Does anyone know of programmatic software which can reliably transcode 4k video (prores422, prores444, redcode, photojpeg) to similar or downscaled resolutions

Does anyone know of programmatic software which can reliably transcode 4k video (prores422, prores444, redcode, photojpeg) to similar or downscaled resolutions of photojpeg or other widely used intra-frame intermediary codecs? It seems to me like everything out there is targeted to encode to highly compressed super lossy formats like h264 for consumer playback. Would like to run a service which can transcode output to photojpeg.