static void output_packet(AVFormatContext *s, AVPacket *pkt, OutputStream *ost) { int ret = 0; /* apply the output bitstream filters, if any */ if (ost->nb_bitstream_filters) { int idx; ret = av_bsf_send_packet(ost->bsf_ctx[0], pkt); if (ret < 0) goto finish; idx = 1; while (idx) { /* get a packet from the previous filter up the chain */ ret = av_bsf_receive_packet(ost->bsf_ctx[idx - 1], pkt); if (ret == AVERROR(EAGAIN)) { ret = 0; idx--; continue; } else if (ret < 0) goto finish; /* send it to the next filter down the chain or to the muxer */ if (idx < ost->nb_bitstream_filters) { ret = av_bsf_send_packet(ost->bsf_ctx[idx], pkt); if (ret < 0) goto finish; idx++; } else write_packet(s, pkt, ost); } } else write_packet(s, pkt, ost); finish: if (ret < 0 && ret != AVERROR_EOF) { av_log(NULL, AV_LOG_FATAL, "Error applying bitstream filters to an output " "packet for stream #%d:%d.\n", ost->file_index, ost->index); exit_program(1); } }