From: Tudor Suciu <[email protected]>

---
 libavformat/matroskaenc.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index cc645a5..74c1925 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -607,10 +607,14 @@ static int mkv_write_tracks(AVFormatContext *s)
             }
         }
 
-        if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
-                                        codec->codec_id == 
AV_CODEC_ID_VORBIS)) {
+        if (mkv->mode == MODE_WEBM &&
+            !(codec->codec_id == AV_CODEC_ID_VP8 ||
+              codec->codec_id == AV_CODEC_ID_VP9 ||
+              codec->codec_id == AV_CODEC_ID_VORBIS ||
+              (codec->codec_id == AV_CODEC_ID_OPUS &&
+               codec->strict_std_compliance <= FF_COMPLIANCE_EXPERIMENTAL))) {
             av_log(s, AV_LOG_ERROR,
-                   "Only VP8 video and Vorbis audio are supported for 
WebM.\n");
+                   "Only VP8 or VP9 video and Vorbis or Opus (experimental, 
use -strict -2) audio are supported for WebM.\n");
             return AVERROR(EINVAL);
         }
 
-- 
1.8.3.2

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