>>91860142Oh, wow, 12 hours is indeed a long file but ffmpeg should be able to handle it; it's designed for it; it's a tool meant to batch process thousands of files, no matter how big, so it has to work.
A 12 hour file would have 43200 seconds.
At an average bitrate of 128 kb/s that is 5529600 kb.
That is 691200 kB, or 675.2 MiB. That's a pretty big file for audio only content.
I don't know if you created that file yourself, but when you download things from Youtube, you can usually download the audio in OPUS format but also in AAC format (M4A). I think opus is smaller in size, but if you can't use it, I'd use AAC (M4A) rather than MP3 or flac.
