audio only vob -> wav

[ashe]

Hello
I have been trying to create mp3s out of the audiotrack of a DVD(specifically Woodstock). I'm ripping to wave first so I can do a bit of editing. I ripped an audio only vob with vStrip. Now I've been trying to use BeSweet to convert the vob to a wave. The only results I've been able to get are a wave with lots of distortion, like it went over line level and got whacky. What am I doing wrong?

I know the vob is fine because I've listened to it with PowerDVD.

Thanks

[western shinma]

It would be better if you demuxed the AC3 from the DVD rather than making audio VOBs. Those are primarily used with Graphedit.

[Tes]

Or even better, use the PCM audio track if there is one. I believe DVD2AVI can demux PCM tracks.

[BinyaminGavriel]

I have a related problem - I can't seem to extract an ac3 from an audio only vob that I created using vstrip. I don't have access to the original DVD, so I can't rerip the whole thing from scratch, but I do have this audio only vob file. Any suggestions

[FakerZ]

Have you tried loading this audio vob into dvd2avi ?
Another suggestion, why not trying Vob2audio ?

[BinyaminGavriel]

yes, I tried loading it in dvd2audio, but I can't save (it's grayed out). I can only save when i load a full (video+audio) vob

[BinyaminGavriel]

vob2audio doesn't seem to work either - the file loads (once I created a lst file for it), but nothing shows in the audiostream box.

[Tes]

Try Bbdmux: http://www.doom9.org/Soft21/Vobtools/bbtool19.zip

[BinyaminGavriel]

Thanks. BbDmux worked to extract the ac3 from the vob, but I'm still having difficulty limiting the final ogg size.

[Tes]

To limit the resulting size just change the quality setting until you get your desired file size/quality. If you did not already know, you can use floating point values for the quality setting like 3.578, 4.9999999, 5.25, etc.

If you want to try a slightly better quality codec for high bitrate audio take a look at MPC. http://www.uni-jena.de/~pfk/mpp/
The --xtreme setting creates files with average bitrate around 200kbps. It is also less demanding on cpu resources than Vorbis.

[BinyaminGavriel]

what I was getting at concerning the size is this. According to what I've read, using the ogg method at the same quality should give me a file size about 5 Mb smaller than the corresponding mp3 file. One movie that I ripped worked out this way: the mp3 that I created using vob2audio was 76 Mb, while the corresponding ogg file at quality setting 4.90 was 71 Mb. The second movie I tried this on, with identical settings, gave me a 73 Mb mp3 file, and a 93 Mb ogg file. This is what I don't understand. Perhaps someone has a good way to compare bitrates of mp3's and ogg's (seeing as how the ogg bitrate is apparently not accurate).
Ben

[Tes]

Since the Vorbis quality settings are variable bitrate, different source files will give different resulting .ogg file sizes depending on the source material (even if the source files are the same size). The person/people that claimed that Vorbis files are typically 5 MB smaller than a comparable mp3 file was/were probably using an average over a certain group of files. And since you didn't mention what settings were used to create the comparable mp3 I can't comment on how the quality compares (although Vorbis will most likely be higher quality than mp3 at equivalent bitrates).

Your second clip must have been "harder" to encode therefore causing more bits to be used by the Vorbis encoder. It appears that the mp3 encoder decided to use fewer bits than the Vorbis encoder. Although that is a significant difference in file size for "comparable" results. If you wish to reduce the file size more just lower the quality setting.

Here is one person's take on the quality settings and the resulting bitrates:

Originally posted by gnoshi
... the vorbis compressor filter has its own 'quality' setting.
If you are using graphedit, you access this by right-clicking on the vorbis compressor, and bringing up its properties.

The quality settings go roughly like this:
0 = 64kbps
1 = 80kbps
2 = 96kbps
3 = 112kbps
4 = 128kbps
5 = 160kbps
6 = 192kbps

it is not a smooth transition between 4 and 5 though, because at 5, lossless channel coupling comes into play which causes a significant jump in bitrate to 160ish, whereas 4.99 is a tad lower than that.
[snip]