As input for this function, you will need to add your file or, optionally, a file URL. A file URL should be used for files larger than 2GB. You may also add the desired bitrate of the converted MiniTool Video Converter – Your NO.1 YouTube Downloader. MiniTool Video Converter is a free, simple and no ads YouTube downloader app which doesn’t include any I'm trying to mix a MP3 audio file into a MP4 video. After hours of searching, I've concluded that I need to convert the MP3 files to an AAC format, which would fit in a MP4 container. Add audio to video in android. But I can't find any documentation on how to convert the MP3 files into AAC format. Open File Manager. Go to the launcher and open "File Manager" from the menu. 2. Open the Media folder. There will be a folder named "Media" in the phone's memory. Open it. 3. Create new Folder. Create a new folder with the name of "Audio" inside the "Media” folder. 3) Accountlab. This is a slick app that in addition to letting you convert videos to audio, will also let you cut audio or video files, acting as a very decent audio/video editor. This will open cmd in the folder. Now type the following command to merge the mp3s. This command takes all the mp3s in order and creates a merged file named merged.mp3. copy /b *.mp3 merged.mp3. Now use the following command to convert the merged.mp3 to m4b. ffmpeg -i merged.mp3 -c:a aac -vn merged.m4b. Simply upload the MP4 file in step 1, then select the MP3 format and click "Convert". All! After the file conversion process is completed, you can download it. ⏳How long does it take to convert MP4 to MP3 ? It all depends on the size of the file you are uploading. Then go to Tools > Convert to Audio Tools > Video to Audio. 2. Select a video from your Gallery, File Manager, Video files, or somewhere else containing video files. Then the video will be converted to audio automatically (You can also convert the voice to text, translate, or copy it as desired). 3. 6k7c9Or.