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From: "softworkz ." <softworkz-at-hotmail.com@ffmpeg.org>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [FFmpeg-cvslog] avformat/dump: Print stream start offsets for input streams
Date: Sun, 20 Apr 2025 20:07:14 +0000
Message-ID: <DM8P223MB036529041AE8C07479C6C7CFBAB92@DM8P223MB0365.NAMP223.PROD.OUTLOOK.COM> (raw)
In-Reply-To: <4607d003-bd32-4f47-9a07-fec3233eed45@gyani.pro>



> -----Original Message-----
> From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of Gyan
> Doshi
> Sent: Sonntag, 20. April 2025 13:25
> To: ffmpeg-devel@ffmpeg.org
> Subject: Re: [FFmpeg-devel] [FFmpeg-cvslog] avformat/dump: Print
> stream start offsets for input streams
> 
> 
> 
> On 2025-04-19 08:35 pm, softworkz wrote:
> > ffmpeg | branch: master | softworkz <softworkz@hotmail.com> | Sat
> Feb 23 04:59:10 2019 +0100| [02d7384ed5eec0152056c081b536c16cb86e6361]
> | committer: softworkz
> >
> > avformat/dump: Print stream start offsets for input streams
> >
> > Seeing the offset of video and audio streams to each other is often
> > a useful metric in diagnosing and understanding issues with playback
> > or transcoding.
> > This commit adds those offsets to the stream info print.
> >
> > Signed-off-by: softworkz <softworkz@hotmail.com>
> >
> >>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=02d7384ed5ee
> c0152056c081b536c16cb86e6361
> > ---
> >
> >   libavformat/dump.c | 5 +++++
> >   1 file changed, 5 insertions(+)
> >
> > diff --git a/libavformat/dump.c b/libavformat/dump.c
> > index 3d37623a41..8c7db7b275 100644
> > --- a/libavformat/dump.c
> > +++ b/libavformat/dump.c
> > @@ -678,6 +678,11 @@ FF_ENABLE_DEPRECATION_WARNINGS
> >               print_fps(1 / av_q2d(st->time_base), "tbn",
> log_level);
> >       }
> >
> > +    if (st->start_time != AV_NOPTS_VALUE && st->start_time != 0 &&
> st->time_base.den && st->time_base.num) {
> > +        const double stream_start = av_q2d(st->time_base) * st-
> >start_time;
> > +        av_log(NULL, AV_LOG_INFO, ", Start-Time %.3fs",
> stream_start);
> 
> This should use the same precision as the other timestamp printouts,
> to
> avoid subtle inaccuracies.
> For a single-stream MPEG-TS , ffmpeg prints "start: 1.466667" for the
> format and "Start-Time 1.467s" for the stream.
> 
> Regards,
> Gyan
> 


Yup, that makes sense. New patch coming.

Thank you,
sw

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      reply	other threads:[~2025-04-20 20:07 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20250419150541.A8EF7411BF6@natalya.videolan.org>
2025-04-20 11:24 ` Gyan Doshi
2025-04-20 20:07   ` softworkz . [this message]

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