Re: [FFmpeg-devel] [FFmpeg-cvslog] avformat/dump: Print stream start offsets for input streams

[Gyan Doshi <ffmpeg@gyani.pro>]

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=02d7384ed5eec0152056c081b536c16cb86e6361
> ---
>
>   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


> +    }
> +
>       dump_disposition(st->disposition, log_level);
>       av_log(NULL, log_level, "\n");
>   
>
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