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libvorbis.dll, BeSweet, and CoreVorbis, a few questions
McGee
post May 20 2004, 01:57
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In the past I used OggDS with BeSweet for encoding movie audio, but now I'm looking at libvorbis.dll. I'm also switching from OGM to Matroska, and possibly from OggDS to CoreVorbis for playback. I had a few questions before I start ripping, though:

1) The GT3b2 version of libvorbis.dll seems to be the one to use, according to QuantumKnot's recommendations, but the aoTuV version of the encoder is the one competing in the big ABX test. Is there a "libvorbis.dll using aoTuV" version available somewhere? Is one on the horizon?

2) Are there any known problems with Ogg files encoded by BeSweet using the GT3b2 version of libvorbis.dll?

3) Are there any known problems with using CoreVorbis to play back such files?

4) Is Q6 still the lowest quality setting at which stereo coupling is lossless with GT3b2?

5) My tentative plan is to use BeSweet + libvorbis.dll GT3b2 for encoding at Q5 for main audio and Q1 for commentary tracks on 2CD rips. Does this seem like a sensible plan?

A couple of these questions might be best asked at Doom9 or CoreCodec but I wanted to know what you guys have to say. Thanks in advance!
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Latexxx
post May 20 2004, 07:34
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2. No
3. No, they are just standard vorbis files.
5. I'd use q0 for commentary.
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xmixahlx
post May 20 2004, 08:55
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5. you might even want to try aotuv @ q -2 (~45kbps) for commentary - it gives pretty impressive results...


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john33
post May 20 2004, 09:54
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1). No, there isn't an aoTuV libvorbis.dll at the present time. Once there is a final released version of the modified source, creation of the dll is a simple exercise.

The libvorbis.dll is nothing more than an amalgamation of the four separate dlls that you would normally get. Considering many people will want to use the dlls for both encoding and decoding, it seemed simpler to me to require only one dll rather than four. wink.gif

Using this dll provides identical output, whether encoding or decoding, compared to the standard set of dlls, or any other use of the libraries when statically linked.


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Chez_Wimpy
post May 20 2004, 13:19
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QUOTE (McGee @ May 19 2004, 04:57 PM)
5) My tentative plan is to use BeSweet + libvorbis.dll GT3b2 for encoding at Q5 for main audio and Q1 for commentary tracks on 2CD rips. Does this seem like a sensible plan?

If you are doing a 2 CD rip, I would certainly keep the ac3 tracks as they are. I suppose if it is a 5.1 mix, and the movie is near 3 hours in length, I might drop back to using vorbis... but a q5 vorbis on a standard stereo 192kbps ac3 seems a pointless transcode to me.

As for the commentary, I used to encode mono q1, but recently I have shifted to encoding mono vbr HE-AAC. Saves a lot more space.


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McGee
post May 21 2004, 02:25
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Going with mono on the commentary and leaving the ac3 uncompressed if it's 192kbps are both very good ideas. I'll do some listening tests with GT3b2 on mono at q1 and below and see how low I can go.
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bond
post May 21 2004, 10:01
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QUOTE (McGee @ May 21 2004, 02:25 AM)
leaving the ac3 uncompressed if it's 192kbps are both very good ideas

keeping ac3 only makes sense if you want to keep multichannel/want to play the file in a standalone player

i for myself never kept a 2.0 ac3. for me it doesnt make any sense, i always transcoded to 96kbps vorbis which gives me more bitrate for the video stream


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QuantumKnot
post May 23 2004, 11:44
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I don't remember which version of aotuv I used to make these dlls. Just do a test to see whether it is beta 2 smile.gif

http://rarewares.soniccompression.com/quan.../aoTuV-dlls.zip
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