for iPhones and iPad. Step 1. Upload MP4 video files into MP4 to audio converter. Step 2. Choose MP3 audio as output format. You could also adjust the audio sample rate and birate by clicking the setting gear. If satisfied, click the bottom " Convert " button to start the conversion. Step 3. OS X does not ship with any MP3 encoder apart from the one in iTunes. For converting to mpeg4 audio you can use the CLI command afconvert (afconvert -h for available options). 3. Choose the desired output format. Select MP3, one of the other available audio file formats or click Other or custom to see profiles for specific devices. 4. Start the MP4 MP3 conversion. Once the output format is configured, click the Start button. The progress will be displayed in the File Format view, next to the files. It is a common audio format for consumer audio streaming or storage and a de facto standard of digital audio compression for the transfer and playback of music on most digital audio players. MPEG-4 Part 14 or MP4 is a digital multimedia format most commonly used to store video and audio and store other data such as subtitles and still images. How to convert MP4 to MP3 Step 1 Upload mp4-file (s) Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page. Step 2 Choose "to mp3" Choose mp3 or any other format you need as a result (more than 200 formats supported) Step 3 Download your mp3 Let the file convert and you can download your mp3 file right afterwards How to Convert MP4 to MP3? Click the “Choose Files” button to select your MP4 files. Click the “Convert to MP3” button to start the conversion. When the status change to “Done” click the “Download MP3” button Step 1. Run Free HD Video Converter Factory and step into the " Converter " model. Click on " Add Files " button or execute a drag-n-drop to add multiple MP4 files you want to convert. Step 2. Once the files are all loaded, click on the Format Image on the right side to unfold 500+ configured presets. Step 3. bGZx.