[FFmpeg-cvslog] Use Matroska document version 2 for WebM files if possible.

[Carl Eugen Hoyos]

ffmpeg | branch: release/2.1 | Carl Eugen Hoyos <cehoyos at ag.or.at> | Mon May 12 18:12:28 2014 +0200| [c5a2c26c55eb5bd0156c74bf4248c5123e97b30f] | committer: Carl Eugen Hoyos

Use Matroska document version 2 for WebM files if possible.

Google's plugin for the Internet Explorer refuses to play
files with another document version.

Fixes ticket #3583.
(cherry picked from commit ab21acecc72a0299895583cf83347ab5e2444b71)

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=c5a2c26c55eb5bd0156c74bf4248c5123e97b30f
---

 libavformat/matroskaenc.c |   16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index 1a23151..8bc13f1 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -1057,7 +1057,7 @@ static int mkv_write_header(AVFormatContext *s)
     AVIOContext *pb = s->pb;
     ebml_master ebml_header, segment_info;
     AVDictionaryEntry *tag;
-    int ret, i;
+    int ret, i, version = 2;
 
     if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;
     else                                   mkv->mode = MODE_MATROSKAv2;
@@ -1065,7 +1065,12 @@ static int mkv_write_header(AVFormatContext *s)
     if (s->avoid_negative_ts < 0)
         s->avoid_negative_ts = 1;
 
-    for (i = 0; i < s->nb_streams; i++)
+    if (mkv->mode != MODE_WEBM ||
+        av_dict_get(s->metadata, "stereo_mode", NULL, 0) ||
+        av_dict_get(s->metadata, "alpha_mode", NULL, 0))
+        version = 4;
+
+    for (i = 0; i < s->nb_streams; i++) {
         if (s->streams[i]->codec->codec_id == AV_CODEC_ID_ATRAC3 ||
             s->streams[i]->codec->codec_id == AV_CODEC_ID_COOK ||
             s->streams[i]->codec->codec_id == AV_CODEC_ID_RA_288 ||
@@ -1077,6 +1082,11 @@ static int mkv_write_header(AVFormatContext *s)
                    avcodec_get_name(s->streams[i]->codec->codec_id));
             return AVERROR_PATCHWELCOME;
         }
+        if (s->streams[i]->codec->codec_id == AV_CODEC_ID_OPUS ||
+            av_dict_get(s->streams[i]->metadata, "stereo_mode", NULL, 0) ||
+            av_dict_get(s->streams[i]->metadata, "alpha_mode", NULL, 0))
+            version = 4;
+    }
 
     mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));
     if (!mkv->tracks)
@@ -1088,7 +1098,7 @@ static int mkv_write_header(AVFormatContext *s)
     put_ebml_uint   (pb, EBML_ID_EBMLMAXIDLENGTH    ,           4);
     put_ebml_uint   (pb, EBML_ID_EBMLMAXSIZELENGTH  ,           8);
     put_ebml_string (pb, EBML_ID_DOCTYPE            , s->oformat->name);
-    put_ebml_uint   (pb, EBML_ID_DOCTYPEVERSION     ,           4);
+    put_ebml_uint   (pb, EBML_ID_DOCTYPEVERSION     ,     version);
     put_ebml_uint   (pb, EBML_ID_DOCTYPEREADVERSION ,           2);
     end_ebml_master(pb, ebml_header);