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Using ffmpeg:
-ff_encode - 1 and 2-pass encoding using different codecs.
ff_catvideo - concatenate few video files into one.
+ff_cropdetect - detect -vf crop parameters.
+ff_encode - 1 and 2-pass encoding using different codecs.
Using mplayer/mencoder:
m_catvideo - concatenate few video files into one.
+m_cropdetect - detect -vf crop parameters.
m_encode - 1, 2 and 3-pass encoding using different codecs.
m_fix-avi-index - fix an AVI index.
m_recode2mp3 - recode an audio stream to mp3, leaving video stream intact.