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Re: package for basic examination of .dv video files?



On Mon, Nov 02, 2009 at 08:23:00PM -0430, Patrick O'Callaghan wrote:
> On Mon, 2009-11-02 at 19:42 -0500, Robert P. J. Day wrote:
> > On Mon, 2 Nov 2009, Patrick O'Callaghan wrote:
> > 
> > > On Mon, 2009-11-02 at 13:49 -0500, Robert P. J. Day wrote:
> > > > is there a package of basic .dv video file utilities, particularly
> > > > for just *examining* the properties of a .dv file?  i've yum
> > > > searched and nothing jumps out at me.  i'm just after some
> > > > command-line utilities that allow me to *inspect* the innards of
> > > > various video file formats, not necessarily do any
> > > > transformations.  thanks.
> > >
> > > Try tcprobe (part of the transcode package). I don't know if it
> > > handles DV but it's easy to test.
> > 
> >   yup, that's a start, but i'm not sure how to parse the output:
> > 
> > $ tcprobe -i sample.dv
> > [tcprobe] Digital Video (NTSC)
> > [tcprobe] summary for sample.dv, (*) = not default, 0 = not detected
> > import frame size: -g 720x480 [720x576] (*)
> >      aspect ratio: 4:3 (*)
> >        frame rate: -f 29.970 [25.000] frc=4 (*)
> >       audio track: -a 0 [0] -e 32000,16,2 [48000,16,2] -n 0x1 [0x2000] (*)
> >                    bitrate=1024 kbps
> > $
> > 
> >   i'm unfamiliar with the output format of tcprobe, so what's the deal
> > with two different frame sizes being printed?  and two different frame
> > rates?  how should i interpret that?  thanks.
> 
> Yes, I've often wondered that myself :-) The manual is silent on this
> subject. However a possible interpretation is that the bracketed numbers
> indicate defaults. Thus 720x480 is a 4x3 aspect ratio but the actual
> frame size is different so the video will be distorted. Transcode can
> crop, pad or rescale it to the correct ratio if required.

I suspect those are to honor NTSC vs. PAL differences.  The former is
a North American standard, the latter European (and IIRC most other
places).  Is that output really showing you the contents, or is it
just making recommendations on how it would be imported?  No idea.

-- 
Paul W. Frields                                http://paul.frields.org/
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