The Mini Converter SDI to Analog from Blackmagic will accept an SDI input signal and convert it to HD/SD component, NTSC, PAL, or S-video output. Also, if your SDI signal has audio embedded, the Converter will let you first de-embed the audio so that you can output it via the analog outs.

SDI to Analog Conversion
Use this device to convert SDI video signals to analog output.
Embedded Audio
The Converter can de-embed audio from an SDI signal so that you can output it via the analog outs.