[FFmpeg-devel] [PR] fftools/ffmpeg_demux: Fix -readrate_initial_burst implementation where lag/catchup detection was kicking in, overriding the burst. (PR #21512)

[ddurham2 via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>]

PR #21512 opened by ddurham2
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21512
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21512.patch

addresses issue #21510


>From 5818330487fee2e36481dbda71b918c5e9928899 Mon Sep 17 00:00:00 2001
From: Davy Durham <ddurham@users.sourceforge.net>
Date: Sun, 18 Jan 2026 00:32:21 -0600
Subject: [PATCH] fftools/ffmpeg_demux: Fix -readrate_initial_burst
 implementation where lag/catchup detection was kicking in, overriding the
 burst.

---
 fftools/ffmpeg_demux.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fftools/ffmpeg_demux.c b/fftools/ffmpeg_demux.c
index 193967fce1..1fc1554a60 100644
--- a/fftools/ffmpeg_demux.c
+++ b/fftools/ffmpeg_demux.c
@@ -100,7 +100,7 @@ typedef struct DemuxStream {
     int64_t                  resume_wc;
     // timestamp of first packet sent after the latest stall - used for readrate
     int64_t                  resume_pts;
-    // measure of how far behind packet reading is against spceified readrate
+    // measure of how far behind packet reading is against specified readrate
     int64_t                  lag;
 } DemuxStream;
 
@@ -521,6 +521,10 @@ static void readrate_sleep(Demuxer *d)
 
         if (ds->discard) continue;
 
+        if (ds->lag == 0 && initial_burst > 0) {
+            ds->lag = initial_burst;
+        }
+
         stream_ts_offset = FFMAX(ds->first_dts != AV_NOPTS_VALUE ? ds->first_dts : 0, file_start);
         pts = av_rescale(ds->dts, 1000000, AV_TIME_BASE);
         now = av_gettime_relative();
-- 
2.52.0

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