[FFmpeg-user] Detect interlaced video
u at pkh.me
Tue May 13 22:31:00 CEST 2014
On Tue, May 13, 2014 at 10:20:34PM +0200, Oliver Fromme wrote:
> Carl Eugen Hoyos wrote:
> > Oliver Fromme <oliver <at> fromme.com> writes:
> > > Actually I had hoped that there is a flag somewhere
> > > on the DVD, either in the meta data or in the MPEG2
> > > stream itself, indicating whether a title is
> > > interlaced or progressive.
> > The flag tells you if the stream was encoded using
> > mpeg2video interlaced or mpeg2video progressive, but
> > to decide whether or mot to deinterlace a video, only
> > the actual content is relevant: Progressive content
> > is often encoded as interlaced and it is of course
> > possible (although unlikely) that interlaced content
> > is encoded using progressive frames.
> Ok, thanks for the explanation. So I will just use the
> idet filter to determine whether deinterlacing is required.
> By the way, does it hurt to use the yadif filter on frames
> that are not interlaced?
While it might be fine for playback, it will probably alter non interlaced
frame a lot. You might want to use the timeline system of libavfilter to
enable the filter in some specific time ranges.
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