Media encapsulating and decapsulating

Patent metadata

Field	Value
Publication number	US-9820015-B2
Application number	US-201414583332-A
Country	US
Kind code	B2
Filing date	Dec 26, 2014
Priority date	Jan 7, 2014
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

There are disclosed various methods, apparatuses and computer program products for media encapsulating and decapsulating. A container file according to a first format is obtained or generated including or referring to at least two media data units and to an obtained or generated metadata item according to a second format, the metadata item being valid for one or more media data units; and scope information is included in the container file indicating said one or more of said at least two media data units. There is also disclosed a method comprising receiving the container file; receiving the metadata item; and parsing from the container file the scope information; selecting one or more of said at least two media data units on the basis of the scope information; and determining the validity of the metadata item for said one or more of said at least two media data units.

First claim

The invention claimed is:

1. A method comprising:
receiving a container file according to a first format, the container file including or referring to at least two media data units;
receiving a metadata item according to a second format different from the first format, the metadata item being valid for one or more of said at least two media data units, the container file including or referring to the metadata item;
parsing from the container file scope information indicating said one or more of said at least two media data units, wherein the scope information additionally comprises types of information on said one or more of said at least two media data units;
parsing from the container file a first checksum;
selecting one or more of said at least two media data units on the basis of the scope information;
deriving a second checksum on the basis of the types of information on said one or more of said at least two media data units;
comparing the first checksum and the second checksum; and
determining at least one of the following:
when the first checksum is equal to the second checksum, determining that the metadata item is valid for said one or more of said at least two media data units; or
when the first checksum is not equal to the second checksum, determining that the metadata item is not valid for said one or more of said at least two media data units.

2. The method according to claim 1 further comprising:
removing the metadata item, the first checksum and the scope information from the file, when the first checksum is not equal to the second checksum.

3. An apparatus comprising at least one processor and at least one memory, said at least one memory stored with code thereon, which when executed by said at least one processor, causes an apparatus to:
receive a container file according to a first format, the container file including or referring to at least two media data units;
receive a metadata item according to a second format different from the first format, the metadata item being valid for one or more of said at least two media data units, the container file including or referring to the metadata item;
parse from the container file scope information indicating said one or more of said at least two media data units, wherein the scope information additionally comprises types of information on said one or more of said at least two media data units;
parse from the container file a first checksum;
select one or more of said at least two media data units on the basis of the scope information;
derive a second checksum on the basis of the types of information on said one or more of said at least two media data units;
compare the first checksum and the second checksum; and
determine at least one of the following:
when the first checksum is equal to the second checksum, determine that the metadata item is valid for said one or more of said at least two media data unit; or
when the first checksum is not equal to the second checksum, determine that the metadata item is not valid for said one or more of said at least two media data units.

4. The apparatus according to claim 3 , said at least one memory stored with code thereon, which when executed by said at least one processor, causes the apparatus to:
remove the metadata item, the first checksum and the scope information from the file, when the first checksum is not equal to the second checksum.

5. A computer program product embodied on a non-transitory computer readable medium, comprising computer program code configured to, when executed on at least one processor, cause an apparatus or a system to:
receive a container file according to a first format, the container file including or referring to at least two media data units;
receive a metadata item according to a second format different from the first format, the metadata item being valid for one or more of said at least two media data units, the container file including or referring to the metadata item;
parse from the container file scope information indicating said one or more of said at least two media data units, wherein the scope information additionally comprises types of information on said one or more of said at least two media data units;
parse from the container file a first checksum;
select one or more of said at least two media data units on the basis of the scope information;
derive a second checksum on the basis of the types of information on said one or more of said at least two media data units;
compare the first checksum and the second checksum; and
determine at least one of the following:
when the first checksum is equal to the second checksum, determining that the metadata item is valid for said one or more of said at least two media data units; or
when the first checksum is not equal to the second checksum, determining that the metadata item is not valid for said one or more of said at least two media data units.

6. A method comprising:
obtaining or generating a container file according to a first format, the container file including or referring to at least two media data units;
including in the container file a checksum derived from information on said one or more of said at least two media data units;
obtaining or generating a metadata item according to a second format different from the first format, wherein the metadata item is valid for one or more of said at least two media data units according to the checksum, the container file including or referring to the metadata item;
including in the container file scope information indicating said one or more of said at least two media data units; and
including in the container file scope information additionally indicating types of information on said one or more of said at least two media data units used for deriving the checksum.

7. The method according to claim 6 , wherein the types of information comprise at least one of the following:
size of each of said one or more of said at least two media data units;
said one or more of said at least two media data units.

8. The method according to claim 6 , wherein the scope information comprises a sample group for associating said one or more of said at least two media data units with the metadata item.

9. An apparatus comprising at least one processor and at least one memory, said at least one memory stored with code thereon, which when executed by said at least one processor, causes an apparatus to perform at least the following:
obtain or generate a container file according to a first format, the container file including or referring to at least two media data units;
include in the container file a checksum derived from information on said one or more of said at least two media data units;
obtain or generate a metadata item according to a second format different from the first format, wherein the metadata item is valid for one or more of said at least two media data units, the container file including or referring to the metadata item according to the checksum;
include in the container file scope information indicating said one or more of said at least two media data units; and
include in the container file scope information additionally indicating types of information on said one or more of said at least two media data units used for deriving the checksum.

10. The apparatus according to claim 9 , wherein the types of information comprise at least one of the following:
size of each of said one or more of said at least two media data units;
said one or more of said at least two media data units.

11. The apparatus according to claim 9 , wherein the scope information comprises a sample group for associating said one

Assignees

• Nokia Technologies Oy

Inventors

• Malamal Vadakital Vinod Kumar
• Hannuksela Miska Matias

Classifications

• H04N21/85 Primary

  Assembly of content; Generation of multimedia applications · CPC title

• H04N21/234

  Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs · CPC title

• H04N21/44 Primary

  Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs · CPC title

• H04N21/44209

  Monitoring of downstream path of the transmission network originating from a server, e.g. bandwidth variations of a wireless network (arrangements for maintenance or administration in data switching networks involving bandwidth and capacity management H04L41/0896) · CPC title

• H04N21/85406

  involving a specific file format, e.g. MP4 format · CPC title