Questions tagged [ffmpeg]

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1answer
38 views

Split audio by frequency

I would like recode wav files from stereo to 4 channels - front channels with low frequencies and back channels with high frequencies only; to store wav files on DLNA server and play on receiver in bi-...
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1answer
21 views

Possible to ffmpeg encode an MP3 media segment for HLS to follow existing MP3?

My use case is essentially DIY internet radio. I've abstracted the real-world constraints into a toy problem for simplicity, but these constraints are real for me. I'm shipping a 24/7 live HLS stream ...
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0answers
28 views

Can the ffmpeg `loudnorm` extension be used to guarantee a maximum volume in an audio file?

I'm looking at a way to ensure an audio file doesn't ever get too loud, but I do not want to change the samples if it is under a given threshold. For example, I would like the file to have a maximum ...
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0answers
30 views

How to create a sense of motion in stereo audio

I have a :15 mono audio file of a car driving by. What I would like to do is use that as the input to create a stereo audio file where the sound 'moves' from left speaker to right for better realism. ...
0
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1answer
49 views

How can I improve on my post processing using ffmpeg?

My goal is to record a video and then upload it without any further manual post production. Except for the sound which I can do with the push of a button using ffmpeg. So far I managed to remove the ...
1
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1answer
36 views

How to decide bitrate for converting wav file to opus file with highest quality

ffmpeg -i file.wav -ab 320k newfile.opus I don't know how to decide the value to set for the -ab option. But my overall goal is to convert wav file to opus file with high quality, and delete the wav ...
1
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1answer
325 views

How to input noise values in dBFS for ffmpeg silence detect

I used the silencedetect of ffmpeg with noise value of -30dB to get the silent parts of a small video file & used those timestamps to trim(remove) & re-encode the silent parts of the video. I ...
1
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1answer
76 views

How to make all sound be at approximately the same level?

I tried to use normalize (in Audacity and in ffmpeg), but it seems there is still room for improvement. Is it possible to do something better than normalize?
2
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1answer
986 views

Linear loudness normalization in FFMPEG is in fact dynamic

I followed this post to normalize the loudness of a clip. I first measure the loudness: $ ffmpeg -i "Take109 000-012.wav" -filter:a loudnorm=I=-24:TP=-9:LRA=5:print_format=summary -f null - ... [...
2
votes
1answer
240 views

Reasonable compressor settings for radio and podcasts

I am moving from software engineering to audio production. I read a good deal about audio editing (mostly from Transom.org) and I want to produce audio for both radio at -24 LUFS and podcasts at -16 ...
0
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1answer
71 views

Loudness normalization makes file four times larger

I have several WAV files that I pass through FFMPEG's loudness normalization: ffmpeg -i input.wav -filter:a loudnorm=I=-24:TP=-9:LRA=7 output.wav The output files are on average four times larger (4....
1
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0answers
136 views

How to use a jack route as a single audio-filter with ffmpeg

I have configured Ardour and there, An audio track takes input from a Jack-Sink device Applies some effects by using some Aux-Send Outputs the final audio to Master which is a Jack-Client Now, I ...
1
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0answers
92 views

ffmpeg silenceremove on 2 track audio

Is there any way to use silenceremove on file with 2 audio tracks, to trim silence only when the silence is on both audio tracks? File info: .mp4 with 2 stereo audio tracks(aac) I've already tried ...
3
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1answer
472 views

What is the real time from sample number?

I apologize if this is the incorrect forum for my question, so please point me to the right place if it doesn't belong here. I thought I understood how SMPTE timecode works, but I cannot seem to ...
1
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1answer
694 views

Why is exporting a .wav file as .m4a creating a sync issue in audacity?

Edit: it's 0.0330s delay, not half a second sorry. ALso the problem occurs when converting the wav to .m4a in ffmpeg using the basic ffmpeg -i input.wav output.m4a, and I used the newest release of ...
1
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1answer
744 views

Audio file in shorter in m4a than in PCM

I recorded a voice memo that shows a length of 10:22 in iTunes. I convert it to PCM with ffmpeg -i input.m4a -c:a pcm_s16le -f s16le temp.pcm and then back to m4a with ffmpeg -f s16le -i temp.pcm -...
0
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1answer
47 views

How can these wav/mpeg files be the exact same duration—down to the (apparent) millionth of a second?

I'm working on a project that involves many different .wav files. In checking out some attributes of these files, I noticed something strange: The duration of all the files looks to be chunked in some ...
0
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2answers
2k views

How to change volume of a .wav file in a mp3gain-like way?

Well, i have a bunch of WAVE files for a Fallout 3 mod, but in the mod instructions the author only explains how to accomplish it using mp3gain (and of course for .mp3 files). The only info it have is ...
0
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1answer
166 views

How to change channels in audio (from BOTH to LEFT) without re-encoding/conversion?

lets say I have very long audio file, and I want to remove only right channel from BOTH (stereo) channels. Can that be done without re-encoding, just simply switching off one channel? (maybe FFMPEG??)...
12
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1answer
7k views

Why does ffmpeg's conversion from mono to stereo lower the volume?

We start with this mono file: test.wav In audacity it looks like this: Then we convert it to stereo with this command: ffmpeg -i test.wav -ac 2 out.wav Now it looks like this: Notice that the ...
4
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2answers
2k views

Repair audio file without header

We recorded the audio of a rather long meeting of a couple of hours on a phone. Someone forgot to turn off sound recording at the end of the meeting and the phone must have turned off due to low ...
2
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1answer
2k views

Understanding how ffmpeg's silenceremove filter correlates to Adobe Audition

I have a bunch of audio files (more than 4000) that I want to trim the leading and trailing silence from, that's where ffmpeg comes in. For instance in the image bellow, the command I'm using is $ ...
2
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2answers
439 views

Dynamic amplification of a sound file

I have a 60-minute WAV file of a conversation. Here is a 600kB clip from it: https://www.dropbox.com/s/m00d525v34bwbpa/needs-levelling.wav?dl=0 One voice is very quiet and I would like to amplify it....
0
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1answer
271 views

Using .wav files works fine in DAW while using converted .mp3 files doesn't

I am working on Arch Linux and am trying to create an intro movie for my Youtube channel. The idea is to play "intro.mp3" which is played only once and then "loop.mp3" which will be playing on low ...
1
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0answers
1k views

Intelligent downmix of stereo to mono

Is there a technique for intelligently downmixing stereo to mono with FFmpeg or similar? As we know, a signal phased between the left and right channels can cancel each other out when mixed together. ...