Index: libmpcodecs/vd_ffmpeg.c =================================================================== --- libmpcodecs/vd_ffmpeg.c (Revision 29857) +++ libmpcodecs/vd_ffmpeg.c (Arbeitskopie) @@ -118,7 +118,10 @@ // to set/get/query special features/parameters static int control(sh_video_t *sh, int cmd, void *arg, ...){ vd_ffmpeg_ctx *ctx = sh->context; - AVCodecContext *avctx = ctx->avctx; + AVCodecContext *avctx; + + if (!ctx) return CONTROL_UNKNOWN; + avctx = ctx->avctx; switch(cmd){ case VDCTRL_QUERY_FORMAT: {