Date: Sat, 15 Apr 2006 02:11:43 -0400 From: Joe Auty <joe@netmusician.org> To: Joe Auty <joe@netmusician.org> Cc: freebsd-multimedia@freebsd.org Subject: Re: ffmpeg question Message-ID: <87716498-15A6-45D5-8FB2-1D4485C592A1@netmusician.org> In-Reply-To: <26EC8B9F-9627-4447-B20F-BF5743CBAEB8@netmusician.org> References: <FAEBE9DA-2556-4F6E-9A50-3D9A22D42805@netmusician.org> <20060415051014.GA20238@puff.jakemsr.gom> <AEB45AE1-6DDE-4D40-B05B-36CCEB9A7186@netmusician.org> <26EC8B9F-9627-4447-B20F-BF5743CBAEB8@netmusician.org>
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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 =) 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" >
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