[FFmpeg-devel] [PATCH] ffmpeg: Add -copystreamid

["Tomas Härdin" <git@haerdin.se>]

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Hi

Patch attached allows preserving PIDs when remuxing MPEG-TS. James
suggested we could generalize this to allow copying from specific
streams, but I think if we want to handle a more general case then it
would be better to handle streamid via metadata.

Passes FATE.

/Tomas

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From 63b10983876077fd0e2b41c21a3c188b8557c602 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tomas=20H=C3=A4rdin?= <git@haerdin.se>
Date: Thu, 11 Apr 2024 16:52:33 +0200
Subject: [PATCH] ffmpeg: Add -copystreamid

This causes streamid's to be copied from all input streams to all output streams.
Individual streams' streamid can still be set explicitly with -streamid.
---
 doc/ffmpeg.texi           | 10 ++++++++++
 fftools/ffmpeg.h          |  1 +
 fftools/ffmpeg_mux_init.c |  4 ++++
 fftools/ffmpeg_opt.c      |  5 +++++
 4 files changed, 20 insertions(+)

diff --git a/doc/ffmpeg.texi b/doc/ffmpeg.texi
index e996ab945f..ef61b7118d 100644
--- a/doc/ffmpeg.texi
+++ b/doc/ffmpeg.texi
@@ -2096,6 +2096,16 @@ an output mpegts file:
 ffmpeg -i inurl -streamid 0:33 -streamid 1:36 out.ts
 @end example
 
+@item -copystreamid
+Copy streamid's (PIDs) from input streams to output streams for all streams in all output files.
+Can be overridden with -streamid on a per-stream basis.
+
+For example, to remux an input MPEG-TS file, copying all PIDs except the PID of stream 3,
+and setting the PID of stream 3 to 0x123:
+@example
+ffmpeg -i in.ts -map 0 -c copy -copystreamid -streamid 3:0x123 -y out.ts
+@end
+
 @item -bsf[:@var{stream_specifier}] @var{bitstream_filters} (@emph{input/output,per-stream})
 Apply bitstream filters to matching streams. The filters are applied to each
 packet as it is received from the demuxer (when used as an input option) or
diff --git a/fftools/ffmpeg.h b/fftools/ffmpeg.h
index 885a7c0c10..e0f8e4d87d 100644
--- a/fftools/ffmpeg.h
+++ b/fftools/ffmpeg.h
@@ -685,6 +685,7 @@ extern int64_t stats_period;
 extern int stdin_interaction;
 extern AVIOContext *progress_avio;
 extern float max_error_rate;
+extern int copy_streamid;
 
 extern char *filter_nbthreads;
 extern int filter_complex_nbthreads;
diff --git a/fftools/ffmpeg_mux_init.c b/fftools/ffmpeg_mux_init.c
index 6d8bd5bcdf..8268595a18 100644
--- a/fftools/ffmpeg_mux_init.c
+++ b/fftools/ffmpeg_mux_init.c
@@ -1073,6 +1073,10 @@ static int ost_add(Muxer *mux, const OptionsContext *o, enum AVMediaType type,
 
     ost = &ms->ost;
 
+    if (ist && copy_streamid)
+        ost->st->id = ist->st->id;
+
+    // override -copystreamid if -streamid explicitly set
     if (o->streamid) {
         AVDictionaryEntry *e;
         char idx[16], *p;
diff --git a/fftools/ffmpeg_opt.c b/fftools/ffmpeg_opt.c
index 6526e8e3e8..5b4b29d259 100644
--- a/fftools/ffmpeg_opt.c
+++ b/fftools/ffmpeg_opt.c
@@ -77,6 +77,7 @@ int filter_complex_nbthreads = 0;
 int vstats_version = 2;
 int auto_conversion_filters = 1;
 int64_t stats_period = 500000;
+int copy_streamid     = 0;
 
 
 static int file_overwrite     = 0;
@@ -1902,5 +1903,9 @@ const OptionDef options[] = {
         "set video sync method globally; deprecated, use -fps_mode", "" },
 #endif
 
+    { "copystreamid",           OPT_TYPE_BOOL, OPT_EXPERT,
+        { &copy_streamid },
+        "copy input stream's streamid (MPEG-TS PID) to output stream, for all streams where -streamid is not set" },
+
     { NULL, },
 };
-- 
2.39.2


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