How to merge and cut theora videos, and how to synchronize sound?

"Lucas Malor" <[email protected]>
Newsgroups gmane.comp.multimedia.ogg.theora.general
Message-ID <[email protected]> 
Hello. Excuse me in advance for these dumb questions.

I used ffmpeg2theora to convert much videos. Now I would cut and/or merge them. How can I do it?

Furthermore, in many cases the sound was desynchronized - I converted TS mpegs. I tried to add the sync flag with bad effects. How can I manually delay / anticipate sound track?
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