ffmpeg version 0.4.6, Copyright (c) 2000, 2001, 2002 Fabrice Bellard
usage: ffmpeg [[options] -i input_file]... {[options] outfile}...
Hyper fast MPEG1/MPEG4/H263/RV and AC3/MPEG audio encoder

Main options are:
-L                  show license
-h                  show help
-formats            show available formats, codecs, protocols, ...
-f fmt              force format
-i filename         input file name
-y                  overwrite output files
-t duration         set the recording time
-title string       set the title
-author string      set the author
-copyright string   set the copyright
-comment string     set the comment
-pass n             select the pass number (1 or 2)
-passlogfile file   select two pass log file name
-b bitrate          set video bitrate (in kbit/s)
-r rate             set frame rate (in Hz)
-s size             set frame size (WxH or abbreviation)
-croptop size       set top crop band size (in pixels)
-cropbottom size    set bottom crop band size (in pixels)
-cropleft size      set left crop band size (in pixels)
-cropright size     set right crop band size (in pixels)
-vn                 disable video
-bt tolerance       set video bitrate tolerance (in kbit/s)
-maxrate bitrate    set max video bitrate tolerance (in kbit/s)
-minrate bitrate    set min video bitrate tolerance (in kbit/s)
-bufsize size       set ratecontrol buffere size (in kbit)
-sameq              use same video quality as source (implies VBR)
-ab bitrate         set audio bitrate (in kbit/s)
-ar rate            set audio sampling rate (in Hz)
-ac channels        set number of audio channels
-an                 disable audio

Advanced options are:
-map file:stream    set input stream mapping
-em_rate            makes img reading happen at nominal frame rate
-g gop_size         set the group of picture size
-intra              use only intra frames
-qscale q           use fixed video quantiser scale (VBR)
-qmin q             min video quantiser scale (VBR)
-qmax q             max video quantiser scale (VBR)
-mbqmin q           min macroblock quantiser scale (VBR)
-mbqmax q           max macroblock quantiser scale (VBR)
-qdiff q            max difference between the quantiser scale (VBR)
-qblur blur         video quantiser scale blur (VBR)
-qcomp compression  video quantiser scale compression (VBR)
-rc_init_cplx complexity  initial complexity for 1-pass encoding
-b_qfactor factor   qp factor between p and b frames
-i_qfactor factor   qp factor between p and i frames
-b_qoffset offset   qp offset between p and b frames
-i_qoffset offset   qp offset between p and i frames
-rc_eq equation     
-rc_override qualities for specific intervals  Rate control override
-vd device          set video grab device
-vcodec codec       force video codec ('copy' to copy stream)
-me method          set motion estimation method
-dct_algo algo      set dct algo
-idct_algo algo     set idct algo
-er                 set error resilience
-ec                 set error concealment
-bf frames          use 'frames' B frames (only MPEG-4)
-hq                 activate high quality settings
-4mv                use four motion vector by macroblock (only MPEG-4)
-part               use data partitioning (only MPEG-4)
-bug param          workaround not auto detected encoder bugs
-ps size in bits    packet size
-strict how strictly to follow the standarts  strictness
-debug              print specific debug info
-ad device          set audio device
-acodec codec       force audio codec ('copy' to copy stream)
-deinterlace        deinterlace pictures
-benchmark          add timings for benchmarking
-hex                dump each input packet
-psnr               calculate PSNR of compressed frames
-vstats             dump video coding statistics to file
-bitexact           only use bit exact algorithms (for codec testing)
-vhook module name and parameters  insert video processing module
