Pls. advise me tools for authoring DVD that keep audio in AC-3 with max.bitrate at 640 Kbps. Thank so much in advance.
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Well, it might be possible to do it this way: if the ac3 audio is already 640 kbps then just use AVSTODVD and select "Audio Direct Stream Copy" (edit title/audio) so the program won't try to convert the audio. But yeah, 640 kbps is not DVD compliant, the max. bitrate allowed is 448 kbps.
Last edited by jovopros; 7th Nov 2012 at 04:50.
I converted a bunch of CDs to AC3 640 kbps, and then use GfD to author them, as "audio titlesets".
These played fine on my DVD player, and a friend's I tried it on.
Since these are actually DVD video files, muxing a static image with the audio, I expect GfD could use the the same kind of audio with a normal video file. But I haven't tried that.
Apparently out of spec, but may play regardless.
I'm glad it happened to work for you AlanHK, but I would expect it to NOT work correctly for many/most users and would NEVER recommend it.
BTW, what was the sample rate for those conversions? Before-the-fact was surely 44.1kHz, after was it 44.1kHz or 48kHz?
It could also be that as "Audio Titlesets" this may conform to the DVD-Audio spec (and if so, you could tell because the data would mainly exist in *.AOB files in the AUDIO_TS folder), and that spec may have more compliant options WRT bitrates and/or sample rates.
I only used the 640 kbps for a purely audio collection of all 14 Beatles' albums, there was enough space to fit on a DVD at maximum bitrate (about 3 GB I think) so I gave it a try and it worked.
(Of course I couldn't hear the difference between 480 and 640, and I doubt anyone could, so it's overkill.)
If you want 640 kbps AC3, just try it.
What you "expect" may or may not be what actually happens.
You couldn't do it for a commercial DVD, but it works on the (small number of) DVD players I've tried it on.
I often use it to add an OST album to a DVD of the relevant show/film.
I adapted the script it uses and also use it to make my own single image videos, for instance, to create an MPG from a podcast (MP3 converted to 128 kbps AC3) to add to a DVD video compilation. Just adds a few MB overhead, much less than making a normal fps black screen video, for example.
Ac3 448kbps is the maximum u can dream about in dvd specification and authoring. 640kbps is meant for bluray authoring.
Last edited by AlanHK; 8th Nov 2012 at 21:47.
This is the likely scenario:
Somebody downloaded a copy of some MKV movie, from Blu-ray rip, which has untouched audio.
Person converted to "DVD" in whatever encoder/all-in-one. He also wants to keep untouched audio.
But that's not possible, given the restraints of DVD-Video specs.
(1) Buy the Blu-ray. <-- preferable option
(2) Downconvert the audio.