Hi,
you just need to get the rtmp datas.Use RTMPDump + helper (optinal).Below the link for HD stream.Just check the rtmpdump topic.
Code:
rtmpdump -r "rtmp://s2.csl.delvenetworks.com/a4820/l1/" -a "a4820/l1/" -y "mp4:media/e2c1d2f469344cb1992ffcf074f4fb96/0ffacdff41ad41188a241dd95250babb/cce1adade8424e2590a02233e7380fba/alwehda_vs_alkhaleeg_crown-cup_11-9-2015.mp4" -o "alwehda_vs_alkhaleeg_crown-cup_11-9-2015_HD.mp4"
greetz