in ffmpeg asset detailed info for files like HDV info is guessed, for files like mov / mp4 you sometimes can get detection working.
code lifted from dump.c and ffprobe.c
From 40096ee369bb9175c4dfc9350cd58b4311df5c89 Mon Sep 17 00:00:00 2001 From: Andrew Randrianasulu <[email protected]> Date: Sun, 7 Jan 2024 19:16:14 +0300 Subject: [PATCH] Add guessed/detected SAR/DAR values to ffmpeg asset info --- cinelerra-5.1/cinelerra/ffmpeg.C | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/cinelerra-5.1/cinelerra/ffmpeg.C b/cinelerra-5.1/cinelerra/ffmpeg.C index e95cc87e..47e811b2 100644 --- a/cinelerra-5.1/cinelerra/ffmpeg.C +++ b/cinelerra-5.1/cinelerra/ffmpeg.C @@ -2544,6 +2544,27 @@ int FFMPEG::info(char *text, int len) enum AVColorRange range = st->codecpar->color_range; const char *rg = av_color_range_name(range); report("/ range:%s\n", rg ? rg : unkn); + + AVRational sar = av_guess_sample_aspect_ratio(fmt_ctx, st, NULL); + if(sar.num) { + AVRational display_aspect_ratio; + av_reduce(&display_aspect_ratio.num, &display_aspect_ratio.den, + st->codecpar->width * (int64_t)sar.num, + st->codecpar->height * (int64_t)sar.den, + 1024 * 1024); + report(" Guessed SAR: %d:%d, ", sar.num, sar.den ); + report("DAR: %d:%d \n", display_aspect_ratio.num, display_aspect_ratio.den); + } + if (st->sample_aspect_ratio.num && + av_cmp_q(st->sample_aspect_ratio, st->codecpar->sample_aspect_ratio)) + { + AVRational display_aspect_ratio; + av_reduce(&display_aspect_ratio.num, &display_aspect_ratio.den, + st->codecpar->width * (int64_t)st->sample_aspect_ratio.num, + st->codecpar->height * (int64_t)st->sample_aspect_ratio.den, + 1024 * 1024); + report(" Detected SAR: %d:%d , DAR %d:%d \n", st->sample_aspect_ratio.num, st->sample_aspect_ratio.den, display_aspect_ratio.num, display_aspect_ratio.den); + } double secs = to_secs(st->duration, st->time_base); int64_t length = secs * vid->frame_rate + 0.5; double ofs = to_secs((vid->nudge - st->start_time), st->time_base); -- 2.43.0
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