[BC] Need audio delay buffer

[robertm]

Measure delay the same way it's been done for nearly 100 years.....a clap board. Feed some moving video through the system a periodically key in the clapboard. Be sure to record a full hour. 

The specs on your BME says it takes 59.9494 in numerous formats which includes 1080i. You may have another conversion problem. Back in the late 90s we setup the first HD mobile unit for NFL football. By today's standards it was a pretty primitive setup. The basic system was Sony but graphics were from an SGI Onyx that could only output YUV analog which we fed to a converter that output SDI. We spent hours unsuccessfully trying to get it to lock. Eventually we found that Sony used 1035 active lines, not 1080. Once we made adjustments, everything worked. You can't assume anything once external converters are in play.  


> On Jul 10, 2014, at 4:03 PM, James Potter <jpotter at jpotter.com> wrote:
> 
> Just how do you go about measuring that delay?  I don't have any HD video test equipment, but I do have pretty good eyes and ears.  I plan to put a camera on some guy in the pew singing a song over and over again, and adjusting the audio delay until the sound matches his lips on the BME screen display.  Don't see any reason to quantify the delay.  We're interlaced and 59.9494 Hz. (actually 60 is what BME prefers -- won't make a picture at 59.9494.)