DVDFab DRM Removal DOES reencode the AAC track!!!

jonsan

I have rented a movie that I previously bought a while back when Requiem still worked. The size of files with the drm removed differed quite alot, so I did what I've allways do with iTunes movies, scrubbed the metadata with ffmpeg and demuxed the files.

The movie and AC3 track is identical, did a byte compare with UltraCompare and they are identical, however the AAC track in the file that been processed by DVDFab was 25 000 kB smaller than the aac track processed by requiem.

Only reason for this is that the aac track have been reencoded (yes, the process speed with DVDFab feels that its slower than Requiem so this is probably the reason.)

I don't want to hear an excuse that the aac have addition metadata in it that needs to be removed, because that I have checked earlier also by buying the same movie from 2 different iTunes markets with 2 different accounts and they match up exactly the same.

Any comments from DVDFab on this?

october262

Did you read this - http://forum.dvdfab.cn/showthread.php?t=30696

jonsan

Should have maked it more clearly that I'm talking about AAC tracks in movies and not audio files...

The following is taken from the faq:

Q: What kind of format is output after removing DRM?
A: For movies, M4V format, it's lossless and same as source, and will also keep the AC-3 audio, cc subtitles etc.

...but I will say it's not, because the AAC track in the M4V movie file is reencoded.

Quantumleap

How exactly do you determine that DVD Fab does a reencode?
Only by the filesize?

jonsan

Because I have rented a movie that I previously bought some months ago when Requiem still worked. I then scrubbed the files from metatags and demuxed them. Did a byte compare with UltraEdit and that gives me the result mentioned before. Video & AC3 stream are exactly identical. However, the AAC stream from the newly downloaded processed by from DVDFab is: 113105960 byte and the one that Requim did is 138603914 bytes. This is just a too big differens even if DVDFab cleaned out some addition metadata.

And before anyone else jumps in and say that the requiem files contain traceable metadata in the aac tracks, I can say this. I did when Requiem still worked, just to be sure, buy the same movie from 2 different iTunes stores with 2 different identities and downloaded them on 2 differen VM's with different IP's.
Scrubbed the metatags with FFMPEG, remuxed with mkvtoolnix and compaired the outcome. Except for the few bytes in the beginning that is the Unique ID that changes every remux, the output are identical.

Dora

jonsan
I tried aac audio in movie.

You can use media info compare it.

If still has doubt, give me a movie link