mp3 encoding bus errors

[ruggerjvd]

I amtrying to use ffmpeg to transform so mp3's from 48000 sampling to 44.1k. I keep getting messages like this:

Encoding started on Wed Dec 31 14:49:03 EST 2003
Input #0, mp3, from '/Users/johnd/Music/iTunes/iTunes Music/AC_DC/Stiff Upper Lip/Meltdown.mp3':
Stream #0.0: Audio: mp2, 16000 Hz, mono, 80 kb/s
sh: line 1: 2221 Bus error /Applications/ffmpegX.app//Contents/Resources/ffmpeg -i /Users/johnd/Music/iTunes/iTunes\ Music/AC_DC/Stiff\ Upper\ Lip/Meltdown.mp3 -y -vn -f mp2 -acodec mp3 -ab 128 -ar 44100 -ac 2 -map 0.1:0.0 -benchmark /Users/johnd/Documents/Newstuff/test2.mp3


One thing I notice is that the source mp3 is not 16000 hz mono, so it's not reading it right.


What could cause this?

Actually, I was able to get it to run when I clicked "invert mapping". I never understood this option, what does it do? Is that the fix?

[rastaruss]

I read somewhere in the manual that Invert Mapping is for formats where autio is recorded ahead of video, or for audio only formats. Regular mapping will look to convert video first, audio second. By inverting, you encode audio first. This is what you want when you are translating audio to audio formats.

I cannot explain the output, but your Invert Mapping button is the right choice.