Extracting Two Bam Files And Indexing Them To Compare Indels

I need to fetch 2 BAM files from an HTTP server and I only need 'chr1' so I'm attempting to use:

samtools view -h http://cdna.eva.mpg.de/denisova/alignments/T_hg19_1000g.bam chr1 chr1.bam

for each file but I'm getting an error:

[knetseek] SEEKEND is not supported for HTTP. Offset is unchanged.

This is also inhibiting me from indexing the files.

In the end these 2 chromosomes will be used to compare indels/SNPs using IGV or whichever program we choose at that time. If anyone has some tips or shortcuts for a beginner I'd truly appreciate it.

Edit: Not FTP. It's a HTTP server