[FFmpeg-devel] [PATCH] Make ffmpeg -t X with X<=0 transcode nothing

[Michael Niedermayer]

 On Fri, Jul 18, 2008 at 12:27:33AM +0200, Stefano Sabatini wrote:
> On date Thursday 2008-07-17 22:18:08 +0200, Michael Niedermayer encoded:
> > On Thu, Jul 17, 2008 at 08:57:09PM +0200, Stefano Sabatini wrote:
> [...]
> > > But if we can avoid *at all* to transcode then I'm fine, ideally a:
> > > ffmpeg -t 0 -i test.avi -sdp -f rtp -an rtp://test.mpeg > test.sdp
> > > 
> > > should be fine, if *no* transcoding is performed then the return code
> > > tells if we wrote that SDP or not, which isn't guaranteed if we have
> > > to set t > 0.
> > 
> > > So can anyone explain why it is necessary to set t > 0?, attached patch
> > > is a first naive attempt to fix the t>0 issue.
> > 
> > what is t by default? what will you patch do in that case? ...
> 
> Yes, anyway if the user writes:
> ffmpeg -t 0 -i test.avi -y test.mpeg
> 
> then I think he expects to transcode *nothing* rather than the whole
> file, this also according to the docs:
> 
> @item -t @var{duration}
> Restrict the transcoded/captured video sequence
> to the duration specified in seconds.
> @code{hh:mm:ss[.xxx]} syntax is also supported.
> 
> New patch attached, this also doesn't break the default behaviour when
> -t isn't specified.

ok

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

No snowflake in an avalanche ever feels responsible. -- Voltaire
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