Theres a new version of the ac3 plugin available.
I think i may have found a badly suited test file
My testing so far shows (with this file) that the (consistent) problems are with 5.1 to 5.1 (no encoding) and are related to muxing/authoring and not aften.
Fails with every version of batchmux even when the ac3 plugin are fully disabled.
This is with aften 007, 484 or 06 and batchmux 1.4 or 1.3
Ac3 5.1 to 5.1 no encoding = vobs only
Ac3 stereo to stereo no encoding = ok(audio encoded with aften gui and aften 484)
ac3 5.1 to ac3 stereo = ok
mp3 to ac3 stereo = ok
This is with aften 490 and batchmux 1.4 or 1.3
Ac3 5.1 to 5.1 no encoding = vobs only
Ac3 stereo to stereo no encoding = ok (audio encoded with aften gui and aften 484)
ac3 5.1 to ac3 stereo = unreliable results, sometimes ok with closed gops, sometimes not.
mp3 to ac3 stereo = ok
Have still to test dvdauthor only without batchmux and im testing batchmux 1.4 and the newest ac3 plugin
So ive got no real conclusion to share yet other than use the latest batchmux and the latest ac3 plugin(or atleast aften 007)