[vorbis] how to calculate frame # for vcut?

[Akos Maroy]

Hi,

I have a question regarding vcut. In the man page, it says:

DESCRIPTION
        vcut  reads  an Ogg Vorbis audio file and splits it at the
        given cutpoint, which is a sample number.

<p>What I want to do, is to cut an Ogg Vorbis file at a given time. Say, I 
have an Ogg Vorbis file, which is 1 hour long, and I want to cut it into 
two half hour parts.

With a fixed bitrate format, the frame number to cut by can be easily 
calculated, but how do I such here?

<p>Akos

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