You may have two MP4 videos of the same source. One is of better image quality but poorer audio; the other one is just the opposite. Now you want to merge the better audio with the better video, how to do that?
The easiest way is to re-wrap the needed audio stream into the first MP4 container. As the MP4 container can hold unlimited audio tracks, you can choose to replace the original audio track or make a multi-track MP4. Here we provide a step-by-step guide on how to add an audio track to MP4 with a powerful video processing program. Learn details below.
The tool we will use to add audio tracks to MP4 is WonderFox HD Video Converter Factory Pro. It is a feature-rich program with various multimedia solutions, one of which is to modify the audio and subtitle tracks inside a video file. It can remove or the add audio track to video without the need to re-encode the file, which means that the video quality won’t be damaged and the process will be much faster, too. Besides adding audio tracks to MP4, it can also insert multiple audio tracks to MKV and MOV, add subtitle files to MP4, extract audio from video, etc.
* Before you put the audio track to MP4, make sure that the audio and video are of the same length to avoid any “audio out of sync” problems.
Launch HD Video Converter Factory Pro on your PC and open the “Converter” module. Next, click the center + button to import your MP4 file into the program. You can also drop the source video into the interface directly.
Tips. At the bottom of the interface, click the triangle button to specify an output path or leave it as default.
Head over to the right side of the program where you see the format image. Click on it to unfold the output format list. Then, go to the “Video” category and select “MP4” as the output video container.
Return to the main workspace, click the + button next to the “Audio Track” section and add your external audio track file to the MP4. Then, from the Audio Track drop-down options, select or deselect the audio track you want to keep or delete.
At the “Parameter settings,” you can modify the audio parameters like the codec, channel, bitrate, and sample rate as the original metadata.
Finally, hit “Run” to finish the process. It should be done quickly, and you can view the output file in the folder you set before.
That’s all for how to add an audio track to MP4 with HD Video Converter Factory Pro. You can try this software to add another audio stream to the MP4 file now. By the way, this software is not limited to adding additional audio track to MP4, but it is also capable of converting video files, compressing large videos, recording PC screen, making animated GIFs, etc. Free download Free download it to explore more features.
I hope you find this article helpful. Thanks for reading!