SAN FRANCISCO — The producers behind the YouTube channel “ZombieGoBoom” are suing Google Inc. claiming that recent changes in the way ads are placed on streaming videos have unfairly affected them and others who rely on YouTube ad revenues for income.

Google made adjustments to address advertiser concerns in March after The Wall Street Journal reported that YouTube was placing ads on objectionable content such as videos supporting neo-Nazi causes and ISIS. The changes have been dubbed the “Adpocalypse” by some YouTube content producers. James Sweet and Chuck Mere, the Fayetteville, Arkansas-based filmmakers behind the ZombieGoBoom channel, claim in a federal lawsuit filed Thursday that the changes caused their monthly YouTube-based income to plummet. Their series, which they describe as “a live action zombie series that is essentially a combination of ‘Mythbusters’ and ‘The Walking Dead,’” has seen ad revenues drop from about $300 to $500 per day to $20 to $40 per day since March 27, according to the complaint.