I am not sure why it is working in 0.9.3 but I would clearly expect it to fail in this case.
The reason is that in the code your are using, if no "length" metadata is passed, mp3 length is computed by decoding the entire file, which is clearly too cost-intensive with such a file.
I can propose you two (in fact 3) alternatives:
- Do not use the length option
- Pass a "length" metadata. I have not read the code yet but I think I remember that in this case, the length is taken from this value and thus does not require computing the file's length
- Try the current seek branch in our HG code. This branch has a support for computing mp3 length that should be much less cost-intensive. The changes in this branch should eventually make it into the default branch soon..