File Generator, File Parser, Methods and Video Bitstream with Improved Access Unit Delimiter, End of Sequence, End of Bitstream and Further Non-Video Coding Layer Network Access Layer Units

A file parser for generating an output video bitstream from a file according to an embodiment is provided. The file parser is configured to receive the file being an input video bitstream, wherein the input video bitstream has a video encoded therein. The input video bitstream has a sample group, the sample group having a network abstraction layer unit; and/or the input video bitstream has an indication that an access unit of a plurality of access units of the input video bitstream or a sample of a plurality of samples of the input video bitstream, which does not have the network abstraction layer unit, should have the network abstraction layer unit. The file parser is configured to generate the output video bitstream from the input video bitstream depending on the sample group.