//rescalling before encoding packet and feed to filter
				av_packet_rescale_ts(&packet,
									ifmt_ctx->streams[stream_index]->time_base,
									dec_ctx->time_base);


//rescalling before av_interleaved_write_frame
		av_packet_rescale_ts(&enc_pkt,
							enc_ctx->time_base,
							ofmt_ctx->streams[enc_pkt.stream_index]->time_base);