Sita Sings the Blues is 2008 independent animated feature by Nina Paley. The dvd sound is stereo and near as I can find the only surround sound version is in 35mm. The best bluray compatible download at present is 1080x1440p mpeg2.
Fortunately, the film’s creator has generously made the working materials needed available for anyone to work with. This version will feature a fresh encode at 1080x1920 h264 from a 210 gigabyte master and both stereo and surround mixes.

Anyone interested? If so I’ll upload it.