[Ffmpeg-devel] Wrong duration in a nut container

[Michael Niedermayer]

Hi

On Fri, Aug 12, 2005 at 02:31:19PM +0200, Hendrik Schmal wrote:
> Hi,
> 
> Am Freitag, 12. August 2005 01:14 schrieb Michael Niedermayer:
> > Hi
> >
> > On Thu, Aug 11, 2005 at 02:47:03PM +0200, Hendrik Schmal wrote:
> > > Hello,
> > >
> > > I want to grab a video from tape (via framegrabber (bt8x8), no audio,
> > > SuSE Linux 8.2). I use the FFMpeg-20050806.tar.bz2 package.
> > >
> > > The following commandline (see below) should give me a video containing
> > > 250 frames (that means 5secs on 50fps).
> > >
> > > With the avi format I get a duration of 5 secs. The nut format shows me a
> > > wrong duration, but it also contains 250 frames.
> > > This happens when for example the tape partially contains no data.
> > >
> > > The same behaviour I have using the FFmpeg API (libavformat/libavcodec).
> > >
> > > I can't use avi, because of my videos are larger than 1GB.
> > >
> > > Is this a bug or did I something wrong ?
> >
> > nuts duration field is in a info packet and thats neither stored nor read
> > currently, patch welcome
> 
> Really neither stored nor read currently ? I found out that nut works fine 
> (with a correct duration) if I grab from a reliable video source (like 
> tuner).

ffmpeg guesses the duration from bitrate and filesize, theres also code for
finding the duration from seeking and timestamps but it doesnt work with
nut, i dunno why not

[...]

-- 
Michael