An apparatus obtains an operation point reference track in the file and one or more additional tracks in the file. No operation point information sample group is signaled in any of the additional tracks. For each respective sample of each respective additional track of the one or more additional tracks, the apparatus determines whether to consider the respective sample part of the operation point information sample group. Based on the operation point reference track not containing a sample that is temporally collocated with the respective sample in the respective additional track, the respective sample in the respective additional track is considered part of an operation point information sample group of the last sample in the operation point reference track before the respective sample of the respective additional track.