pick_format      1118 libavfilter/avfiltergraph.c                         if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
pick_format      1127 libavfilter/avfiltergraph.c                         if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
pick_format      1136 libavfilter/avfiltergraph.c                         if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
pick_format      1149 libavfilter/avfiltergraph.c             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
pick_format      1152 libavfilter/avfiltergraph.c             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)