M4A files are widely accepted by Apple, Android and Windows devices. Most media players on all devices can play M4A files. This makes them a popular format for storing songs on mobile devices. Although M4A and MP4 files are similar, they are not the same. They both use the MPEG4 codec, but M4A files can only store audio content. M4A is Apple’s modification of MPEG-4 (MP4) media container containing audio files. Since the original media container could contain various data — video, audio, and others — Apple created its own extensions that would allow users to distinguish exactly what content is inside the file. Convert MP4 to M4A online for free. 1: Choose multiple local MP4 files or enter the URL of an online MP4 file. 2: Choose "M4A" as target format and set options. 3: Click the "START CONVERSION" button to convert MP4 files to M4A online. CHOOSE FILES. Best way to convert M4A to MP4 files in seconds. 100% free, convert in the cloud, no need to download or install any software, safe and easy to use! OnlineConvertBox — A useful cloud tool that can solve audio and video file conversion problems anytime, anywhere. Aimersoft Video Converter Ultimate is another M4A to MP4 converter that can be used for free or purchased for more features. Aside from MP4 to that of MP4, it can convert videos to a lot of supported output formats. It operates on a lossless conversion technology without the need for the processes of decoding and recoding. Yes, you can convert AUP files from iPhone, iPad and other mobile devices, because AnyConv AUP Converter is a multi-platform web service. Free online AUP converter. Batch convert files from aup and to aup in seconds 👍 Converting files with AnyConv is easy! For instance, the below command would execute in a near instant. If YouTube will honor it, maybe try the below cmd and then using a tool like mp3tag, embeed 720p cover art into the mp4 file. YouTube might then use the cover art as the "video" portion. ffmpeg -i audio.m4a -c:a copy output.mp4. 3. Download for Free. Download for Free. Step 2. Add your M4A files. Locate the M4A files you want to convert and drag-and-drop them into the program’s window. The application can convert big batches of files – there’s no limit to how many files you can transfer at once. Step 3. Select MOV as the output format. In the Formats menu, select 9obJsZ.