I’m trying to create a bunch of MP3 recordings of exactly 2 seconds in length. I edited them in Audacity and saved them as Audacity projects. Everything is exactly 2.00 seconds long when I do so. But, when I export the audio to MP3 and then re-open the MP3 file in Audacity, the file is now 2.038 seconds long.
I’ve tried reinstalling Audacity, but I get the same results.
I’ve attached one of the recordings, with both the aup and mp3 files.
I’m using Windows 10, Audacity 2.1.2, installed from EXE installer.
Thanks for the info. I see that it’s exactly 2.00 seconds if I use WAV format. I tried reducing the length to 1.96 seconds in Audacity and when I export to mp3 it pads it out to 2.011 seconds, so that’s about as close as I can get.
How about using Ogg Vorbis? http://www.vorbis.com/
File size is similar to MP3. Sound quality is similar (better at high bit-rates). Possible patent issues of MP3 are avoided, and Ogg does not have the problem of padding at the start of the file.