Serial data transport interface
SDTI stands for Serial Data Transport Interface , a specific form of data interface . The SDTI standard according to the SMPTE 305M standard describes the transmission of compressed digital video data using an SDI data stream. An existing SDI infrastructure can be used.
background
Digital video data requires a lot of storage space, which is why video compression is used for storage in most cases . If digital video stored in compressed form is transmitted using SDI , it must first be decompressed at the source (player) ( SDI transmits uncompressed) and then compressed again for storage at the sink (recorder). This combination of decompression and recompression leads to a loss of quality in the case of lossy data compression .
SDTI avoids this recompression, since the digital video data is transmitted in the original compression (native). This means that the transfer process is lossless. Due to the existing compression of the video data, a faster transfer is possible with SDTI than in real time as with SDI. The possible factor for the faster transmission results from the existing SDI bit rate and the bit rate of the transmitted compressed digital video signal.
SDTI was created to standardize the various proprietary interfaces of the system manufacturers for native compressed video transmission. Transmission with SDTI is only possible between two components that use the same compression (codec).
Similar techniques
When transferring digital video (e.g.) from a DV camcorder to a computer via FireWire , compressed digital video data is transferred as with SDTI.
SDTI-CP (Serial Data Transport Interface - Contents Package) is used by certain manufacturers to transmit I-frame-based MPEG-2 digital video streams.