VSYNC_VSCFR       934 ffmpeg.c                   format_video_sync = VSYNC_VSCFR;
VSYNC_VSCFR       937 ffmpeg.c                   format_video_sync = VSYNC_VSCFR;
VSYNC_VSCFR       956 ffmpeg.c           case VSYNC_VSCFR:
VSYNC_VSCFR      2872 ffmpeg.c                          && (video_sync_method == VSYNC_CFR || video_sync_method == VSYNC_VSCFR || (video_sync_method == VSYNC_AUTO && !(oc->oformat->flags & AVFMT_VARIABLE_FPS)))){