ffmpeg: remove lame replaygain tag from mp3

Question

lame is writing a replaygain tag if the option --noreplaygain is not set:

ffmpeg -i testgain_0.mp3
Input #0, mp3, from 'testgain_0.mp3':
Duration: 00:01:00.42, start: 0.025057, bitrate: 192 kb/s
Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 192 kb/s
Metadata:
  encoder         : LAME3.99r
Side data:
  replaygain: track gain - -12.500000, track peak - unknown, album gain - unknown, album peak - unknown,

Can I use ffmpeg to remove the "Side data"? In my trys with map metadata I cannot access this "Side data" to remove it: -map 0:0 -map_metadata -1

There's a [filter](https://ffmpeg.org/ffmpeg-filters.html#sidedata_002c-asidedata) to remove side data but it doesn't seem to work. — aergistal, Aug 09 '17 at 15:05

score 0 · Accepted Answer · answered Aug 09 '17 at 15:38

0

It appears to get removed if you roundtrip it via MP4.

ffmpeg -i testgain_0.mp3 -c copy testgain_0.mp4

ffmpeg -i testgain_0.mp4 -c copy nogain_0.mp3

Or use a pipe for a single-step method:

ffmpeg -i testgain_0.mp3 -c copy -f avi - | ffmpeg -i - -c copy nogain_0.mp3

answered Aug 09 '17 at 15:38

Gyan

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Hi, Mulvya, thanks, but both of the methods produce a frame count mismatch between the Xing header and the audiostream... – fexplorer Aug 09 '17 at 16:48
How are you checking that? – Gyan Aug 09 '17 at 16:51
With [link](http://mp3diags.sourceforge.net/) Maybe, it could be fixed in an additional step.. – fexplorer Aug 09 '17 at 18:55
Only happens here if the original MP3 was trimmed from another MP3. You can suppress the msg with `-write_xing 0` – Gyan Aug 09 '17 at 19:12
Oh, thanks for the hint with `-write_xing 0`. Can you explain, what means the single `-` in `ffmpeg -i - -c copy`? – fexplorer Aug 10 '17 at 17:50

ffmpeg: remove lame replaygain tag from mp3

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