transcode: Fixed pkt timestamps

transcode.c

@@ -187,7 +187,7 @@ static void flush_encoder(AVFormatContext *mux, AVFilterContext *sink, AVCodecCo
 	while (!avcodec_receive_packet(enc, &pkt))
 	{
 		pkt.stream_index = idx;
-		av_packet_rescale_ts(&pkt, sink->inputs[0]->time_base,
+		av_packet_rescale_ts(&pkt, enc->time_base,
 				mux->streams[idx]->time_base);
 		if (err = av_interleaved_write_frame(mux, &pkt))
 			job_failed("Could not write frame: %s", av_err2str(err));