Date: Sat, 15 Apr 2006 18:04:16 -0700 From: Vayu <vayu@sklinks.com> To: freebsd-multimedia@freebsd.org Subject: Re: ffmpeg question Message-ID: <200604151804.16919.vayu@sklinks.com> In-Reply-To: <87716498-15A6-45D5-8FB2-1D4485C592A1@netmusician.org> References: <FAEBE9DA-2556-4F6E-9A50-3D9A22D42805@netmusician.org> <26EC8B9F-9627-4447-B20F-BF5743CBAEB8@netmusician.org> <87716498-15A6-45D5-8FB2-1D4485C592A1@netmusician.org>
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On Friday 14 April 2006 23:11, Joe Auty wrote: > Got it! > > This bug is fixed in ffmpeg-devel... > > I think I'm good now. > > > I hope my thinking through this problem outloud on the list will be > of some use to some, and not simply spam. I'll try to be quiet now =) > Well if you're offering use to others I have two questions. What is /dev/cxm0, is it your video camera? What do you mean "fixed in ffmpeg-devel", do you mean you can compile a newer version? > On Apr 15, 2006, at 1:53 AM, Joe Auty wrote: > > > Okay, I think I figured this out.... almost: > > > > ffmpeg -i /dev/cxm0 -vcodec copy -acodec copy -t 20 test_ffmpeg.mpg > > > > > > Except doing this completely ignores my -t 20 and keeps on > > recording after 20 seconds... why is that? > > > > > > On Apr 15, 2006, at 1:14 AM, Joe Auty wrote: > > > >> > >> On Apr 15, 2006, at 1:10 AM, Jacob Meuser wrote: > >> > >>> On Fri, Apr 14, 2006 at 11:54:18PM -0400, Joe Auty wrote: > >>>> Hello, > >>>> > >>>> Doing a: > >>>> > >>>> cat /dev/cxm0 > myvideo.mpg > >>>> > >>>> produces great mpeg2 video... However: > >>>> > >>>> ffmpeg -i /dev/cxm0 -t 10 test_ffmpeg.mpg > >>>> > >>>> produces 10 seconds of mpeg1 video that doesn't look as good. > >>>> > >>>> > >>>> I've tried adding -f <format> and -vcodec options with -s 640x480, > >>>> but I just can't seem to find something that will reproduce my raw > >>>> feed without errors, loss of picture, the size being off, or > >>>> reverting back to mpeg1. > >>>> > >>>> To save me a little further time in just random trial and error, > >>>> can > >>>> anybody hook me up with the combination I need? > >>> > >>> sorry, but what exactly are you trying to do? what is lacking with > >>> the cat command? > >>> > >>> most likely, if you are running a transcoder (like ffmpeg, mencoder > >>> or transcode), it is decoding the input into raw YUV or RGB and then > >>> back to MPEG. this is a lossy and time/cpu consuming process. > >>> > >> > >> The cat command works perfectly, but I'm trying to script it, and > >> since you can use ffmpeg to specify how many seconds of footage to > >> capture I'm trying to make this work. > >> > >> According to Quicktime's Get Info, the cat files are mpeg2... I'd > >> like to know the best way to preserve the same quality from the > >> cat command using ffmpeg. > >> > >> Am I starting to make sense now? > >> > >> > >> _______________________________________________ > >> 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" > > > > _______________________________________________ > 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" >
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