Your video's real problem is the sound

01

What clean-up can fix

Steady background noise such as a fan, an AC hum or distant traffic can be reduced well with modern tools. Uneven levels, where one person is loud and another quiet, can be balanced. Mouth clicks, small pops and harsh "s" sounds can be softened. Volume can be set to a consistent level so viewers are not reaching for the volume button.

These fixes are part of a normal edit. On talking videos, testimonials and corporate films they take a good share of the editing time.

02

What it cannot fix

Heavy echo in an empty hall, a voice recorded from too far away, wind blasting into the microphone, two people talking over each other, or music playing loudly in the background of speech are very hard to repair. Clean-up tools can improve them a little, but often at the cost of making the voice sound thin or robotic.

Distorted audio, where the recording was so loud it clipped, is mostly unrecoverable.

If the important line was recorded badly, re-recording it later and syncing it is often quicker than repairing it.

03

Distance matters more than the microphone

The single biggest improvement is getting a microphone close to the speaker's mouth. A basic clip-on lapel mic a hand's width from the chin beats an expensive camera microphone three metres away. Even a second phone recording a voice memo in the speaker's pocket is better than the camera's built-in mic across the room.

04

Choose the room for its sound

Hard, empty rooms echo. Rooms with curtains, carpets, sofas and bookshelves sound much better. Switch off fans and ACs for the few minutes of recording if you can, and close windows on the road side. Record ten seconds of the room in silence too: editors use it to remove noise cleanly.

05

Music should sit under speech

Background music that fights the voice is one of the most common problems in business videos. In the edit, music is lowered whenever someone speaks, a process called ducking. If you are filming with music playing in the venue, ask for it to be paused during interviews or speeches.

06

Weddings and events are special cases

At weddings and functions, the most important audio is often the hardest to capture: vows over nadaswaram, speeches through a hired PA system, relatives talking near the mic. The best results come from recording directly from the sound system's mixer where possible, plus a lapel mic on whoever is speaking, plus the camera's own audio as backup.

In the edit, the editor picks the cleanest source for each moment and blends them. When there is only camera audio from the back of the hall, speeches can be improved but rarely made crisp. If a speech matters to you, tell your videographer in advance so they plan a proper audio source for it.

Test before you film

Most audio disasters are discovered in the edit, when it is too late. Thirty seconds of testing at the shoot avoids them: record a short clip, play it back on headphones, and listen for hum, echo, rustle and level.

If it sounds bad in headphones at the shoot, it will sound worse on a phone speaker.

Check the lapel mic is not rubbing on clothing, the battery is charged, and the recorder is actually recording. It sounds obvious; it is also the most common reason a perfect take has no usable sound.

Can a video editor remove background noise?

Yes, steady noise such as fans, AC hum and distant traffic can usually be reduced well. Echo, wind and loud music behind speech are much harder and may only improve slightly.

What is the cheapest way to improve audio in a video?

Get a microphone close to the speaker. A basic wired or wireless lapel mic close to the mouth improves sound far more than an expensive camera microphone further away.

Is audio clean-up included in video editing?

Basic clean-up, level balancing and music mixing are part of a normal edit. Heavy repair of badly recorded audio takes extra time and may be quoted separately.