Method and device for generating/receiving media file including nal unit information, and method for transmitting media file

A media file receiving apparatus comprising a memory and at least one processor, the at least one processor configured to:

• obtain network abstraction layer (NAL) unit information of video data from a decoder configuration record in a media file, and
• process the video data based on the NAL unit information,
• wherein the NAL unit information comprises first information specifying a number of NAL units having a NAL unit type indicated in the decoder configuration record, for a stream to which the decoder configuration record is applied, and
• wherein, based on the indicated NAL unit type being a predetermined non-video coding layer (non-VCL) NAL unit type, obtaining of the first information is skipped.

A media file generating method performed by an apparatus for generating a media file of a predetermined format, the media file including video data, the media file generating method comprising:

• encoding video data;
• generating a decoder configuration record including network abstraction layer (NAL) unit information of the encoded video data;
• and
• generating a media file based on the encoded video data and the decoder configuration record,
• wherein the NAL unit information comprises first information specifying a number of NAL units having a NAL unit type indicated in the decoder configuration record, for a stream to which the decoder configuration record is applied, and
• wherein, based on the indicated NAL unit type being a predetermined non-video coding layer (non-VCL) NAL unit type, the first information is not included in the decoder configuration record and a value of the first information is set to 1.

A media file generating apparatus comprising a memory and at least one processor, the at least one processor configured to:

• encode video data;
• generate a decoder configuration record including network abstraction layer (NAL) unit information of the encoded video data;
• and
• generate a media file based on the encoded video data and the decoder configuration record,
• wherein the NAL unit information comprises first information specifying a number of NAL units having a NAL unit type indicated in the decoder configuration record, for a stream to which the decoder configuration record is applied, and
• wherein, based on the indicated NAL unit type being a predetermined non-video coding layer (non-VCL) NAL unit type, the first information is not included in the decoder configuration record and a value of the first information is set to 1.