Andrey Utkin <andrey_utkin <at> fastmail.com> writes:
>
> On Mon, 22 Feb 2016 17:23:06 +0000 (UTC)
> Carl Eugen Hoyos <cehoyos <at> ag.or.at> wrote:
>
> > Andrey Utkin <andrey_utkin <at> fastmail.com> writes:
> >
> > > As it was discussed today on #ffmpeg and #ffmpeg-devel,
> > > only IDR frames are considered safe seek points by design
> > > of H.264.
> >
> > Since valid H264 streams without IDR (and without I) frames
> > exist, this cannot be true.
>
> Haven't heard of such streams, but let's take it granted. Why does it
> mean that above statement is false? If there's no IDR frames, then
> it is safe to assume that this stream has no seek points guaranteed to
> be valid (unless we introspect the references between frames). I don't
> see anything wrong with such statement.
Sorry for being unclear:
Since valid, useful H264 streams with many ("safe") seek points
but without I or IDR frames exist, the statement "only IDR frames
are safe seek points" can't be true.
Carl Eugen
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