AC3 To AAC Transparently

[Bathrone]

As part of my MP4 transcodes of Pal DVD media, I want to not change the audio, or atleast, remain standards compliant by having AAC audio streams in my MP4 container and not AC3 audio streams.

So, if I transcode in belight into aac at the same bitrate using cbr with high quality nero codec mode without enabling anything else like normalisation or gain is this the right way to go?

I just want aac audio without actually changing the sound.

[kotrtim]

Use Nero "normal" vbr instead, but normal should produce a bigger file than 448 kbps, your best bet is "streaming" which should be more or less the same bitrate as ac3

So, if I transcode in belight into aac at the same bitrate using cbr with high quality nero codec mode without enabling anything else like normalisation or gain is this the right way to go?
answer from faq


Dolby Digital/AC3 FAQ


General AC3 Procedures Questions

3. What's the difference between normalization and dynamic range compression?

Normalization applies gain to all the audio, essentially multiplying everything by a common factor in order to max out the use of the 16 bits you have in most wav files. Normalization preserves the dynamics of the original recording, meaning that the relationship between loud and soft stays the same, except that everything is now louder by the same factor.

Dynamic range compression basically amplifies softer parts more than louder parts, to bring soft and loud closer together and lessen the contrast between, say, explosions and background music.

so normalisation is a no loss process, dynamic compression is a lossy process where the dynamic is changed




I just want aac audio without actually changing the sound.

Use only normalise but nothing else