Help with FFMPEG

[David_erh]

Hello everybody, I have a recording from my camera "vid_orig.avi" and the size is 5MB when I converted it with "cowon video converter" the final size is 2.2 MB;i did it whit a recording from my desktop called "sample.avi" with a size to 144MB and after converted with "cowon video converter" the final size was 20MB. I want to do this work with FFMPEG in Linux but i'm newbie with FFMPEG. those are the video details:

VIDEO1 BEFORE COWON VIDEO CONVERTER:
Seems stream 0 codec frame rate differs from container frame rate: 200.00 (200/1) -> 52.50 (105/2)
Input #0, avi, from 'sample.avi':
Duration: 00:17:23.48, start: 0.000000, bitrate: 1163 kb/s
Stream #0.0: Video: cinepak, yuv420p, 322x249, 52.50 tbr, 200 tbn, 200 tbc
At least one output file must be specified

VIDEO1 AFTER COWON VIDEO CONVERTER:
Input #0, avi, from 'sample_mod.avi':
Duration: 00:17:23.46, start: 0.000000, bitrate: 163 kb/s
Stream #0.0: Video: mpeg4, yuv420p, 320x240 [PAR 1:1 DAR 4:3], 30 tbr, 30 tbn, 30 tbc
At least one output file must be specified

VIDEO2 BEFORE COWON VIDEO CONVERTER:
Input #0, avi, from 'vid_orig.avi':
Duration: 00:00:45.66, start: 0.000000, bitrate: 654 kb/s
Stream #0.0: Video: mjpeg, yuvj422p, 160x120, 15 tbr, 15 tbn, 15 tbc
Stream #0.1: Audio: pcm_u8, 8000 Hz, mono, s16, 64 kb/s
At least one output file must be specified

VIDEO2 AFTER COWON VIDEO CONVERTER:
Input #0, avi, from 'vid_mod.avi':
Duration: 00:00:45.60, start: 0.000000, bitrate: 266 kb/s
Stream #0.0: Video: mpeg4, yuv420p, 160x120 [PAR 1:1 DAR 4:3], 15 tbr, 15 tbn, 15 tbc
Stream #0.1: Audio: mp3, 44100 Hz, stereo, s16, 128 kb/s
At least one output file must be specified

I hope you can help me becouse I want to find out how to obtain the same results with FFMPEG.

And sorry for my bad English.

Thanks

David

[Baldrick]

Try google for "ffmpeg examples" to see how ffmpeg works, like start with http://www.linuxjournal.com/article/8517 and then http://forum.videohelp.com/topic338564.html for more info.