ffmpeg command line for compressing DV to MPEG1
ffmpeg -i dv-video.avi -s 384x288 -vcodec mpeg1video -b 300 -g 48 -ac 1 -ab 64 -ar 32000 364kbs-video.mpeg
-s : Scale to this size (scale to exactly half height, and get deinterlaceing for free)
-vcodec : Video codec. mpeg1video implies mp2 sound.
-b : Video bitrate. 300 kb/s is enough where there is little movement.
-g : Distance between keyframes. With little movement, fewer keyframes are good.
-ac : Number of channels. We are only recording one channel.
-ab : Audio bitrate in kb/s. 64 kbits is OK for one-channel speech.
-ar : The audio sample rate. Lower sample rate reduces compression artifacts.
--
Herman Robak
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