HDCAM-SR
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HDCAM SR, introduced in 2003, uses a higher particle density tape and is capable of recording in 10 bits 4:4:4 RGB with a bitrate of 440 Mbit/s. The increased bitrate (over HDCAM) allows HDCAM SR to capture much more of the full bandwidth of the HDSDI signal (1920x1080). Some HDCAM SR VTRs can also use a 2x mode with an even higher bitrate of 880 Mbit/s, allowing for a single 4:4:4 stream at a lower compression or two 4:2:2 video streams simultaneously. HDCAM SR uses the new MPEG-4 Studio Profile for compression, and expands the number of audio channels up to 12.
Some HDCAM VTRs play back older Betacam variants, for example, the SRW-5500 from Sony, an HDCAM SR recorder, plays back Digital Betacam, HDCAM and HDCAM SR tapes, and tape lengths are the same as for Digital Betacam, up to 40 minutes for S and 124 minutes for L tapes. In 24p mode the runtime increases to 50 and 155 minutes, respectively.
HDCAM tapes are black with an orange lid, and HDCAM SR tapes black with a cyan lid.
440 Mbit/s mode is known as SQ, and 880 Mbit/s mode is known as HQ, and this mode has recently become available in stationary models as well as portable models previously avalilable.
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