This is relatively high but works well for this example. Then I use the -af highpass=400 function to add the highpass filter to the audio stream with a frequency of 400 Hz. This avoids re-compressing the file and saves time. Here I use the -c:v copy to copy the video stream directly. I only needed to add a highpass filter, which can be accomplished using this one-liner: ffmpeg -i input.mp4 -c:v copy -af highpass=400 output.mp4 It has myriad audio filters that can be combined in various ways. So I decided to break my rule of not processing the sound and apply a simple highpass filter to remove the noise.įortunately, FFmpeg, as always, comes to the rescue.

I like the rest of the recording, so I thought it would be a pity to skip publishing this sound action only because of the hum. Recording the dice example, however, I noticed an unfortunate low-frequency hum in the original recording: The original recording has an unfortunate low-frequency hum. For that reason, I only trim the recordings non-destructively using FFmpeg. The recorded files will also serve as source material for both scientific and artistic explorations later. That is because I want to capture sounds and actions as naturally as possible. The final audio footage sounds natural/normal with no clicks and I can keep working on my video projects.The idea has been to do as little processing as possible to the recordings. So my audio wasn't clipping (as expected) but 1.2% !!! samples had clicks which the declip filter interpolated over and effectively removed. Detected clips in 0 of 52983808 samples (0%) This ~9min clip took 30sec to process, it was completely hands off and adeclip and adeclick filters in my case reported following findings: $> ffmpeg -i film-4-kdenlive-clicking.mp4 -codec:v copy -filter:a dynaudnorm=p=0.9,adeclip,adeclick -codec:a aac -b:a 96k film-5-ffmpeg-post-process-of-4.mkv Then use ffmpeg to re-process the container by copying video and declicking the audio and re-compressing into a final audio codec. After finding that the root cause is somewhere between MLT and kdenlive, the simplest instant solution I found is to render my project (9min video) into whatever desired video quality codec I need, but high quality audio (ie. I ran into this bug on kdenlive Version 20.12.1 appimage prebuilt binary (on Linux).

Ffmpeg remove audio static