| diff --git a/libmpcodecs/vd_ffmpeg.c b/libmpcodecs/vd_ffmpeg.c |
| index 7c68a20..135e6b1 100644 |
| --- a/libmpcodecs/vd_ffmpeg.c |
| +++ b/libmpcodecs/vd_ffmpeg.c |
| @@ -280,7 +280,7 @@ static int init(sh_video_t *sh){ |
| return 0; |
| } |
| |
| - if(vd_use_slices && (lavc_codec->capabilities&CODEC_CAP_DRAW_HORIZ_BAND) && !do_vis_debug) |
| + if(vd_use_slices && (lavc_codec->capabilities&CODEC_CAP_DRAW_HORIZ_BAND) && !do_vis_debug && lavc_param_threads <= 1) |
| ctx->do_slices=1; |
| |
| if(lavc_codec->capabilities&CODEC_CAP_DR1 && !do_vis_debug && lavc_codec->id != CODEC_ID_H264 && lavc_codec->id != CODEC_ID_INTERPLAY_VIDEO && lavc_codec->id != CODEC_ID_ROQ && lavc_codec->id != CODEC_ID_VP8 && lavc_codec->id != CODEC_ID_LAGARITH) |
