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ffmpeg°æ±¾:0.5.1 flv -> mp4  ->3gp
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./ffmpeg -i ÊÓƵÎļþ -y -ss ½Øͼʱ¼ä -vframes 1 -f image2 -s 128x96 Ä¿±êÎļþÃû;
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./ffmpeg -i out.3gp -ss 00:00:00 -t 00:00:10 -s qcif -acodec copy -vcodec copy -y preview.3gp
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ffmpeg -i src.flv -vcodec libx264 -vpre normal -vpre baseline -coder 0 -threads 4 -s 320*180 -b 128k -r 15 -padbottom 30 -padtop 30 -f mp4 -y out.mp4
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-vcodec libx264 -vpre normal -vpre baseline -coder 0
¾ßÌ庬ÒåÏê¼ûhttp://rob.opendot.cl/index.php/useful-stuff/ffmpeg-x264-encoding-guide/
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-padbottom 30 -padtop 30
#mp4ת»»Îª3gp
./ffmpeg -i test.mp4 -s qcif -ar 8000 -ac 1 -ab 12.2k -f 3gp -y test.3gp
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¿ÉÒԲο¼http://www.code-life.com/read.php?61
аæµÄamr¿âÔÚÕâÀïhttp://opencore-amr.sourceforge.net/
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--enable-libopencore-amrnb
--enable-libopencore-amrwb
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#ifndef V
#Q      = @
#ECHO   = printf "$(1)\t%s\n" $(2)
#BRIEF  = CC AS YASM AR LD HOSTCC STRIP CP
#SILENT = DEPCC YASMDEP RM RANLIB
#MSG    = $@
#M      = @$(call ECHO,$(TAG),$@);
#$(foreach VAR,$(BRIEF), \
#    $(eval $(VAR) = @$$(call ECHO,$(VAR),$$(MSG)); $($(VAR))))
#$(foreach VAR,$(SILENT),$(eval $(VAR) = @$($(VAR))))
#$(eval INSTALL = @$(call ECHO,INSTALL,$$(^:$(SRC_DIR)/%=%)); $(INSTALL))
#endif