[FFmpeg-devel] [PR] ffmpeg_demux: fix readrate to respect initial burst (PR #21530)

[Gyan Doshi via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>]

PR #21530 opened by Gyan Doshi (GyanD)
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21530
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21530.patch

Fixes #21510


>From eaf46cb6d4fa137f4b7633d9bf4486cb10ce94c3 Mon Sep 17 00:00:00 2001
From: Gyan Doshi <ffmpeg@gyani.pro>
Date: Tue, 20 Jan 2026 17:32:00 +0530
Subject: [PATCH] ffmpeg_demux: fix readrate to respect initial burst

Fixes #21510
---
 fftools/ffmpeg_demux.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fftools/ffmpeg_demux.c b/fftools/ffmpeg_demux.c
index 193967fce1..701f9ddc34 100644
--- a/fftools/ffmpeg_demux.c
+++ b/fftools/ffmpeg_demux.c
@@ -525,6 +525,9 @@ static void readrate_sleep(Demuxer *d)
         pts = av_rescale(ds->dts, 1000000, AV_TIME_BASE);
         now = av_gettime_relative();
         wc_elapsed = now - d->wallclock_start;
+
+        if (pts <= stream_ts_offset + initial_burst) continue;
+
         max_pts = stream_ts_offset + initial_burst + (int64_t)(wc_elapsed * d->readrate);
         lag = FFMAX(max_pts - pts, 0);
         if ( (!ds->lag && lag > 0.3 * AV_TIME_BASE) || ( lag > ds->lag + 0.3 * AV_TIME_BASE) ) {
-- 
2.52.0

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