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Questions tagged [ffmpeg]

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0
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1answer
78 views

exporting .wav as .m4a creating 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
vote
1answer
301 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
39 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
245 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
42 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??)...
11
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1answer
2k 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 ...
2
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0answers
879 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 ...
1
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1answer
1k 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
243 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
115 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 ...
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0answers
671 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. ...