lame wrong metadata information

[adismsc]

Hi,
how can I remove metadata (writing library) from mp3 file? When I use lame I can remove encoding settings by switch, but I can't remove encoder information. Encoding with ffmpeg save additional metadata like encoding settings... I want to remove all of them. It is possible?


Main problem is writing library information. Sometimes information is saved normally (LAME3.98.4), sometimes not (LAME3.98÷ăRĆumôL, LAMEŞŞ’...) and sometimes information is not saved. Is there any standard for it ?! . If this metadata is required - no problem but I want to save it in this form -> "LAME3.98.4"... Not this "LAME3.98÷ăRĆumôL" and not this "LAMEŞŞ’" and no other... Only encoder/encoder version and nothing else. Please help.

[atreyu]

Hey,

I tried to emulate your problem so I encoded an MP3 (that already had ID3 metadata) w/ffmpeg but the resultant MP3 had NO metadata (or at least no id3 tags). Anyway, I usually edit my MP3 metadata in Linux with id3v2. Maybe take a look at that.

[adismsc]

I think it's not id3 tag.
After command

id3v2 --delete-all test.MP3

Results:
first file

Audio
Format                           : MPEG Audio
Format version                   : Version 1
Format profile                   : Layer 3
Mode                             : Joint stereo
Mode extension                   : MS Stereo
Duration                         : 30s 119ms
Bit rate mode                    : Constant
Bit rate                         : 128 Kbps
Channel(s)                       : 2 channels
Sampling rate                    : 44.1 KHz
Compression mode                 : Lossy
Stream size                      : 469 KiB (100%)

second file

Audio
Format                           : MPEG Audio
Format version                   : Version 1
Format profile                   : Layer 3
Mode                             : Joint stereo
Mode extension                   : MS Stereo
Duration                         : 30s 119ms
Bit rate mode                    : Constant
Bit rate                         : 128 Kbps
Channel(s)                       : 2 channels
Sampling rate                    : 44.1 KHz
Compression mode                 : Lossy
Stream size                      : 469 KiB (100%)
Writing library                  : LAME3.98.4

Two files encoded by the same command.. It's encoded from WAV file to MP3

[atreyu]

Yeah, it appears you're right. It must be stuff crammed into the header of the file that is outside the scope of the ID3 stuff.

What command are you using to generate the output from those files?

[adismsc]

pacpl -t mp3 --bitrate 128 --channels 2 --encoder lame --eopts="-m j -t --cbr" "test.WAV" --outfile "test_tmp"

or

lame -t -m j -b 128 --cbr test.WAV test_tmp.mp3

same results...

[atreyu]

Here's another possibility - check out ExifTool. I used it a while ago and forgot about it. Maybe it can help you.

[adismsc]

Hmm... ExifTool don't show any information about "writing library" but mediainfo shows this information

[atreyu]

Cool...does mediainfo support writing to the metadata?

[adismsc]

Unfortunately not