Sometime you may need to increase audio volume in the existing video file. For example, video recording of the meeting, your video with narration. It is possible to do it! Video file actually contains 2 separate video and audio tracks.
The process of changing the volume of the audio involves taking this video, separating audio track, decoding audio track, processing the resulted audio file to increase volume, and then finally re-merging of the new track into a video file.
Luckily, there are few software tools that take all the work for you. One of them is the HandBrake* free video and audio converter used by thousands of users worldwide.
* ByteScout is not affiliated with HandBrake in anyways. It is just good and free software that we use ourselves.
A. Download awesome free and open-source video converter called HandBrake, developed by the HandBrake community for 15 years. This converter works on Windows, Mac OS X, and Ubuntu. The download page is here
B. Install Handbrake on your computer.
C. Run Handbrake and follow these steps as shown on the screenshot below:
1. Click on Open Source and open your input video file (mp4, WMV, AVI are supported)
2. In the list of tracks Gain knob and turn it right to add gain to the audio track of the computer
3. Now click Start button on the top toolbar to start the conversion. HandBrake will re-code your video file with audio volume (gain) added and will save it to the selected file.