diff --git a/ffmpeg.c b/ffmpeg.c
index 956f5b6b490e55fec43997339023ca33332a2646..36e9c2b23d3b6fe8e446e413783062ffebdf50cf 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -803,7 +803,7 @@ static void do_video_out(AVFormatContext *s,
 
     format_video_sync = video_sync_method;
     if (format_video_sync == VSYNC_AUTO)
-        format_video_sync = (s->oformat->flags & AVFMT_VARIABLE_FPS) ? ((s->oformat->flags & AVFMT_NOTIMESTAMPS) ? VSYNC_PASSTHROUGH : VSYNC_VFR) : 1;
+        format_video_sync = (s->oformat->flags & AVFMT_VARIABLE_FPS) ? ((s->oformat->flags & AVFMT_NOTIMESTAMPS) ? VSYNC_PASSTHROUGH : VSYNC_VFR) : VSYNC_CFR;
 
     switch (format_video_sync) {
     case VSYNC_CFR: