[FFmpeg-devel] [PATCH v2 1/2] avformat: add AVFormatContext.first_pkt_wallclock

[Anton Khirnov]

Quoting Gyan Doshi (2022-07-01 13:07:13)
> 
> 
> On 2022-07-01 03:20 pm, Anton Khirnov wrote:
> > Quoting Gyan Doshi (2022-06-28 08:40:58)
> >>
> >> On 2022-06-28 10:43 am, Anton Khirnov wrote:
> >>> Quoting Gyan Doshi (2022-06-25 10:29:50)
> >>>> Stores wallclock time for the first packet received.
> >>>> Used for crude sync offset among inputs.
> >>>> ---
> >>>>    doc/APIchanges         |  3 +++
> >>>>    libavformat/avformat.h | 10 ++++++++++
> >>>>    libavformat/demux.c    |  3 +++
> >>>>    libavformat/options.c  |  1 +
> >>>>    libavformat/version.h  |  2 +-
> >>>>    5 files changed, 18 insertions(+), 1 deletion(-)
> >>> Why should this be in the library? Seems to me this can be just as
> >>> easily done by the callers who need it.
> >> To not add some extra latency,  just like how
> >> `use_wallclock_as_timestamps` was implemented inside lavf.
> > Where would that extra latency come from?
> 
> The interval between its current assigment inside ff_read_packet() and 
> the chance for assignment in process_input() in ffmpeg.c

And why would there be a significant delay there?

-- 
Anton Khirnov