I have a huge problem… I am converting (and cutting) over 2,000 audio files. And I need them precisely trimmed, with NO silence at the beginning of the track and no silence at the end. The problem is that when I cut/trim the file perfectly in audacity, and then export the file… it seems fine, but when I open the fiile back up in Audacity (or any other audio app), there is silence (a leader) at the beginning of my file…!!! Why does audacity not export the EXACT trim? It keeps adding back some silence at the beginning.
Super frustrating when editing audio that needs to match a video. As a workaround, after I export, I import the new mp3 so it shows up as a second track (still in Audacity). I zoom in and highlight how much silence got added, then open the mp3 in an old version of WavePad (1.0), zoom in and highlight that same amount, delete, and save.
You are replying to an ancient topic (10 years old).
The LAME encoder can now add a bit of metadata to the MP3 to tell the decoder how much padding has been added. MP3 decoders that support this feature are then able to automatically remove the padding so that the start time and length are exactly correct. The special tag is called “–nogap” because it allows albums that are split into multiple MP3 files to be played in sequence without gaps between the files