BS FAG will fix audio gain in movie and music files to proper volume level with clipping sound prevention. Supports movies with multiple audio tracks and international file names. Result movies could also be converted to other format. For Windows 7+ 64-bit.
Adjustable desired audio volume level.
Supports movies with multiple audio tracks.
Videos and subtitles tracks are untouched.
Convert result movies to other format.
Language supports: cn, en, de, id, in, fr, jp, kr, pt, ru, sa, sp
🎤 Meeting recordings — ensure clear, consistent audio for business archives
💍 Wedding videos — balance speeches, vows, and music without distortion
🎓 Lecture or seminar recordings — improve clarity for study and sharing
🎶 Music collections — normalize tracks for smooth playback
🎬 Home movies — fix uneven sound levels across clips
🎧 Professional audio work — DJs and music composers can refine tracks, balance mixes, and process high‑quality formats audio without losing fidelity
🎥 Movies & Dramas — production houses can polish audio tracks, prevent clipping, and deliver consistent sound quality across scenes and episodes
Tested on 3GP, AVI, MKV, MOV, MP4, MPG, WMV, MP3, WMA, AAC, FLAC, and more.
😇 Make sure to create backup before fixing.
Maximum 5 minutes video files
Maximum 2 minutes audio files
🎖️ Purchase 1-Year License for only USD 3.79 and get rid Trial Limitation or buy from Microsoft Store for lifetime license.
Unlike loudness normalization (loudnorm) tools, BS FAG is designed to preserve peak fluctuation while aligning playback levels to your chosen dB SPL target. This makes listening more comfortable without sacrificing the dynamic character of the audio.
BS FAG recalibrates each peak individually, keeping significant gaps intact. The result is a lively, natural sound where quiet and loud moments remain distinct.
loudnorm applies a global gain shift to reach a LUFS target, then limits peaks to avoid clipping. This can reduce peak gaps and slightly compress dynamics, producing smoother but less varied playback.
With BS FAG, you hear audio closer to its original performance — balanced around your target SPL, yet still dynamic. This approach is often more demanded by everyday listeners who value natural variation, while loudnorm remains best suited for broadcast and streaming compliance.
BS FAG does not force audio into MP3 format during processing. Instead, it intelligently selects the most appropriate temporary format based on the source file. This ensures even high quality audio can be fixed without issues.
Add video or music files by pressing "Add" button or drag drop from Windows Explorer. The files will be read for their information.
Open "Options" if needed by pressing "Options" button.
Set "Audio level" to desired volume. Acceptable values are 30.0 dB - 99.0 dB. Ideally is 89.0 dB.
Select "Ignore clipping sound" if you wish.
Select "Analyze only" to skip gain fixing but show the gain value that could be applied. (v4.2)
Select "Replace original files" to activate. Be sure on selecting this option as the fixes will be permanent.
Select "Do not pass" to force rebuild although volume level is already achieved.
Give check marks on the list to select items to process.
Press "Analyze" or "Fix" button to start the process.
After finished fixing, the successed result video will be in the defined folder and the list will show gain value applied.
Enjoy the new videos and music files with proper audio volume level on computers, smartphones, DVD players, TV, anywhere!
Notice: The audio might be converted as it will alter its quality. Although similar original audio specification will be applied, the result will be more or less different.
FFmpeg is copyrighted by the FFmpeg developers (http://www.ffmpeg.org)
mp3gain is copyrighted by Glen Sawyer (http://mp3gain.sourceforge.net)
aacgain is copyrighted by Dave Lasker (dave@altosdesign.com)