Date: Tue, 2 Sep 2003 12:02:19 -0400 From: Anish Mistry <mistry.7@osu.edu> To: sugiura@kt.rim.or.jp (Sugiura Shiro) Cc: freebsd-multimedia@freebsd.org Subject: Re: How to make high quality MPEG4 video Message-ID: <200309021202.30884.mistry.7@osu.edu> In-Reply-To: <200309021525.AAA26452@mail4.rim.or.jp> References: <200309021525.AAA26452@mail4.rim.or.jp>
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[-- Attachment #1 --] On Tuesday 02 September 2003 11:25 am, Sugiura Shiro wrote: > In article <20030901201341.1e6ff86d.steve@sohara.org> > steve@sohara.org writes: > > >> With that 2.8GHZ P4 you should be able to go direct. I can quite > >> easily record PAL 720x576@25fps in mpeg4 or mpeg1 on my AMD XP2000 in > >> realtime with ffmpeg alone running like this: > >> > >> ffmpeg -s 768x576 -tvstd pal -vcodec mpeg4 -b 2000 -acodec mp3 -ac 2 \ > >> -ab 128 -f avi -t $DURATION -y $NAME.avi > >> > >> It uses about 60% CPU on average, adding -hq pushes it to > >> a bit over 70%. > > Thank you. > I tried to direct encode a sportscast like following: > > % ffmpeg -s 640x480 -tvstd ntsc -vcodec mpeg4 -b 2000 -acodec mp3 -ac 2 \ > -ab 128 -f avi TV.avi > > It uses about 30% CPU on average. > And then, I play TV.avi using mplayer and xine. > But output avi files seems that some frame was droped during capture > and encode. > > >> SS> Step2-2: mpeg4 encode by ffmpeg(strange out put) > >> SS> % ffmpeg -i raw.avi -vcodec mpeg4 -r 29.97 -me full -re -b 2000 > >> SS> -acodec \ > >> SS> copy -deinterlace tv.avi > >> > >> Strange how ? > > Audio stream is OK, but Video stream playbacks 2-3X speed, like Charles > Chaplin movies. > > I tried to direct encode(mpeg1/mpeg4) and rawvideo recode , but in any case , > my mpeg files seems that some frames was droped. I think, I mistook > something, but I don't know what it is. > > First step, I want to know how to setup to recode/encode full frames(29.97fps) > movie. > Try forcing a ntsc frame rate with -r 29.97 > thank you. > > -- > Sugiura Shiro E-mail : sugiura@kt.rim.or.jp > _______________________________________________ > freebsd-multimedia@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-multimedia > To unsubscribe, send any mail to "freebsd-multimedia-unsubscribe@freebsd.org" > > -- Anish Mistry [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (FreeBSD) iD8DBQA/VL8WxqA5ziudZT0RAttZAKDWFDggnegxqrchR+T/EMDocVi+GgCfezrz L6nFL7flw7/QTjhN0vCSxcw= =TRqw -----END PGP SIGNATURE-----help
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