TFM Audio Filter 1.0 beta 8

TFM Audio Filter is an old DirectShow audio filter that processes the sound of a movie in real time while it plays.

Its main job was taming film soundtracks, squeezing loud explosions and quiet dialogue closer together so you could hear voices without riding the volume.

Version 1.0 beta 8 from 2004 is the last release, and today your player can do the same thing with a single setting.

What TFM Audio Filter Actually Does

It slots into the DirectShow chain that older Windows players use, sitting between the audio decoder and your sound card. Every movie played through that chain passes through it first.

The technique is dynamic range compression, the same thing TVs and AV receivers call night mode. Loud peaks get pulled down and quiet passages lifted, which suits late-night viewing and small laptop speakers.

Who Can Still Use It

It only helps if you still run an old DirectShow player on an older Windows PC and want the exact setup you had years ago. It is a beta that never reached a final release.

It was also fussy back then. Doom9 forum users reported it refusing to connect to the sound card filter with some Ogg Vorbis audio until the decoder was switched to 16-bit integer output.

The tell that you do not need it is a player such as VLC or MPC-BE. Both carry their own audio processing, so a separate system filter adds nothing.

What to Use Instead

Each of these does the job TFM Audio Filter did, and all of them are still maintained.

• VLC Media Player has a built-in compressor under Tools, Effects and Filters, Audio Effects, Compressor. Tick Enable and loud scenes calm down at once.
• MPC-BE has an Auto volume control box under Options, Audio, Sound processing. It evens out loud and quiet passages with no extra filters.
• LAV Filters include a Dynamic Range Compression setting in LAV Audio, with a level slider. It works on Dolby Digital (AC3) and Dolby Digital Plus (E-AC3) tracks only.

LAV Audio also has a Center Mix Level slider in its mixing settings. When a 5.1 track is folded down to stereo, raising it makes dialogue louder against the effects.

LAV is the right fit if you use a DirectShow player such as PotPlayer or MPC-HC.

Our guide to getting more out of your media player with LAV Filters covers the setup.

The closest old-school match is AC3 Filter, which also offers dynamic range compression in one DirectShow filter. It is frozen too at its final 2.6b release, so treat it as a fallback.

If you want to know why Dolby tracks carry this option at all, our explainer on EAC3 audio is a good start. More filters and decoders sit in the Audio Codecs category.

Quick questions

Download TFM Audio Filter 1.0 beta 8 if you still need it, or tell us what you used it for if you have history with it.