avisynth_next_stream  807 libavformat/avisynth.c     avisynth_next_stream(s, &st, pkt, &discard);
avisynth_next_stream  811 libavformat/avisynth.c             avisynth_next_stream(s, &st, pkt, &discard);
avisynth_next_stream  817 libavformat/avisynth.c             avisynth_next_stream(s, &st, pkt, &discard);