[FFmpeg-devel] [PR] avformat/rtp_mpegts: Pass-through program table to mpegts muxer (PR #21801)

[Rost Kurylo via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>]

PR #21801 opened by Rost Kurylo (rost.kurylo)
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21801
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21801.patch

Previously only the stream list has been passed through to mpegts
muxer, and the program layout, if any has been provided, was lost.
This change copies the program table into the nested mepgts muxer
when initializing rtp_mpegts.

To test:

```
ffmpeg -re -stream_loop -1 -i <any_file_with_at_least_one_video_and_one_audio> -c:v copy -c:a copy -map 0:v:0 -map 0:a:0 -map 0:v:0 -map 0:a:0 -program title=Prog1:program_num=101:st=0:st=1 -program title=Prog2:program_num=102:st=2:st=3 -f rtp_mpegts 'rtp://127.0.0.1:5004'
```

Then probe with:

```
ffprobe rtp://127.0.0.1:5004 -show_programs -print_format json
```

Signed-off-by: Rost Kurylo <rost.kurylo@netint.ca>


>From 168d22b0b1e367c55381cb98c3cb0dfb4fef0b1f Mon Sep 17 00:00:00 2001
From: Rost Kurylo <rost.kurylo@netint.ca>
Date: Thu, 19 Feb 2026 10:05:10 -0800
Subject: [PATCH] avformat/rtp_mpegts: Pass-through program table to mpegts
 muxer

Previously only the stream list has been passed through to mpegts
muxer, and the program layout, if any has been provided, was lost.
This change copies the program table into the nested mepgts muxer
when initializing rtp_mpegts.

Signed-off-by: Rost Kurylo <rost.kurylo@netint.ca>
---
 libavformat/rtpenc_mpegts.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/libavformat/rtpenc_mpegts.c b/libavformat/rtpenc_mpegts.c
index f9ff7e99cd..e7661ce880 100644
--- a/libavformat/rtpenc_mpegts.c
+++ b/libavformat/rtpenc_mpegts.c
@@ -85,6 +85,29 @@ static int rtp_mpegts_write_header(AVFormatContext *s)
         st->id                  = s->streams[i]->id;
         avcodec_parameters_copy(st->codecpar, s->streams[i]->codecpar);
     }
+    for (i = 0; i < s->nb_programs; i++) {
+        AVProgram* program = av_new_program(mpegts_ctx, s->programs[i]->id);
+        if (!program)
+            goto fail;
+        program->id = s->programs[i]->id;
+        program->flags = s->programs[i]->flags;
+        program->discard = s->programs[i]->discard;
+        program->nb_stream_indexes = s->programs[i]->nb_stream_indexes;
+        program->stream_index = av_realloc_array(program->stream_index, program->nb_stream_indexes, sizeof(unsigned int));
+        if (!program->stream_index)
+            goto fail;
+        memcpy(program->stream_index, s->programs[i]->stream_index, program->nb_stream_indexes * sizeof(unsigned int));
+        av_dict_copy(&program->metadata, s->programs[i]->metadata, 0);
+
+        program->program_num = s->programs[i]->program_num;
+        program->pmt_pid = s->programs[i]->pmt_pid;
+        program->pcr_pid = s->programs[i]->pcr_pid;
+        program->pmt_version = s->programs[i]->pmt_version;
+        program->start_time = s->programs[i]->start_time;
+        program->end_time   = s->programs[i]->end_time;
+        program->pts_wrap_reference = s->programs[i]->pts_wrap_reference;
+        program->pts_wrap_behavior = s->programs[i]->pts_wrap_behavior;
+    }
     if ((ret = avio_open_dyn_buf(&mpegts_ctx->pb)) < 0)
         goto fail;
 
-- 
2.52.0

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