There's no way for the encoder to know whether the input is CFR, so
assume VFR.
---
 libavcodec/libx264.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/libavcodec/libx264.c b/libavcodec/libx264.c
index adda881..72fd390 100644
--- a/libavcodec/libx264.c
+++ b/libavcodec/libx264.c
@@ -381,8 +381,9 @@ static av_cold int X264_init(AVCodecContext *avctx)
     x4->params.i_height         = avctx->height;
     x4->params.vui.i_sar_width  = avctx->sample_aspect_ratio.num;
     x4->params.vui.i_sar_height = avctx->sample_aspect_ratio.den;
-    x4->params.i_fps_num = x4->params.i_timebase_den = avctx->time_base.den;
-    x4->params.i_fps_den = x4->params.i_timebase_num = avctx->time_base.num;
+    x4->params.i_timebase_den = avctx->time_base.den;
+    x4->params.i_timebase_num = avctx->time_base.num;
+    x4->params.b_vfr_input    = 1;
 
     x4->params.analyse.b_psnr = avctx->flags & CODEC_FLAG_PSNR;
 
-- 
1.7.10.4

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