Processing media data structures

1. A method of playing out media from a media engine run on a receiving apparatus, the method comprising:

at the receiving apparatus, receiving a media data structure comprising media content formatted in a plurality of layers, including at least a first layer comprising the media content encoded according to a media encoding scheme, and a second layer encapsulating the encoded media content in one or more media containers according to a media container format;

identifying that the media engine is not capable of accessing the media container format of the second layer of the media data structure,

determining that at least one of said media containers further encapsulates runnable code for processing at least some of the formatting of the media data structure, wherein said processing comprises processing at least part of the formatting of the second layer in order to convert the media data structure into a second media container format which the media engine is capable of accessing, thereby supporting playout of the media content by the media engine;

running the runnable code on a code engine of the receiving apparatus in order to perform said processing at least some of the formatting of the media data structure for input to the media engine; and

inputting a processed version of the media data structure to the media engine in order to play out the media content.

2. The method of claim 1 , wherein said processing at least some of the formatting of the media data structure further comprises processing at least part of the formatting of the first layer.

3. The method of claim 2 , wherein the media engine comprises no decoder capable of decoding the media encoding scheme used in the media data structure; and wherein said processing at least part of the formatting of the first layer comprises either: decoding the media content for playout by the media engine, or transcoding the media content to a second media encoding scheme which the media engine is capable of decoding.

4. The method of claim 2 , wherein the media data structure comprises multiple audio streams or multiple video streams, and wherein said processing comprises multiplexing at least two of the multiple audio streams into a same audio stream for playout via a same audio buffer of the media engine, or multiplexing at least two of the multiple video streams into a same video stream for playout via a same video buffer of the media engine.

5. The method of claim 1 , wherein one or both of the code engine and media engine are incorporated in a web browser run on the receiving apparatus, or a plug-in to the web browser.

6. The method of claim 1 , wherein said media content is audio content and said media encoding scheme is an audio encoding scheme.

7. The method of claim 1 , wherein the media encoding scheme used in the media data structure is an ETSI standard or an MPEG standard.

8. The method of claim 6 , wherein the media encoding scheme used in the media data structure comprises one of: AC-4, AC-3, EAC-3, MPEG-4 AAC, MPEG-D USAC, or MPEG-H Audio.

9. The method of claim 1 , wherein the media container format is an ISO Base Media File Format.

10. The method of claim 1 , wherein the runnable code takes the form of JavaScript.

11. The method of claim 3 , wherein said media content is audio content and said media encoding scheme is an audio encoding scheme, and wherein the second media encoding scheme comprises one of: an AAC standard, MP3, Opus, or a PCM scheme.

12. The method of claim 1 , wherein the second media container format is MPEG-2 TS.