@chris25fr
You are confusing terms here. Ogg is a container somewhat like AVI is. Vorbis is the audio codec you used.
Christian is right, we don't use bitrate modes with Vorbis like you are use to using with MP3. If you used HeadAC3he to transcode your AC3 to to Vorbis then for a given Q level it will also display the expect bitrate(ie. Q2 will average around 96kbps).
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