[QUOTE=olyteddy;2306922]If they play in VLC you can use that to convert them to MP3. That option is available from the ‘Advanced Open File’ page, there’s a dropdown next to the ‘Play’ button that has ‘Convert’ as an option. If you need chapters, you can use MP3 DirectCut to chop the resulting MP3 file up.[/QUOTE]
thanks - that’s a well hidden feature - took me a while to find it even with your instructions.
it’s also very slow though - looks to be designed primarily for video conversions & I can’t see any way to set up a batch conversion.
there must be somthing out there that is optimised for m4b to mp3, which will also match the m4b bit rate quality settings.
as it’s speech only the mp3 bit rate probably only needs to be in the 40-50 range, otherwise the mp3 files will be far bigger than the m4b ones.
stupidwindows wont tell me a bit rate for apple format filess but I maybe have a utility that will… yes GSpot does it for me: the 1st file I want to convert is reported as
mp4a: MPEG-4 AAC LC 32000Hz 32 kb/s , mono (1/0)
mp3 direct cut looks good as some of these files are 6 hours long! but I don’t want cuts to occur mid-sentence so I’ll have to experiment with settings.