pick_format      1052 libavfilter/avfiltergraph.c                         if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
pick_format      1061 libavfilter/avfiltergraph.c                         if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
pick_format      1070 libavfilter/avfiltergraph.c                         if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
pick_format      1083 libavfilter/avfiltergraph.c             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
pick_format      1086 libavfilter/avfiltergraph.c             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)