Get Report @ br br Digital pre-roll and in-stream video inventory is expanding at a 20.3 rate in 2013, while corresponding media spend is expected to increase 37.8 over the calendar year, as presented in an avails analytics report by AccuStream Research. br br The report, Digital Pre-Roll and In-Stream Video Avails: 2013 – 2016, attributes increased video spend to higher sellout rates sector-wide–even as insertion frequencies rise–to marketers who are buying scale, including campaigns against YouTube’s expansive library and inside social networking environments strengthened by greater inventory transparency.