[FFmpeg-user] Use force_key_frames to obtain keyframes at exactly the same positions as in the input stream?

[Anatol]

Henk,
Live streaming, not files.

On Sat, May 2, 2015 at 10:32 PM, Henk D. Schoneveld <belcampo at zonnet.nl>
wrote:

>
> > On 02 May 2015, at 21:11, Anatol <anatol2002 at gmail.com> wrote:
> >
> > Henk,
> > Its a real problem, if the streams are un-aligned, the playback gets into
> > jump-forward-backward mood.
> If you create a 5min source file and split in 5 1 minute chunks with the
> help of the hls function of ffmpeg.
> Then create 3 other quality streams form these chunks.
> This results in a total of 4 hls compatible streams where switching
> between each of them should be without any problem I think.
> > It's not a problem to get source file key frames and to have them encoded
> > into the rest of the files.
> > The problem is with a live streaming, because it is not possible to query
> > it for the keyframe lications
> >
> > Reuben,
> > The whole idea is to avoid intense CPU consumption for LIVE streaming.
> >
> >
> > On Sat, May 2, 2015 at 8:31 PM, Reuben Martin <reuben.m at gmail.com>
> wrote:
> >
> >> On Saturday, May 02, 2015 06:00:32 PM Haris Zukanovic wrote:
> >>> My case is live streaming.
> >>> I have tried it and definitely keyframes are not aligned between input
> >>> and output streams.
> >>> For all encoded output streams it is very simple to obtain alignement
> >>> with setting the fixed GOP size. But the PTS and keyframes of input are
> >>> never aligned with that.
> >>>
> >>
> >> I’ve had success with it as long as I encode all the derivative streams
> at
> >> once from the same encoder process. This of course can consume
> significant
> >> CPU
> >> resources.
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