CODEWITHSUNDEEP
ffmpeg
cannyboy
cannyboy

Reputation: 24446

ffmpeg to cut beginning and fade in audio

I've got a bunch of spoken word mp3 files, which all have the same intro talking and music, and then the real content begins. So it goes roughly like this:

00:00 Standard intro spoken word
00:20 Standard intro music
00:35 The content

The timings are not always the same (can vary by 5 secs). So I'd to cut the first 25 seconds and then fade in the next five seconds. And then output the file in the same mp3 format. Is this possible with ffmpeg?

Upvotes: 7

Views: 6123

Answers (2)

Puddle
Puddle

Reputation: 3355

I was just looking how to trim the audio in a video and just figured this out:

ffmpeg -i input.mp4 -ss 10 -to 20 -i input.mp4 -map 0:v -map 1:a -c copy -copyts output.mp4

We use -i input.mp4 twice (for video/audio) and select with -map 0:v and -map 1:a.
Then we can put -ss 10 -to 20 before our audio input to trim it.
Then we need -copyts so the audio input begins at the same timestamp.
And we use -c copy to not re-encode so it's faster.

Use -c:v copy if you want to re-encode, since the video doesn't need re-encoding, only the audio.

Hope this helps anyone.

Upvotes: 1

Lex
Lex

Reputation: 534

This command should work for you:

ffmpeg -ss 25 -i input.mp3 -af "afade=type=in:start_time=0:duration=5" -c:a libmp3lame output.mp3

-ss 25 will start the input after the first 25 seconds.

afade filter will fade in the audio from the specified start time for the next 5 seconds.

Upvotes: 14

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