Je was op zoek naar: iosrenditions (Spaans - Engels)

recuerde que al solicitar iosrenditions la única opción de salida es json.
note that when you request iosrenditions, the only output option is json.

para devolver variantes de representación mp4, deberá incluir renditions en el argumento video_fields, y iosrenditions para devolver variantes de representación m2ts.
to return the mp4 renditions, you need to include renditions in the video_fields argument, and iosrenditions to return the m2ts renditions.