crash on finishing re-muxing (mp4 audio-only file)

What steps will reproduce the problem? 1. add a mp4 audio-only track (and a txt chapters-file) 2. remux as m4a (the original file was not seekable, because it was the raw stream recorded from internet radio with VLC, hence my need of re-encapsulating it) . Subler correctly imports the original metadata and artwork found in the original file (previously added with Kid3) 3. add to queue, process the file.

What is the expected output? What do you see instead? 1) Given that there is NO conversion (I select PASSTHROUGH), the process is much longer than expected : more than one hour for a 3-hour audio-only file. I tested also on a six-minute long file and the ratio is the same. 2) in the end, my file is properly remuxed, but Subler crashes and exits at the end of the process (whereas the file is correctly written on disc

What version of the product are you using? On what operating system? Subler Version 0.31 (0.31) running on MAC OS 10.6.8

Please provide any additional information below. __Full crash report attached

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