ffmpeg question

[Vayu]

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?
> >>
> >>
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> >
> 
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