[FFmpeg-devel] [PATCH 02/13] fftools/ffmpeg: fix computing video frame duration from repeat_pict

[Anton Khirnov <anton@khirnov.net>]

This field contains the number of _field_ durations by which the
standard frame duration should be extended.
---
 fftools/ffmpeg.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/fftools/ffmpeg.c b/fftools/ffmpeg.c
index 8323c32ffd..4e45ab74b9 100644
--- a/fftools/ffmpeg.c
+++ b/fftools/ffmpeg.c
@@ -1008,10 +1008,10 @@ static int64_t video_duration_estimate(const InputStream *ist, const AVFrame *fr
         return frame->duration;
 
     if (ist->dec_ctx->framerate.den && ist->dec_ctx->framerate.num) {
-        int ticks = frame->repeat_pict >= 0 ?
-                    frame->repeat_pict + 1  :
-                    ist->dec_ctx->ticks_per_frame;
-        codec_duration = av_rescale_q(ticks, av_inv_q(ist->dec_ctx->framerate),
+        int fields = frame->repeat_pict + 2;
+        AVRational field_rate = av_mul_q(ist->dec_ctx->framerate,
+                                         (AVRational){ 2, 1 });
+        codec_duration = av_rescale_q(fields, av_inv_q(field_rate),
                                       ist->st->time_base);
     }
 
-- 
2.39.2

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