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From: "softworkz ." <softworkz-at-hotmail.com@ffmpeg.org>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Thread-Topic: [FFmpeg-devel] [PATCH] avformat/dump: Change precision of stream
start offsets
Thread-Index: AQHbsjBgmnqibkcbuU+WybiBeSgUerOtjYkAgACP6iCAAGYiAIAABERw
Date: Mon, 21 Apr 2025 19:50:11 +0000
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Subject: Re: [FFmpeg-devel] [PATCH] avformat/dump: Change precision of
stream start offsets
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> -----Original Message-----
> From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of
> Marton Balint
> Sent: Montag, 21. April 2025 21:32
> To: FFmpeg development discussions and patches <ffmpeg-
> devel@ffmpeg.org>
> Subject: Re: [FFmpeg-devel] [PATCH] avformat/dump: Change precision of
> stream start offsets
>
>
>
> On Mon, 21 Apr 2025, softworkz . wrote:
>
> >
> >
> >> -----Original Message-----
> >> From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of
> Gyan
> >> Doshi
> >> Sent: Montag, 21. April 2025 06:51
> >> To: ffmpeg-devel@ffmpeg.org
> >> Subject: Re: [FFmpeg-devel] [PATCH] avformat/dump: Change precision
> of
> >> stream start offsets
> >>
> >>
> >>
> >> On 2025-04-21 01:41 am, softworkz wrote:
> >>> From: softworkz <softworkz@hotmail.com>
> >>>
> >>> Changing this to 6 digits to align with other
> >>> printed times
> >>>
> >>> Signed-off-by: softworkz <softworkz@hotmail.com>
> >>> ---
> >>> avformat/dump: Change precision of stream start offsets
> >>>
> >>> Changing this to 6 digits to align with other printed times
> >>>
> >>> Signed-off-by: softworkz softworkz@hotmail.com
> >>>
> >>> Published-As: https://github.com/ffstaging/FFmpeg/releases/tag/pr-
> >> ffstaging-72%2Fsoftworkz%2Fsubmit_start_offsets-v1
> >>> Fetch-It-Via: git fetch https://github.com/ffstaging/FFmpeg pr-
> >> ffstaging-72/softworkz/submit_start_offsets-v1
> >>> Pull-Request: https://github.com/ffstaging/FFmpeg/pull/72
> >>>
> >>> libavformat/dump.c | 2 +-
> >>> 1 file changed, 1 insertion(+), 1 deletion(-)
> >>>
> >>> diff --git a/libavformat/dump.c b/libavformat/dump.c
> >>> index 8c7db7b275..1bd0424f3d 100644
> >>> --- a/libavformat/dump.c
> >>> +++ b/libavformat/dump.c
> >>> @@ -680,7 +680,7 @@ FF_ENABLE_DEPRECATION_WARNINGS
> >>>
> >>> 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);
> >>> + av_log(NULL, AV_LOG_INFO, ", Start-Time %.6fs",
> >> stream_start);
> >>
> >> The camel case is incongruous with the formatting of the text next
> To
> >> It.
> >
> > Hi Gyan,
> >
> > as far as I'm seeing it, captions/labels are title case and values
> are
> > lower case. I would consider "Start-Time" to be a caption/label.
> Let's
> > look at an example:
> >
> > Stream #0:0[0x8fd]: Video: h264 (High) ([27][0][0][0] / 0x001B),
> yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], Level 40,
> 25 fps, 50 tbr, 90k tbn, Start-Time 32476.588s
> > Stream #0:1[0x907](dut): Audio: mp2 ([3][0][0][0] / 0x0003), 48000
> Hz, stereo, fltp, 256 kb/s, Start-Time 32476.706s
> > Stream #0:2[0x908](dut): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
> 5.1(side), fltp, 448 kb/s, Start-Time 32476.643s
> > Stream #0:3[0x909](GOS): Audio: mp2 ([3][0][0][0] / 0x0003), 48000
> Hz, stereo, fltp, 256 kb/s, Start-Time 32476.674s (visual impaired)
> (descriptions)
> > Stream #0:4[0x962](dut): Subtitle: dvb_subtitle ([6][0][0][0] /
> 0x0006), Start-Time 32476.588s
> > Stream #0:5[0x963](dut): Subtitle: dvb_subtitle ([6][0][0][0] /
> 0x0006), Start-Time 32476.719s (hearing impaired)
>
> I think Gyan means fps, tbr or tbn. These are all lowercase and
> abbreviations.
Yes, I understood that. But these are units, not labels.
> The one-line stream info should be as compact as
> possible.
Agreed.
> So we should make it shorter, and we should lose the "s" unit as
> well.
I'm afraid, but omitting the unit makes no sense to me.
Why?
> Something like:
>
> "in 1234.567"
What means "in"?
Maybe "offset" if it's gotta be short..?
Thanks,
sw
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