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audiamus / AaxAudioConverter

Convert Audible aax files to mp3 and m4a/m4b
GNU General Public License v3.0
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2.69GB single m4b file cant be played after conversion #212

Closed bust4cap closed 2 months ago

bust4cap commented 2 months ago

Im using v1.18.2.0 of AAX Audio Converter. Im trying to convert the German version of the "Shogun" audiobook by James Clavell. Its almost 51 hours long and 2.69GB in size. I use Book Lib Connect first to download the audiobook, then AAX Audio Converter to get a better formatted m4b file. Book Lib Connect already creates a single m4b file, and that works perfectly fine, but converting the same AAX file with this software outputs a broken file that cant be played by either media player classic or vlc. Every other audiobook I tried before worked fine, including longer ones that were over 70 hours long. And converting this title in parts works too. These are my settings: aaxsettings

this is the beginning of each file in hex, left is the working file from Book Lib Connect, right is the non working file from AAX Audio Converter: shogunhex

bust4cap commented 2 months ago

It also took significantly longer to convert. This one file took almost 14 minutes with AAX Audio Converter (2.69GB , ~51 hour runtime), while 2 other files took about 8 minutes combined (which had a combined ~94 hour runtime and were 3.1GB in size)

audiamus commented 2 months ago

A log file might tell us more.

Have you tried to split by chapter?

bust4cap commented 2 months ago

split by chapter works perfectly fine.

this is with log level 3 AaxAudioConverter_2024-08-05_001.log

log level 4 AaxAudioConverter_2024-08-05_003.log

audiamus commented 2 months ago

It seems that AAX Audio Converter is using the older 32bit version of FFmpeg here (the default). You could enforce using the 64bit version by modifying FFmpeg64bitHours in C:\Program Files\audiamus\AAX Audio Converter\AaxAudioConverter.exe.config. Set its value to a number of hours shorter than the runtime of the book in question.

bust4cap commented 2 months ago

changed it to 49, made no difference. updated ffmpeg to the newest version (also 64bit), conversion was about 25% faster, but still not playable

audiamus commented 2 months ago

It could be a problem with 3rd party ATL.net which sets the new meta data, both variants, hereby rewriting the .mp4 file. However, there is nothing I can do here for the time being, as AAX Audio Converter has not been migrated to .Net Core yet, but ATL.net has.