matroska: Write the correct DocTypeVersion when using frame-packing

The StereoMode element is only valid with DocTypeVersion 3 or higher.

diff --git a/output/matroska_ebml.c b/output/matroska_ebml.c
index db2c35f701a33f97a8e9530890f5978860d003bc..864c1af3bd14b3c32d348837efa3f4c7ac1e1768 100644 (file)
--- a/output/matroska_ebml.c
+++ b/output/matroska_ebml.c
@@ -340,7 +340,7 @@ int mk_write_header( mk_writer *w, const char *writing_app,
     CHECK( mk_write_uint( c, 0x42f2, 4 ) ); // EBMLMaxIDLength
     CHECK( mk_write_uint( c, 0x42f3, 8 ) ); // EBMLMaxSizeLength
     CHECK( mk_write_string( c, 0x4282, "matroska") ); // DocType
-    CHECK( mk_write_uint( c, 0x4287, 2 ) ); // DocTypeVersion
+    CHECK( mk_write_uint( c, 0x4287, stereo_mode >= 0 ? 3 : 2 ) ); // DocTypeVersion
     CHECK( mk_write_uint( c, 0x4285, 2 ) ); // DocTypeReadversion
     CHECK( mk_close_context( c, 0 ) );