VP80 fourcc are writed for all contexts (without ctx->codec_tag)
how to reproduce the issue:
1) Get any vp9 video (for example http://base-n.de/webm/out9.webm)
2) ffmpeg -i out9.webm -vcodec copy out9.ivf
3) out9.ivf have VP80 fourcc at ivf header
The proposed fix solves this issue
---
libavformat/ivfenc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavformat/ivfenc.c b/libavformat/ivfenc.c
index 5700f01..1d76c5c 100644
--- a/libavformat/ivfenc.c
+++ b/libavformat/ivfenc.c
@@ -38,7 +38,7 @@ static int ivf_write_header(AVFormatContext *s)
avio_write(pb, "DKIF", 4);
avio_wl16(pb, 0); // version
avio_wl16(pb, 32); // header length
- avio_wl32(pb, ctx->codec_tag ? ctx->codec_tag : AV_RL32("VP80"));
+ avio_wl32(pb, ctx->codec_tag ? ctx->codec_tag : ctx->codec_id ==
AV_CODEC_ID_VP9 ? AV_RL32("VP90") : AV_RL32("VP80"));
avio_wl16(pb, ctx->width);
avio_wl16(pb, ctx->height);
avio_wl32(pb, s->streams[0]->time_base.den);
--
1.9.1
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