From ac9c2c71e814c582058be2067bdd349ec4e16acb Mon Sep 17 00:00:00 2001
From: Moritz Bunkus <moritz@bunkus.org>
Date: Sun, 3 Oct 2004 18:10:57 +0000
Subject: [PATCH] Merged 2279

---
 src/mkvmerge.cpp   | 5 +++--
 src/pr_generic.cpp | 7 +++++++
 src/pr_generic.h   | 2 ++
 3 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/src/mkvmerge.cpp b/src/mkvmerge.cpp
index fd6d5ef3d..253a60e37 100644
--- a/src/mkvmerge.cpp
+++ b/src/mkvmerge.cpp
@@ -1694,9 +1694,10 @@ create_readers() {
   }
 
   if (!identifying) {
-    for (i = 0; i < files.size(); i++) {
+    for (i = 0; i < files.size(); i++)
       files[i]->reader->create_packetizers();
-    }
+    for (i = 0; i < files.size(); i++)
+      files[i]->reader->check_track_ids_and_packetizers();
   }
 }
 
diff --git a/src/pr_generic.cpp b/src/pr_generic.cpp
index a96bee772..b6e9dccbe 100644
--- a/src/pr_generic.cpp
+++ b/src/pr_generic.cpp
@@ -1314,6 +1314,13 @@ generic_reader_c::display_progress(bool) {
     act_wchar = 0;
 }
 
+void
+generic_reader_c::check_track_ids_and_packetizers() {
+  if (reader_packetizers.size() == 0)
+    mxwarn(FMT_FN "No tracks will be copied from this file. This usually "
+           "indicates a mistake in the command line.\n", ti->fname);
+}
+
 //
 //--------------------------------------------------------------------
 
diff --git a/src/pr_generic.h b/src/pr_generic.h
index 2b56d9207..87ae13649 100644
--- a/src/pr_generic.h
+++ b/src/pr_generic.h
@@ -286,6 +286,8 @@ public:
   virtual int add_packetizer(generic_packetizer_c *ptzr);
   virtual void set_timecode_offset(int64_t offset);
 
+  virtual void check_track_ids_and_packetizers();
+
 protected:
   virtual bool demuxing_requested(char type, int64_t id);
 };