[FFmpeg-devel] [PATCH] avformat/mpegts: fix the issue where the PMT table can't be retrieved. (PR #21166)

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

PR #21166 opened by ganqiuye
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21166
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21166.patch

When analysing PAT, if sid 0 and pmt_pid 0 (current_pid 0 as pat_pid),
it will break out of the loop, so it can't retrieve the next pmt_pid.

Signed-off-by: ganqiuye <ganqiuye@gmail.com>


>From 6b03124bb57ef4afc118ff2123d15d54402b4302 Mon Sep 17 00:00:00 2001
From: ganqiuye <ganqiuye@gmail.com>
Date: Thu, 11 Dec 2025 14:32:01 +0800
Subject: [PATCH] avformat/mpegts: fix the issue where the PMT table can't be
 retrieved.

When analysing PAT, if sid 0 and pmt_pid 0 (current_pid 0 as pat_pid),
it will break out of the loop, so it can't retrieve the next pmt_pid.

Signed-off-by: ganqiuye <ganqiuye@gmail.com>
---
 libavformat/mpegts.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/libavformat/mpegts.c b/libavformat/mpegts.c
index 33f2914104..f6d860007f 100644
--- a/libavformat/mpegts.c
+++ b/libavformat/mpegts.c
@@ -2590,14 +2590,13 @@ static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len
             break;
         pmt_pid &= 0x1fff;
 
-        if (pmt_pid == ts->current_pid)
-            break;
-
         av_log(ts->stream, AV_LOG_TRACE, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
 
         if (sid == 0x0000) {
             /* NIT info */
         } else {
+            if (pmt_pid == ts->current_pid)
+                break;
             MpegTSFilter *fil = ts->pids[pmt_pid];
             struct Program *prg;
             program = av_new_program(ts->stream, sid);
-- 
2.49.1

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