[FFmpeg-devel] HLS Segmenter and the "hls_time" option

[Ibrahim Tachijian]

Steven, I am not sure you understood me correctly or perhaps I did not
explain myself optimally.

We still want to split by keyframe in a normal fashion. But, for example,
would like the first 5 segments to have an "hls_time" of 1s and the rest of
the segments after the first 5 to have an "hls_time" of 5s.

An made up option would be (hls_time_initial Seconds,Number)

   - "-hls_time_initial 1,5 -hls_time 5"

The output playlist would contain segments (split at keyframes) 5 segments
of length 1s and then any segment after the initial 5 segment would be 5s.

Is it clear what I am trying to explain?

What do you think? Do you know how this can be achieved?

Thanks,

On Fri, Aug 26, 2016 at 2:06 AM Steven Liu <lingjiujianke at gmail.com> wrote:

> 2016-08-26 7:39 GMT+08:00 Ibrahim Tachijian <barhom at netsat.se>:
>
> > Hello,
> >
> > I've been thinking about an option for "hls_time" that is not currently
> > supported by FFMpeg and I would like feedback to if some of you may think
> > this is useful or utterly unnecessary.
> >
> > I find scenarios where we sometimes want to create an HLS output and
> would
> > like the *first couple of segments* to be shorter than the *rest of the
> > segments.*
> >
> > For example starting off with 1s segments up to N segments then switch to
> > 5s segments.
> >
> > The reasoning is simply to have the playlist.m3u8 and first segment
> > available *asap.*
> >
> > What do you think? Do you know how this can be achieved?
> >
> > Thanks,
> >
>
> ffmpeg split segment use hlsenc by keyframe, if you want to split segment
> *ASAP*,
> you can try set your streaming *GOP(Group Of Picture)* shorter,
> for example: gop_size = 60,  c->time_base = (AVRational){1,60};
> in command line : -r:v 60 -g 60
>
> if can accept split segment at non-keyframe, you can use hls_time and
> hls_flags split_by_time.
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