[vlc-devel] [PATCH] vpx: decoder: Set i_sar_num and i_sar_den

Andrew Clayton andrew at digital-domain.net
Mon Jan 23 02:56:17 CET 2017

Since commit 0bceaf96 ("vpx: increase decoder capability (refs #16836)")
made libvpx the default this has broken the default playback of VP8/9
video where the sample aspect ratio (SAR) is not equal to one. e.g

Given a video like

    vp8, yuv420p, 720x576, SAR 64:45 DAR 16:9, 25 fps

which is meant to be played back at 1024x576, will playback at 720x576
due to not passing the SAR value through.

I have many such videos as encoded from PAL DVD's. Another example is

    vp8, yuv420p, 720x576, SAR 16:15 DAR 4:3, 25 fps

this should actually playback at 768x576.

So this commit simply passes the SAR values through. Without this
passing --codec=ffmpeg or --codec=avcodec also restores previous

Signed-off-by: Andrew Clayton <andrew at digital-domain.net>
 modules/codec/vpx.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/modules/codec/vpx.c b/modules/codec/vpx.c
index fa494d8..db53164 100644
--- a/modules/codec/vpx.c
+++ b/modules/codec/vpx.c
@@ -325,6 +325,8 @@ static int OpenDecoder(vlc_object_t *p_this)
     dec->pf_decode_video = Decode;
     dec->fmt_out.i_cat = VIDEO_ES;
+    dec->fmt_out.video.i_sar_num = dec->fmt_in.video.i_sar_num;
+    dec->fmt_out.video.i_sar_den = dec->fmt_in.video.i_sar_den;
     dec->fmt_out.video.i_width = dec->fmt_in.video.i_width;
     dec->fmt_out.video.i_height = dec->fmt_in.video.i_height;

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