Date: Tue, 18 Apr 2006 08:58:06 -0700 (PDT) From: "R. B. Riddick" <arne_woerner@yahoo.com> To: Joe Auty <joe@netmusician.org>, freebsd-multimedia@FreeBSD.ORG Subject: Re: ffmpeg question Message-ID: <20060418155806.81998.qmail@web30304.mail.mud.yahoo.com> In-Reply-To: <60E1D0F4-190D-46AF-A92E-F7374EA32959@netmusician.org>
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--- Joe Auty <joe@netmusician.org> wrote: > Nothing, except the files are very large... Since I plan to record > every night, this space consumption will add up quickly. > I personnally use this command (and arguments) to compress my PVR250 movies mencoder -ovc lavc -oac mp3lame -noaspect -lavcopts vbitrate=1111 -lameopts abr:preset=50 -o $2 $1 $1 denotes the input file or "-" for standard input (e. g. cat /dev/cxm0 | mencoder..., but this is a little bit risky, when the mencoder process needs more time than the pipe-buffer can compensate; so u should write little chunks (4GB or so - est. 1h) to ur harddisc before u compress them) $2 denotes the output file It is even possible to crop away black stripes (some cinema movies (like Sum Of All Fears have black stripes in the top and in the bottom) with the option -vf crop=720:350 The quality can be adjusted via the vbitrate (I like 1111bit/sec). The problem here is, that mencoder does not save (enough) bitrate in case of slow movements for bad times, where the pictures change more rapidly... So that I have "very" good quality when the pictures dont change and quite bad quality when the people run quickly for some seconds or when there many cuts in the movie for some seconds... Does somebody know, if one can get a certain constant quality instead of a certain nearly constant bitrate? :-)) -Arne __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
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